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(Research Report)Tj
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(The Jordy Electronic )Tj
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(Magnification Device: )Tj
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(Opinions, Observations, and )Tj
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(Barry Francis)Tj
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(The Jordy electronic magnification device is one of a )Tj
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(small number of electronic headborne devices designed )Tj
T*
(to provide people with low vision the capability to )Tj
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(perform near-range, intermediate-range, and distance )Tj
0 -1.3 TD
(viewing tasks. This report seeks to define the benefits )Tj
T*
(of using the Jordy as a low vision device by people )Tj
T*
(who are legally blind. The staff of the low vision )Tj
T*
(program of the Central Texas Veterans Health Care )Tj
0 -1.3 TD
(System in Waco, Texas, began using the Jordy )Tj
T*
(electronic magnification device, manufactured by )Tj
T*
(Enhanced Vision Systems \(EVS\) in 2000, when it was )Tj
T*
(still a boxlike structure, and have been using the latest )Tj
T*
(gogglelike model, with its improved focusing )Tj
0 -1.3 TD
(capability, since August 2003. The staff of the )Tj
0 -1.3 TD
(program, at a 15-bed facility that serves approximately )Tj
T*
(100 veterans a year in an inpatient vision rehabilitation )Tj
T*
(program, issued 27 Jordy units to clients from October )Tj
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(1, 2003 to October 1, 2004. In this article, I summarize )Tj
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(my observations of the design and serviceability of the )Tj
T*
(Jordy as a distance, intermediate-range, and near-)Tj
0 -1.3 TD
(vision device. I also include suggestions for improving )Tj
0 -1.3 TD
(the use of the Jordy.)Tj
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21.7 0 0 21.7 152.2 607.5664 Tm
(The physical unit)Tj
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18.2 0 0 18.2 152.2 564.9822 Tm
(EVS incorporated the Jordy camera and displays into a )Tj
0 -1.3 TD
(compact gogglelike structure that can be strapped on )Tj
T*
(one's head \(see )Tj
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(Figure 1)Tj
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(\). However, as small as the unit )Tj
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(is, its bulk and weight are the first considerations as to )Tj
T*
(whether it is an appropriate device for a particular )Tj
0 -1.3 TD
(person. As a general rule, the larger the user's head and )Tj
T*
(nose, the greater the comfort of using the Jordy as a )Tj
T*
(headborne device. Persons with smaller heads and )Tj
T*
(noses have problems with the Jordy displays sagging in )Tj
T*
(front of their eyes. EVS has an optional over-the-head )Tj
0 -1.3 TD
(elastic band to help with this problem, and it does help )Tj
T*
(to a point. Also, two styles of nosepieces are included )Tj
T*
(in the basic kit. The installed nosepiece can be adjusted )Tj
T*
(in and out to help with the sagging, but it does not )Tj
T*
(always hold in the adjusted position. Some persons )Tj
0 -1.3 TD
(with small heads have found that wearing a baseball )Tj
0 -1.3 TD
(cap turned backward with the Jordy placed on top )Tj
T*
(provides the support that is needed to eliminate the )Tj
T*
(sagging problem. Even for persons with large heads )Tj
T*
(and noses, the Jordy becomes weighty after it is worn )Tj
T*
(for an extended period.)Tj
0 -2.399 TD
(The Jordy has an autofocusing camera with 16 levels )Tj
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(of magnification. In its distance-lens setup, its focal )Tj
0 -1.3 TD
(ranges, measured from the plane of the face of the )Tj
T*
(Jordy to the target, are as noted in )Tj
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(Table 1)Tj
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(The Jordy's close-focus lens is available when )Tj
0 -1.3 TD
(magnification in the 8\22616 power level settings is )Tj
0 -1.3 TD
(required to perform near-range tasks. This lens is )Tj
T*
(attached to a distinctly prominent bar, which is located )Tj
T*
(on the right front face of the Jordy headset and can be )Tj
0 -1.3 TD
(located tactilely; when pushed to the left, the close-up )Tj
T*
(lens is engaged. For near-range activities that require )Tj
T*
(the use of the close-focus lens, the focal ranges, )Tj
T*
(measured from the plane of the face of the Jordy to the )Tj
T*
(target, are as noted in )Tj
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(Table 2)Tj
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(When it is set on the 16th power level, the Jordy has a )Tj
0 -1.3 TD
(zone of 27.5 centimeters to 98 centimeters \(about 11 )Tj
0 -1.3 TD
(inches to 39 inches\) in which it will not focus properly. )Tj
T*
(This dead zone shrinks as the magnification is reduced )Tj
T*
(to the 7th power level. At the 7th power level, the )Tj
0 -1.3 TD
(Jordy operates without the near-focus lens, and the )Tj
T*
(dead zone is no longer a problem.)Tj
0 -2.399 TD
(The Jordy has two rectangular-shaped electronic )Tj
0 -1.3 TD
(displays \(each measuring 18mm \327 28mm, or .071 )Tj
T*
(\327 .091 inch\) that are set up for binocular viewing. It )Tj
0 -1.3 TD
(can be worn with eyeglasses, which is helpful for )Tj
0 -1.3 TD
(persons with significant refractive errors. In addition, )Tj
T*
(persons with an extreme sensitivity to glare or )Tj
T*
(photophobia may wear tinted prescription eyeglasses )Tj
T*
(or sunglasses of their choice for glare control when )Tj
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(they use the Jordy.)Tj
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(The control unit\226battery pack buttons are of different )Tj
0 -1.3 TD
(sizes, shapes, and colors to help the user identify them )Tj
0 -1.3 TD
(both visually and tactilely. The molding and design of )Tj
T*
(the control pack are such that the button operations are )Tj
T*
(seldom accidentally activated by involuntary bumping )Tj
T*
(the buttons. The large Size control knob is easily )Tj
0 -1.3 TD
(located and adjusted. The Viewing Mode button is a )Tj
T*
(large round white button set next to the Size Control )Tj
T*
(knob. The Locator button is a large square button that )Tj
T*
(is located on the opposite side of the Size Control knob )Tj
T*
(from the Viewing Mode button. Two small ridgelike )Tj
0 -1.3 TD
(buttons increase or decrease the brightness of the )Tj
0 -1.3 TD
(image. The Power On/Off button and Focus Lock )Tj
T*
(button are small round buttons that are set next to each )Tj
T*
(other. The AC/DC input jack is visually identified by )Tj
T*
(its yellow color. The video In/Out jacks are tactilely )Tj
T*
(discriminated, since the In jack is set flush to the )Tj
T*
(housing and the Out jack is raised.)Tj
0 -2.399 TD
(Releasing and inserting the battery from the control )Tj
0 -1.3 TD
(unit require some instruction and practice but pose no )Tj
T*
(significant problems. Two-hour and four-hour )Tj
T*
(rechargeable batteries are available and serve the unit )Tj
0 -1.3 TD
(well. The battery charger is separate from the control )Tj
T*
(unit. The insertion and release of the battery from the )Tj
T*
(charger are similar to the release and insertion of the )Tj
T*
(battery from the control unit. The charger will not )Tj
T*
(overcharge the batteries.)Tj
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(The soft side shields that come with the unit are )Tj
0 -1.3 TD
(designed with three options for mounting. The user can )Tj
T*
(unfasten the buckle on the elastic headband and feed )Tj
0 -1.3 TD
(the loop of each side shield up the band and onto the )Tj
0 -1.3 TD
(temple piece or attach the side shield in either a high or )Tj
T*
(low position using the Velcro flaps. The user positions )Tj
T*
(the shields to block ambient light from the display )Tj
T*
(screens. However, even with optimum positioning, the )Tj
0 -1.3 TD
(shields do not screen out all ambient light from the )Tj
T*
(electronic displays. Therefore, users with a moderate-)Tj
T*
(to-severe reduction in contrast sensitivity may not be )Tj
T*
(able to use the Jordy effectively outdoors, particularly )Tj
T*
(on sunny days. Wearing a cap or hat to shield one's )Tj
0 -1.3 TD
(eyes from more light can help reduce the loss of image )Tj
0 -1.3 TD
(contrast on the electronic displays but does not )Tj
T*
(necessarily resolve the problem in outdoor settings.)Tj
0 -2.399 TD
(The belt clip is stout and reliably holds the control unit )Tj
0 -1.3 TD
(that is clipped to a belt. For persons who do not wear a )Tj
T*
(belt or for persons who have difficulty attaching the )Tj
T*
(belt clip because they have difficulty manipulating )Tj
T*
(objects with their hands, a fanny pack with an open )Tj
T*
(pocket that is worn around the waist is an alternative )Tj
T*
(way of transporting and gaining access to the control )Tj
T*
(unit. Also, it is easier to attach the belt clip to one's belt )Tj
0 -1.3 TD
(first and then engage the post of the belt clip in the clip.)Tj
0 -2.399 TD
(An AC/DC adapter, 12-foot video cable, 5-foot VCR )Tj
0 -1.3 TD
(cable, and cable coupler are provided with each Jordy )Tj
T*
(kit. These peripherals are dependable and provide the )Tj
T*
(optional capabilities for which they were intended. )Tj
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(Although the hard-shell briefcase-style case provides )Tj
0 -1.3 TD
(optimum protection when transporting the Jordy, it is )Tj
T*
(not the most convenient way for a user with low vision )Tj
0 -1.3 TD
(to carry the Jordy. A soft-shell, padded camera case )Tj
0 -1.3 TD
(with a shoulder strap, which can be purchased at a )Tj
T*
(department or camera store, is much more practical for )Tj
T*
(transporting the unit when traveling and using the unit )Tj
T*
(on a daily basis.)Tj
0 -2.399 TD
(The optional docking station \(X/Y viewing table\) )Tj
0 -1.3 TD
(enables the Jordy to be used as a side-by-side video )Tj
T*
(magnification system \(see )Tj
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(Figure 2)Tj
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(\). The headset drops )Tj
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(snugly into the holster over the docking station, and the )Tj
0 -1.3 TD
(control unit slides into its connection in a small tray at )Tj
0 -1.3 TD
(the rear of the X/Y table. The wire that connects the )Tj
T*
(headset and control unit can be woven down a series of )Tj
T*
(fins on the back of the holster arm to hold the wire out )Tj
T*
(of the way. The docking station has an attached power )Tj
T*
(cable that leads to an electrical wall outlet and a video )Tj
0 -1.3 TD
(cable that runs to a television monitor. When the )Tj
T*
(control unit is installed in the connection tray of the )Tj
T*
(docking station, the Jordy operates on electrical power, )Tj
T*
(and its image is displayed on the adjoining television )Tj
T*
(monitor. Fluorescent lights are mounted on either side )Tj
0 -1.3 TD
(of the holster to illuminate reading materials that are )Tj
0 -1.3 TD
(placed on the X/Y tray table. A separate On/Off switch )Tj
T*
(for the lights is located at the base of the support arm )Tj
T*
(of the headset holster. The X/Y tray table is large and )Tj
T*
(easily holds large books or magazines. The tray table )Tj
T*
(moves smoothly in all directions. There is no friction )Tj
T*
(brake for the in-and-out movement of the tray table. A )Tj
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(locking mechanism at the center front of the tray table )Tj
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(allows the tray table to be locked in a fixed position. )Tj
T*
(The design of the docking station is well thought out )Tj
0 -1.3 TD
(and allows the Jordy to serve as a serviceable side-by-)Tj
0 -1.3 TD
(side video magnification system.)Tj
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(Magnification ratings)Tj
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(I have not rated the Jordy's magnification capabilities, )Tj
0 -1.3 TD
(but have made some general observations about its )Tj
T*
(magnification performance. For example, a person )Tj
0 -1.3 TD
(with macular degeneration whose distance acuity is )Tj
0 -1.3 TD
(10/200 achieves an improved acuity of 10/30 with the )Tj
T*
(optical device 7 \327 30 Beecher headborne binoculars, )Tj
T*
(and will generally gain improved distance acuity by )Tj
T*
(one or two lines to either 10/25 or 10/20 when he or )Tj
0 -1.3 TD
(she properly uses the Jordy. Thus, the distance-)Tj
T*
(magnification capability of the Jordy is similar to the )Tj
T*
(distance magnification of a conventional 8x or 10x )Tj
T*
(telescope.)Tj
0 -2.399 TD
(The Jordy's magnification rating for near-range tasks is )Tj
0 -1.3 TD
(even more difficult to define. Often, a person with )Tj
T*
(macular degeneration and 10/100 distance acuity will )Tj
T*
(read 0.8M size letters on a near-acuity card with the )Tj
T*
(Jordy using power levels 3\2267 simply by holding the )Tj
T*
(card close to the face of the Jordy. The person's acuity )Tj
T*
(performance may then decline as the person shifts the )Tj
T*
(Jordy to power levels 8\22612 when the close-focus lens )Tj
T*
(is engaged, and the near-acuity card must be held at a )Tj
T*
(greater working distance from the Jordy's face. The )Tj
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(same person is usually able to read 0.5M letters on the )Tj
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(near-acuity card in the range of power levels 12\22616 at )Tj
T*
(a working distance of 26 centimeters \(about 10 inches\).)Tj
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(Distance viewing and )Tj
0 -1.2 TD
(intermediate-range activities)Tj
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(The Jordy's 16 levels of magnification provide )Tj
0 -1.3 TD
(advantages over conventional optical devices of fixed )Tj
T*
(magnification for viewing plays, concerts, and sporting )Tj
0 -1.3 TD
(events, as well as presentations at school and in the )Tj
0 -1.3 TD
(community and museum exhibits. The magnification )Tj
T*
(can be adjusted to accommodate the distance from the )Tj
T*
(viewer to the point of interest. If the viewer wants to )Tj
T*
(see a broader field of view, he or she lowers the )Tj
0 -1.3 TD
(magnification. If the viewer wants to see more detail in )Tj
T*
(a certain aspect of the performance or presentation, he )Tj
T*
(or she increases the magnification. The brightness )Tj
T*
(controls allow the user to adjust the screen image on )Tj
T*
(the headset for optimum viewing in all indoor lighting )Tj
0 -1.3 TD
(situations. The Locator button allows the user to pull )Tj
0 -1.3 TD
(down the magnification long enough to expand the )Tj
T*
(field of view, locate the target, center on it, and release )Tj
T*
(the Locator button to zoom back to the set )Tj
T*
(magnification level. The primary weaknesses in using )Tj
T*
(the Jordy to address these goals are the loss of image )Tj
T*
(contrast on the display screens in bright outdoor )Tj
T*
(conditions and the viewer's tolerance for the weight of )Tj
T*
(the Jordy. Conventional headborne optical devices are )Tj
T*
(lighter weight and provide a clearer image in outdoor )Tj
T*
(settings. Also, optical devices provide a clearer image )Tj
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(when the user views a video presentation on a )Tj
0 -1.3 TD
(television or computer monitor. However, conventional )Tj
T*
(headborne optical devices do not have the Jordy's )Tj
0 -1.3 TD
(variable magnification capability.)Tj
0 -2.399 TD
(The Jordy has potential benefits and limitations in )Tj
0 -1.3 TD
(shopping situations. When the Jordy is first turned on, )Tj
T*
(its setup screens warn against walking or driving with )Tj
0 -1.3 TD
(the Jordy. However, only persons with better acuity are )Tj
T*
(able to read these warnings. Therefore, users should be )Tj
T*
(informed of the danger of walking or driving with the )Tj
T*
(Jordy because of the distortions in size and distance )Tj
T*
(that occur with magnification. Thus, while shopping, )Tj
0 -1.3 TD
(the user needs to push the Jordy up on his or her )Tj
0 -1.3 TD
(forehead while walking about the store. When the user )Tj
T*
(wants to view an item with the Jordy, he or she needs )Tj
T*
(to stop, drop the Jordy in place, and begin viewing )Tj
T*
(while standing or sitting still. The user can scan an area )Tj
T*
(on lower magnification with the advantage of the )Tj
T*
(expanded field and zoom up to higher magnification to )Tj
T*
(read aisle signs, identify products on shelves, and read )Tj
T*
(price tags on the edges of shelves. Persons with 20/60 )Tj
T*
(to 20/200 acuity who have the visual capability to scan )Tj
T*
(and locate products with their unaided vision may do )Tj
T*
(better scanning aisles unaided and using a conventional )Tj
0 -1.3 TD
(optical telescopic device to read the aisle signs or price )Tj
T*
(tags on the edges of shelves. Persons with 20/200 or )Tj
T*
(poorer acuity who cannot scan and spot products well )Tj
T*
(unaided may do better using the Jordy on a lower )Tj
T*
(magnification setting to scan store areas and then zoom )Tj
T*
(up to higher magnification to read the aisle sign, )Tj
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(product name, or price tag on the edge of a shelf. Also, )Tj
0 -1.3 TD
(persons with 20/60 or poorer acuity with hand-)Tj
T*
(dexterity problems that prohibit them from holding a )Tj
0 -1.3 TD
(telescope steady or focusing a manually focused )Tj
0 -1.3 TD
(telescope may appreciate the autofocusing capability of )Tj
T*
(the Jordy and the steadiness of using it in a headborne )Tj
T*
(position. Persons who are skilled in using a handheld )Tj
T*
(telescope and pocket magnifier for shopping may )Tj
0 -1.3 TD
(prefer these devices to the Jordy, since they are less )Tj
T*
(cumbersome to carry and shop with than is the Jordy.)Tj
/TT1 1 Tf
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(Intermediate- and near-range )Tj
0 -1.2 TD
(activities)Tj
/TT2 1 Tf
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(Table games)Tj
/TT0 1 Tf
18.2 0 0 18.2 152.2 376.4222 Tm
(For the purpose of this discussion, I use the example of )Tj
0 -1.3 TD
(playing card games. At a typical card table, the player )Tj
T*
(needs to be able to see cards on the far side of the )Tj
0 -1.3 TD
(table, in the middle of the table, on the near side of the )Tj
0 -1.3 TD
(table, and in his or her hand. These distances vary )Tj
T*
(according to the size of the table and chair and the )Tj
T*
(height and weight of the card player. For this example, )Tj
T*
(I assigned the following viewing distances from the )Tj
0 -1.3 TD
(face of the Jordy to the location of the cards:)Tj
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(l)Tj
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( )Tj
18.2 0 0 18.2 192.2 144.3922 Tm
(the far side of the table = 110 centimeters \(about )Tj
0 -1.2 TD
(43 inches\) )Tj
/T1_1 1 Tf
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(l)Tj
/TT0 1 Tf
( )Tj
18.2 0 0 18.2 192.2 80.7122 Tm
(middle of the table = 85 centimeters \(about 33 )Tj
T*
(inches\) )Tj
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( )Tj
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(near side of the table = 57.5 centimeters \(about 23 )Tj
0 -1.2 TD
(inches\) )Tj
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(l)Tj
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( )Tj
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(the player's card hand, held at 35 centimeters )Tj
T*
(\(about 14 inches\) )Tj
-2.198 -2.349 Td
(The Jordy's first seven power levels focus easily from )Tj
0 -1.3 TD
(7.5 centimeters \(about 3 inches\) to infinity with the )Tj
T*
(distance-lens setup. Persons whose vision is good )Tj
T*
(enough to read the cards at a distance of 110 )Tj
T*
(centimeters using the seventh power level or less can )Tj
0 -1.3 TD
(set the power level that is needed to read the cards at )Tj
T*
(110 centimeters and read the cards at 85 centimeters, )Tj
T*
(57.5 centimeters, or 35 centimeters using the same )Tj
T*
(power level without any special focusing adjustments. )Tj
T*
(They can also reduce the power level for closer-range )Tj
T*
(viewing and increase the power level for longer-range )Tj
T*
(viewing without any special focusing adjustments as )Tj
T*
(long as they stay in the first seven power levels of )Tj
T*
(magnification. For persons with this type of visual )Tj
T*
(capability, using the Jordy is fairly simple and )Tj
T*
(straightforward. They need to set the brightness level )Tj
T*
(appropriately for the lighting conditions and be skilled )Tj
T*
(in spotting the cards at various distances.)Tj
0 -2.399 TD
(For persons who require more magnification than the )Tj
0 -1.3 TD
(first seven power levels to read the cards at the various )Tj
T*
(working distances, the focusing process and )Tj
T*
(adjustments are more complex. In the distance-lens )Tj
T*
(setup, with the Jordy set on the 16th power level, the )Tj
0 -1.3 TD
(maximum magnification, the closest point of clear )Tj
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(focus that the Jordy can achieve is 98 centimeters )Tj
0 -1.3 TD
(\(about 39 inches\). Those who require the 16th level of )Tj
T*
(magnification for reading the cards on the far side of )Tj
0 -1.3 TD
(the table at 110 centimeters will be able to do so )Tj
0 -1.3 TD
(without any special focusing adjustments. However, )Tj
T*
(when they attempt to read the cards at the other three )Tj
T*
(closer-range distances, they need to make size or )Tj
T*
(focusing adjustments or both. To read the cards in the )Tj
0 -1.3 TD
(middle of the table, at 85 centimeters, they either have )Tj
T*
(to shift back 13 centimeters \(about 5 inches\) to 98 )Tj
T*
(centimeters while using the 16th power level or stay at )Tj
T*
(the 85-centimeters distance and reduce the power )Tj
T*
(setting to the 12th power level. To read the cards at the )Tj
0 -1.3 TD
(near edge of the card table, the 57.5-centimeter range, )Tj
0 -1.3 TD
(they have either to shift the near-focus lens into )Tj
T*
(position and lean down to the focal range that is )Tj
T*
(required for the power needed to read the cards or )Tj
T*
(remain in the distance-lens setup in the 57.5-centimeter )Tj
T*
(range and reduce the magnification to the 9th power )Tj
T*
(level. Finally, to read the cards held in his or her hand )Tj
T*
(in the 35-centimeter range, a player either has to shift )Tj
T*
(the near-focus lens into position and bring the cards )Tj
T*
(into the focal range that is required for the power level )Tj
T*
(needed to read the cards or remain in the distance-lens )Tj
T*
(setup with the cards in the 35-centimeter range and )Tj
0 -1.3 TD
(reduce the magnification to the 7th power level. Those )Tj
T*
(who require this type of magnification are dealing with )Tj
T*
(the most-complex focusing processes. As the )Tj
T*
(magnification requirements lessen, the complexity of )Tj
T*
(focusing lessens.)Tj
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(In a card game in which the Jordy must be constantly )Tj
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(adjusted to read the cards at the four different focal )Tj
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(ranges, the player may find the game more of a tiring )Tj
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(visual exercise than a pleasant pastime. Spotting )Tj
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(targets at these ranges is more difficult than is spotting )Tj
T*
(targets at greater distances. The Locator button is )Tj
T*
(helpful for easing the spotting problem. Persons for )Tj
T*
(whom the Jordy would be issued for playing table )Tj
0 -1.3 TD
(games would need to have good spotting skills at close )Tj
T*
(range, a good understanding of the Jordy's focal )Tj
T*
(ranges, and good skills in using the Size and Locator )Tj
T*
(controls. By finding adaptive table-game equipment )Tj
T*
(and training the other participants with whom he or she )Tj
0 -1.3 TD
(is playing, the player can lessen the visual complexity )Tj
0 -1.3 TD
(of the game. In most cases, the Jordy is not issued )Tj
T*
(solely for playing table games, but, for persons who )Tj
T*
(have several goals for which the Jordy could be used, )Tj
T*
(the Jordy could meet some of their needs for playing )Tj
T*
(table games.)Tj
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(Reading in the headborne position)Tj
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(As with conventional low vision devices, the less )Tj
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(magnification required by persons with low vision who )Tj
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(use the Jordy for reading, the better the results will be. )Tj
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(As the magnification requirements increase, the focal-)Tj
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(range sensitivity increases, the area that is viewed on )Tj
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(the display screens decreases, and thus the difficulty of )Tj
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(maintains the material at a constant distance from the )Tj
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(reader, thus improving the focus. If the image )Tj
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(continues to shake or bounce, users will have to lean )Tj
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(steady their heads with their hands. The three black-)Tj
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(and-white mode settings provide improved contrast )Tj
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(and a clearer image when reading with the Jordy. The )Tj
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(low vision program in Waco has never issued a Jordy )Tj
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(to be worn as a headborne device as the primary )Tj
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(reading device for long-term reading tasks, such as )Tj
T*
(reading newspapers, magazines, or books. Persons who )Tj
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(can use the Jordy for reading on a lower magnification )Tj
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(setting can also use conventional optical devices for )Tj
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(reading and prefer them to the Jordy for comfort and )Tj
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(ease of use. Persons who require higher magnification )Tj
T*
(settings for reading with the Jordy prefer reading with )Tj
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(a more conventional video magnification device when )Tj
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(reading for extended periods.)Tj
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(Because the Jordy is portable, it can meet some short-)Tj
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(term reading needs, such as reading the directions on a )Tj
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(label. Even short-term reading tasks, however, may be )Tj
T*
(accomplished more quickly and easily using a simple )Tj
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(pocket magnifier or other optical device. However, the )Tj
T*
(Jordy does provide inverse video for enhancing the )Tj
0 -1.3 TD
(contrast of reading material, which is a distinct )Tj
T*
(advantage for some persons with poor contrast )Tj
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(sensitivity. Nevertheless, other portable electronic )Tj
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(magnification devices, such as the Pocket Viewer, )Tj
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(manufactured by HumanWare; QuickLook, )Tj
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(Compact, manufactured by Optelec USA, may be more )Tj
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(for reading in the headborne position, the Jordy is not )Tj
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(the device of choice in the majority of cases.)Tj
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(Reading in the docking station)Tj
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(As noted earlier, placed in its optional docking station )Tj
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(and used with an external monitor, the Jordy provides )Tj
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(the service of a good side-by-side video magnification )Tj
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(system. Its advantage over an in-line closed-circuit )Tj
0 -1.3 TD
(television system is the large open space between the )Tj
T*
(camera and the X/Y table. This open space allows for )Tj
T*
(easy movement of large volumes of reading materials )Tj
T*
(underneath the camera. Also, writing instruments and )Tj
0 -1.3 TD
(other tools can be easily maneuvered in this large open )Tj
T*
(space, allowing the user to perform writing tasks and )Tj
T*
(some simple handiwork tasks on the X/Y tray table )Tj
T*
(with no interference from a low-hanging camera )Tj
T*
(housing. The four Viewing Mode options\227full color, )Tj
0 -1.3 TD
(black and white, high-contrast black and white, and )Tj
0 -1.3 TD
(inverse black and white\227provide good-quality options )Tj
T*
(for reading, writing, and viewing photographs and )Tj
T*
(pictures. The system works well with good room )Tj
T*
(ambient lighting only or with the system's mounted )Tj
T*
(fluorescent lights. However, the location of the )Tj
T*
(system's lights causes severe glare with the display )Tj
T*
(image when reading materials that are printed on )Tj
T*
(glossy paper, such as magazines. If one turns off the )Tj
T*
(fluorescent lamps and relies on ambient lighting from )Tj
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(lamp, glare in the image display can be eliminated. )Tj
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(Since the system has a dark-colored X/Y tray table and )Tj
T*
(soft fluorescent illuminating lamps, there is no harsh )Tj
0 -1.3 TD
(glare from the surface of the X/Y table to bother the )Tj
0 -1.3 TD
(user. Because the system is a side-by-side system, )Tj
T*
(users who prefer to have their faces close to the )Tj
T*
(monitor have difficulty getting close to the monitor and )Tj
T*
(operating the X/Y table comfortably. Another )Tj
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(disadvantage is the location of the controls, which are )Tj
T*
(at the rear of the X/Y table. To turn the system on or )Tj
T*
(off, adjust the size, and change the viewing modes, the )Tj
T*
(user must make a fairly long and somewhat awkward )Tj
T*
(reach to the controls. The side-by-side presentation )Tj
0 -1.3 TD
(requires more desktop space, and a stand may be )Tj
0 -1.3 TD
(needed to raise the television monitor to a comfortable )Tj
T*
(viewing height. Finally, the Jordy's Brightness and )Tj
T*
(Contrast buttons do not control the display monitor's )Tj
T*
(image. Rather, the user must access the display )Tj
T*
(monitor's settings to change the brightness or contrast )Tj
T*
(of the display image.)Tj
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(Using the Jordy for handiwork activities)Tj
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(For the craftsperson or handiworker with a visual )Tj
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(acuity of 20/200 or poorer, the Jordy provides some )Tj
T*
(positive options for the higher magnification )Tj
0 -1.3 TD
(requirements needed to perform fine-detail tasks. )Tj
0 -1.3 TD
(Conventional optical devices, such as high-plus )Tj
T*
(aspheric spectacles or headband magnifiers, require too )Tj
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(close a working distance to perform many handiwork )Tj
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(optical telescopic devices with near-focus capability )Tj
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(have sensitive focal distances and limited fields of )Tj
T*
(view that hinder their use for handiwork activities.)Tj
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(Used in power levels 1\2267, the Jordy focuses at any )Tj
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(distance from 7.5 centimeters \(about 3 inches\) on out, )Tj
T*
(allowing users to position their work at a comfortable )Tj
T*
(distance while performing an activity. Persons who )Tj
0 -1.3 TD
(require the higher magnification of power levels 8\22616 )Tj
T*
(to perform a task engage the close-up lens and adjust )Tj
T*
(their working distance appropriately to work on the )Tj
T*
(fine-detail aspects of their task. As with conventional )Tj
T*
(optical devices, the higher magnification required of )Tj
0 -1.3 TD
(the Jordy, the more sensitive the focal distance )Tj
0 -1.3 TD
(required and the smaller the field of view. The Jordy's )Tj
T*
(variable magnification is a distinct advantage over the )Tj
T*
(set magnification levels of conventional devices. The )Tj
T*
(user can lower the Jordy's magnification and thus )Tj
T*
(expand the field of view and gain a better overall )Tj
T*
(perspective of the relationship of a task's individual )Tj
T*
(components to each other and then increase the )Tj
T*
(magnification as needed to deal with the finer details of )Tj
T*
(the task.)Tj
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(Users need to learn to use the Focus Lock feature for )Tj
0 -1.3 TD
(working on three-dimensional objects or moving tools )Tj
T*
(in and out of the field of view between the camera and )Tj
T*
(the desired point of focus. For instance, if they are )Tj
T*
(trying to focus on the point of a pyramid, the camera's )Tj
T*
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(is out of focus. Users can set the desired magnification, )Tj
0 -1.3 TD
(place a business card on the point of the pyramid, )Tj
T*
(allow the Jordy to focus on the business card, hit the )Tj
0 -1.3 TD
(Focus Lock, remove the card, and see the pinnacle of )Tj
0 -1.3 TD
(the pyramid in good focus. When the Focus Lock is )Tj
T*
(activated, the letters "FL" are supposed to appear in the )Tj
T*
(top left corner of the display screens. However, many )Tj
T*
(users with lower visual capabilities do not notice the )Tj
0 -1.3 TD
(letters in the display.)Tj
0 -2.399 TD
(When the Jordy is used in a headborne position, it is )Tj
0 -1.3 TD
(difficult to hold an object on which one is working at a )Tj
T*
(consistent distance from the face of the Jordy and to )Tj
T*
(hold one's head steady while viewing the object on )Tj
T*
(which one is working. Thus, the Jordy may lose focus, )Tj
T*
(or the viewer may have difficulty aligning on the target )Tj
T*
(and holding that alignment when trying to perform a )Tj
T*
(handiwork task. To make the Jordy more shop friendly, )Tj
T*
(the Waco staff has designed a boom arm to hold the )Tj
T*
(Jordy while the user views the magnified image on a )Tj
T*
(television display that is set to one side of the work )Tj
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(station \(see )Tj
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(view of the area of the task being performed. This )Tj
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(device for the veterans in the Waco low vision )Tj
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(program. EVS has shown no interest in providing a )Tj
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(The Clarity video magnification system with a boom )Tj
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(because it can be easily removed from the boom arm )Tj
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(and used in a headborne position for other tasks.)Tj
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(emotional impairments. The ratings address the use of )Tj
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(the program's issuance rate of the Jordy would be )Tj
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trailer
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