Vision Test Chart

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A Logmar chart or Bailey-Lovie chart or ETDRS chart (Early Treatment Diabetic Retinopathy Study) comprises rows of letters and is used by ophthalmologists, optometrists and vision scientists to estimate visual acuity.

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• Production Capacity: 20

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A contrast sensitivity test measures your ability to distinguish between finer and finer increments of light versus dark (contrast). This differs from common visual acuity testing in a routine eye exam, which measures your ability to recognize smaller and smaller letters on a standard eye chart.

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• Item Code: ASF-28
• Production Capacity: 50
• Delivery Time: Within 2 days

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The Snellen eye chart is the familiar chart with the big letter or symbol at the top and progressively smaller letters at the bottom of the chart down to 20/20 or better. This is a chart for measuring visual acuity at a distance - in other words, how well you can see things that are far away. Non-reflective matte finish · 20' distance · 22" x 11"

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Hess Chart (position)   The basic principle of Hess chart is foveal projection therefore the higher field belongs to the higher eye.  This is opposite of diplopia charting where the higher image is of the lower eye.  Position of the central dot indicates whether the deviation is in primary position or not.

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• Production Capacity: 20

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An eye chart is a chart used to measure visual acuity. Eye charts are often used by health care professionals, such as optometrists, physicians or nurses, to screen persons for vision impairment. Ophthalmologists, physicians who specialize in the eye, also use eye charts to monitor the visual acuity of their patients in response to various therapies such as medications or surgery Optometric Eye Chart.

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The normal Snellen chart is printed with eleven lines of block letters. A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific eye.

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In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc.

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• Production Capacity: 5000

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he Logmar Chart 2 Revised incorporates a slight change in the difficulty score for each of the ten Sloan letters derived from the best visual acuity examinations of 7420 eyes during the ETDRS study. The original charts difficulty scores were derived from the examination of 234 eyes. In addition to the revised arrangement of letters which resulted in the ultimate homogeneity of difficulty per line, the three charts are balanced so that in each chart the ten letters are represented at least once in every position. 

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• Production Capacity: 100

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The Teller Acuity Cards II can rapidly and reliably test visual acuity in infants and nonverbal patients, using preferential looking. Cards are digitally printed to increase accuracy and laminated to enhance durability.

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• Production Capacity: 100

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Features:

• Suitable for testing very small children (2 1/2 to 5) as well as adults
• TNO sterotest contains seven red/green test plates, presented in book form.
• In conjuction with red/green spectacles, the first three plates are used for screening.
• The quantitive plates (V - VI) enable stereoacuity between 480 and 60 seconds of arc.
• When used for screening purposes, Plate V should be used as a pass-fail criterion. Various studies (see references)
• indicate that at the level of 240 sec. of arc at least 95% of
• the amblyopes are unable to see the test figures.
• Kit includes seven plates and red/green glasses.

Additional Information:

• Item Code: ASF-PTS85
• Production Capacity: 50