| Description | For nearly forty years, Precision Vision has built a reputation of producing the most accurate and most durable vision testing tools available, including vision test charts for visual acuity measurement, ETDRS eye vision test charts, and more. We | This "revised" ETDRS chart incorporates a slight change in difficulty score for each of the ten Sloan optotypes. These difficulty levels were derived from the best corrected visual acuity examinations of 7,420 eyes during the ETDRS study. The | ETDRS vision charts were used during the first phase of the Early Treatment Diabetic Retinopathy Study and Visual Acuity Impairment Study. The use of ETDRS eye charts in these studies have validated their use and has lead to them become the |
| Features | Inquire | - For testing at 4 meters (13 ft.)
- Acuity range 40M to 2M (20/200, 6/60 to 20/10, 63 equiv.)
- Measures 62 X 65 cm (24.5 X 25.5 in.)
- Fits ETDRS Illuminator Cabinet CAT. NO. 2425
- Can also be wall-mounted
- Printed on high-impact polystyrene
| - For testing at 4 meters (13 ft.)
- Acuity range 40M to 2M (20/200, 6/60 to 20/10, 6/3 equiv.)
- Only standardized vision test accepted in studies sponsored by the National Eye Institute
- Designed for use in clinical studies and low vision evaluations where accurate, repeatable visual acuity measurements are required
- Lines are of equal difficulty
- Geometric progression in letter size from line to line
- Letter size is only variable
- Measures 62 X 65 cm (24.5 X 25.5 in.)
- Chart fits the ETDRS Illuminator Cabinet CAT. NO. 2425
- Can be wall-mounted
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