This revised eye chart incorporates a slight change in the difficulty score for each of the ten SLOAN letters derived from the best corrected visual acuity examinations of 7,420 eyes during the ETDRS study.
The revised arrangement of letters in the 2000 Series ETDRS chart resulted in the ultimate homogeneity and balance of the visual acuity test.
Can be wall mounted
2000 series revised ETDRS charts fit in ETDRS Illuminator Cabinet CAT. NO. 2425. This Illuminator cabinet provides a consistent and uniform light source behind the ETDRS visual acuity test. A glare source CAT. NO. 2429 may also be used for more intense visual acuity testing using different lighting situations.