Comparison of Snellen acuity, VER acuity, and Arden grating scores in macular and optic nerve diseases.

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Abstract
Patients with various macular and optic nerve abnormalities underwent Snellen acuity, transient VER [visual evoked response] acuity and Arden grating testing. Snellen acuity was the coarsest of the 3 evaluations, generally falling after Arden scores and VER acuity had already undergone significant degradation. The Arden gratings are apparently the most sensitive of the 3 tests, equalling VER performance in optic nerve diseases and surpassing it in macular diseases. Variations between the different tests are understandable if the functions tested by each and the anatomical derangements caused by the diseases in question are considered. The Arden grating test is apparently an excellent and sensitive screening test for central visual disturbances.