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December 1976

Subjective and Objective Visual Acuity Testing Techniques

Author Affiliations

From the Department of Ophthalmology, University of Illinois Abraham Lincoln School of Medicine (Drs Khan and Frenkel), and the Department of Ophthalmology, Cook County Hospital (Dr Chen), Chicago.

Arch Ophthalmol. 1976;94(12):2086-2091. doi:10.1001/archopht.1976.03910040746009

• The Catford apparatus for determining the objective visual acuity was elevated with 20 normal (20 eyes) and 40 abnormal (75 diseased eyes) patients. The vision of the normal individuals was fogged with neutral-density filters and convex lenses. Eyes with normal or near normal vision showed good correlation between optokinetic response and visual acuity, but no correlation was observed in eyes with poor vision. These findings, which vary from those of Catford, indicate that objective methods of visual acuity testing using a nystagmoid response do not appear useful for general clinical purposes.