• Central visual function is characteristically reported as Snellen acuity at distance and near. We performed functional tests in a group of patients with visual acuity of 20/100 or worse due to macular disease to determine whether there was a relationship between Snellen acuity and functional performance among these patients with poor visual acuity. Our tests of functional performance included currency discrimination, color recognition, reading a clock, and reading large print. Our results suggest that there is a correlation between Snellen acuity and functional vision, even among patients with poor visual acuity. Hence, therapeutic efforts to keep patients' visual acuity at 20/200 rather than 20/400, tor example, appears to be justifiable in that better acuity levels seem to be associated with improved functional performance.
Ebert EM, Fine AM, Markowitz J, Maguire MG, Starr JS, Fine SL. Functional Vision in Patients With Neovascular Maculopathy and Poor Visual Acuity. Arch Ophthalmol. 1986;104(7):1009–1012. doi:10.1001/archopht.1986.01050190067041
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