Clinical visual acuity is determined automatically with a staircase method, suggesting potential for efficient optometric exams.
A computer‐based automatic method for clinical visual acuity determinations is described. The procedure employs the staircase method of threshold determination using Landolt C's, and has been tested on 14 subjects representative of normal optometry clinic patients. Though more precise due to small step size, the results show fair agreement with manual determinations performed at the same time using the Snellen chart. The automatic method required more time because (1) subjects used 4 instead of 26 response alternatives, and (2) a mean step size of 1.15:1 instead of 1.5 or 2:1 was used. While most series of repeated automatic determinations were stable a few subjects showed improvement or deterioration apparently due to practice or fatigue respectively. Economic aspects of computer assistance for optometric examinations are briefly discussed and attention is drawn to the potential value of time‐sharing and remote operation.
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Crossman et al. (1970) studied this question.
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