Shortened Measurement Time of Functional Visual Acuity for Screening Visual Function

Figure 1

The functional visual acuity (FVA) measurement system and results of typical cases. (a) The FVA measurement system. (b) A representative printout of the results of the FVA test using the standard method. The blue line denotes the Landolt corrected visual acuity. The red line shows the timewise changes in the visual acuity during testing. The green line denotes the mean logarithm of the minimum angle of resolution (logMAR) visual acuity during the measurement (defined as the FVA). The yellow circles indicate the number of correct responses; the blue triangles indicate spontaneous blinks. FVA (logMAR), −0.09; visual maintenance ratio, 0.95; and maximal/minimal logMAR visual acuities, −0.18/0.10, respectively; average response time, 1.39 seconds. (c) A representative printout of the results of the FVA test using the short-version method in the same subject as in B FVA (logMAR), −0.10; visual maintenance ratio, 0.95; maximal/minimal logMAR visual acuities, −0.18/0.00, respectively; average response time, 1.30 seconds.

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