Shortened Measurement Time of Functional Visual Acuity for Screening Visual Function

Yuki Hidaka; Sachiko Masui; Yasuyo Nishi; Masahiko Ayaki; Minako Kaido; Masaru Mimura; Kazuo Tsubota; Kazuno Negishi

doi:10.1155/2019/8950418

Shortened Measurement Time of Functional Visual Acuity for Screening Visual Function

J Ophthalmol. 2019 Sep 10:2019:8950418. doi: 10.1155/2019/8950418. eCollection 2019.

Authors

Yuki Hidaka¹, Sachiko Masui¹, Yasuyo Nishi¹, Masahiko Ayaki¹, Minako Kaido¹, Masaru Mimura², Kazuo Tsubota¹, Kazuno Negishi¹

Affiliations

¹ Department of Ophthalmology, Keio University School of Medicine, 35 Shinanomachi Shinjuku-ku, Tokyo, Japan.
² Department of Neuropsychiatry, Keio University School of Medicine, 35 Shinanomachi Shinjuku-ku, Tokyo, Japan.

Abstract

The functional visual acuity test which is the average of the visual acuities measured during a specific time frame (standard, 60 seconds) has been used recently to assess the visual function in various conditions. The availability of a shorter version of the functional visual acuity test promises to be patient friendly in that it is a simple screening test performed in a shorter period of time than the standard test. The results of measurements of the FVA test between the 30-second measurement time (short-version FVA test) and the standard 60-second measurement are compared, and the feasibility of the short-version FVA test instead of the standard FVA test is investigated. Twenty-eight healthy volunteers (25 men and 3 women) were enrolled in this prospective observational study. All subjects underwent measurement of the binocular distance-corrected visual acuity and the binocular distance-corrected FVA with the 60-second and 30-second measurement times. The interchangeability of the corrected-distance FVA, maximal VA, visual maintenance ratio, and average response time in the short-version and the standard FVA tests was evaluated using the Bland-Altman method, and the results showed agreements of the two tests except for the minimal VA. The short-version FVA test is equivalent to the standard method except for evaluating the visual acuity fluctuations and promises to be a simple visual screening test that can be performed in a shorter time.