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Shortened Measurement Time of Functional Visual Acuity for Screening Visual Function.

Yuki Hidaka1, Sachiko Masui1, Yasuyo Nishi1

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

Journal of Ophthalmology
|October 5, 2019
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Summary

A new 30-second functional visual acuity test (FVA) is comparable to the standard 60-second version for assessing visual function. This shorter FVA test offers a patient-friendly alternative for rapid visual screening.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Clinical Measurement

Background:

  • Functional visual acuity (FVA) tests, averaging visual acuities over time, are used to evaluate visual function.
  • A standard FVA test typically uses a 60-second measurement period.
  • Shorter, patient-friendly screening tests are desirable for clinical efficiency.

Purpose of the Study:

  • To compare the results of a 30-second functional visual acuity test (short-version FVA) with the standard 60-second FVA test.
  • To investigate the feasibility of using the short-version FVA test as a substitute for the standard FVA test.
  • To evaluate the interchangeability of key FVA parameters between the short and standard versions.

Main Methods:

  • Prospective observational study involving 28 healthy volunteers.
  • Measurement of binocular distance-corrected visual acuity and FVA using both 30-second and 60-second time frames.
  • Bland-Altman analysis to assess the agreement and interchangeability of FVA parameters (corrected-distance FVA, maximal VA, visual maintenance ratio, average response time) between the two test durations.

Main Results:

  • The 30-second FVA test showed good agreement with the 60-second FVA test for most parameters, including corrected-distance FVA, maximal VA, visual maintenance ratio, and average response time.
  • The minimal VA parameter demonstrated a lack of agreement between the short-version and standard FVA tests.
  • The short-version FVA test is considered equivalent to the standard method for general visual acuity assessment, excluding fine-grained analysis of fluctuations.

Conclusions:

  • The 30-second functional visual acuity test is a viable and equivalent alternative to the standard 60-second test for assessing visual function.
  • The short-version FVA test provides a patient-friendly and time-efficient screening method.
  • While suitable for general assessment, the short-version FVA may not fully capture visual acuity fluctuations compared to the standard test.