Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Comparative Study
. 2014 Jul;58(4):381-7.
doi: 10.1007/s10384-014-0326-4. Epub 2014 May 29.

Repeatability of visual acuity testing using a psychometric function

Tomoki Tokutake  1 , Tomofusa Yamauchi, Norihiro Mita, Ken-ichiro Kawamoto, Hitoshi Tabuchi, Kazutaka Kani, Heihachiro Hara, Akio Tabuchi, Hiroshi Sasaki
Affiliations
Comparative Study

Repeatability of visual acuity testing using a psychometric function

Tomoki Tokutake et al. Jpn J Ophthalmol. 2014 Jul.

Abstract

Purpose: To evaluate the repeatability of a new method of measurement of visual acuity by use of a psychometric function.

Methods: The visual acuity of 15 healthy adults was measured by use of a psychometric function (PFVA) and by use of a conventional method using a decimal visual acuity chart (DeVA). We performed two tests. To evaluate intra-rater reliability, a tester measured the visual acuity three times for each subject, and the intraclass correlation coefficients, ICC (1,1), were calculated for PFVA and DeVA. Next, to evaluate inter-rater reliability, three testers measured the visual acuity for one subject, and the ICC (2,1) were calculated for PFVA and DeVA. The PFVA and DeVA of five subjects with ocular diseases were also measured.

Results: In the evaluation of intra-rater reliability, the ICC (1,1) of the DeVA was 0.83 and the ICC (1,1) of the PFVA was 0.95. In the evaluation of inter-rater reliability, the ICC (2,1) of the DeVA was 0.88 and the ICC (2,1) of the PFVA was 0.93. In both tests the standard deviations of the PFVA were significantly lower than those of the DeVA. For four of the five subjects with ocular diseases, the PFVA was significantly improved by treatment.

Conclusion: The repeatability of our method is better than that of the conventional method using a decimal visual acuity chart.

PubMed Disclaimer

References

    1. Invest Ophthalmol Vis Sci. 2006 Mar;47(3):1236-40 - PubMed
    1. Optom Vis Sci. 1995 Jun;72(6):371-7 - PubMed
    1. Int Ophthalmol. 1996-1997;20(5):231-9 - PubMed
    1. Psychol Bull. 1979 Mar;86(2):420-8 - PubMed
    1. Am J Ophthalmol. 2003 Feb;135(2):194-205 - PubMed

Publication types

LinkOut - more resources