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Kim, Ko, Hwang, Wee, and Lee: Usefulness of Computerized Objective Visual Acuity Test System Using Suppression Method
Original Article

J Korean Ophthalmol Soc 2008;49(7):1127-1134.

Published online: 7 September 2008

DOI: https://doi.org/10.3341/jkos.2008.49.7.1127

Usefulness of Computerized Objective Visual Acuity Test System Using Suppression Method

Minseop Kim, M.D.1, Myung-Kyoo Ko, M.D2, Jeong-Min Hwang, M.D.1, Won-Ryang Wee, M.D.1, Jin-Hak Lee, M.D.1,

Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea

Department of Ophthalmology, Hanyang University College of Medicine, Seoul, Korea

Address reprint requests to Jin-Hak Lee, M.D. Department of Ophthalmology, Seoul National University, College of Medicine #28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea Tel: 82-2-760-2438, Fax: 82-2-741-3187, E-mail: jjhlee@snu.ac.kr

Received 15 April 2008       Accepted 22 May 2007

Copyright © 2015 Korean Ophthalmological Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

The objective visual acuity test is mandatory in certain cases, such as infants, nonverbal subjects, and subjects who need legal assistance. We designed an objective system for visual acuity test (SOVAT) consisting of three components: stimuli applied via a suppression method, display and evaluation and made a suppression method as stimuli component for SOVAT. Usefulness of the SOVAT was evaluated.

Methods

The visual stimuli were presented on a high-resolution head-mounted display (HMD). An eye movement tracking program and gaze monitoring device allowed us to monitor the patient's fixation status during the test. The suppression method, in addition to a conventional induction method, was developed to use with the SOVAT and its accuracy and confidence level were evaluated.

Results

On the basis of clinical data, we present the reference values for the SOVAT as below. For the induction method, objective visual acuity (smallest pixel size), the presumed subjective visual acuity was 3: 0.35-0.6, 7: 0.05-0.25, 12: below 0.05 and for the suppression method it was 1: 0.6-1.0, 1.5: 0.4-0.7, 3: 0.15-0.4, 5: 0.1-0.2.

Conclusions

SOVAT using this suppression method to assess objective visual acuity proved to be more useful than that with a conventional induction method, especially in the range of high visual acuity.

Keywords: Head-mounted-display, Objective visual acuity test, Objective system for visual acuity test (SOVAT), Optokinetic nystagmus, Suppression and induction method

References

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Figure 1.
Head fixation device attached to head-mounted- display and CCD camera.
jkos-49-1127f1.tif
Figure 2.
The whole elements of objective visual acuity test system.
jkos-49-1127f2.tif
Figure 3.
Stimulation stripe pattern in induction method.
jkos-49-1127f3.tif
Figure 4.
Central suppression pattern on stimulation stripes in suppression method.
jkos-49-1127f4.tif
Figure 5.
Relative size of central suppression pattern in suppression method.
jkos-49-1127f5.tif
Figure 6.
The objective visual acuity (horizontal) versus subjective visual acuity (vertical) in suppression method.
jkos-49-1127f6.tif
Figure 7.
The correlation of objective visual acuity and subjective visual acuity in suppression method.
jkos-49-1127f7.tif
Figure 8.
The objective visual acuity (horizontal) versus subjective visual acuity (vertical) in induction method.
jkos-49-1127f8.tif
Figure 9.
The correlation of objective visual acuity and subjective visual acuity in induction method.
jkos-49-1127f9.tif
Table 1.
Correlation Analysis of objective visual acuity versus subjective visual acuity in induction method and suppression method
Subjective VA* Objective VAIM† Objective VASM‡
Pearson Correlation 0.383 0.654
P value (sig. 2-tailed) p<0.05 p<0.05
Number 145 141

* Visual acuity:

‡ Visual acuity of suppression method.

† Visual acuity of induction method;

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