Usefulness of Computerized Objective Visual Acuity Test System Using Suppression Method.
10.3341/jkos.2008.49.7.1127
- Author:
Minseop KIM
1
;
Myung Kyoo KO
;
Jeong Min HWANG
;
Won Ryang WEE
;
Jin Hak LEE
Author Information
1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea. jjhlee@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Head-mounted-display;
Objective visual acuity test;
Objective system for visual acuity test (SOVAT);
Optokinetic nystagmus;
Suppression and induction method
- MeSH:
Eye Movements;
Humans;
Infant;
Nystagmus, Optokinetic;
Organothiophosphorus Compounds;
Reference Values;
Track and Field;
Visual Acuity
- From:Journal of the Korean Ophthalmological Society
2008;49(7):1127-1134
- CountryRepublic of Korea
- Language:Korean
-
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.
