목적: 본 연구에서는 머리에 착용하는 개인용 휴대 디스플레이(Head-mounted-display; HMD), 안진운동 측정프로그램, 안구감시장치 및 자극의 종류로서 억제법을 사용한 시스템을 개발하여 객관적 시력측정방법으로서의 유효성을 알아보고자 하였다. 대상과 방법: 시자극 발생장치, 고해상도 HMD, 적외선 카메라를 사용한 영상분석장치 및 안구감시장치 등으로 구성되는 객관적 시력검사기구를 사용하고 안진이 유발되는 시점을 파악하는 유발법을 이용한 시력검사와 안진을 유발시킨 후에 억제되는 시점을 파악하는 억제법을 이용한 시력검사를 주관적 시력과 비교한다. 결과: 유발법과 억제법으로 측정한 객관적 시력의 최소자극에 해당하는 주관적 시력은 유발법에서 3:0.35-0.6 (이하 객관적 시력 시표: 주관적 시력), 7:0.05～0.25, 12:0.05 이하이며 억제법에서 1:0.6～1.0, 1.5:0.4～0.7, 3:0.15～0.4, 5:0.1～0.2로 억제법이 유발법에 비해 변별력이 더 높게 나타났다. 결론: 억제법을 적용한 객관적 시력검사 시스템은 기존의 유발법보다 시력의 단계를 더 세분화 할 수 있어 객관적 시력을 평가함에 있어 보다 변별력 있는 유용한 검사방법이다.

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.

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.