J Korean Ophthalmol Soc > Volume 61(2); 2020 > Article
Journal of the Korean Ophthalmological Society 2020;61(2):175-182.
DOI: https://doi.org/10.3341/jkos.2020.61.2.175    Published online February 15, 2020.
A Novel Method for Hyperacuity Measurement.
Jin Ha Kim, Key Hwan Lim, Yun Taek Kim
1Department of Ophthalmology, Ewha Womans University College of Medicine, Seoul, Korea.
2Cheonan Kim's Eye Clinic, Cheonan, Korea. jjongofhim@hanmail.com
초시력 측정의 새로운 방법
김진하1 · 임기환1 · 김윤택2
이화여자대학교 의과대학 안과학교실1, 천안김안과2
Correspondence:  Yun Taek Kim,
Email: jjongofhim@hanmail.com
Received: 2 September 2019   • Revised: 24 October 2019   • Accepted: 17 January 2020
Abstract
PURPOSE
We developed a novel method for measurement of hyperacuity and verified the utility thereof. METHODS: We developed a three-dimensional (3D) hyperacuity test using a 3D liquid crystal flat screen, a left- and right-image polarized display, and liquid crystal shutter glasses. We tested the technique in three groups: normal (n = 48), with cataracts (n = 14), and with macular disease (n = 35). We used a chart consisting of five dots and a reference line. Of the five dots, one was variably shifted from the other dots. A chart was presented to one eye and the reference line or blank image to the other eye; a subject scored positive when the dot in the unusual position was recognized. RESULTS: Hyperacuity was measured in terms of the reference line seen by the reference eye (RR), a blank image seen by the reference eye (RB), the reference line seen by the contralateral eye (CR), and a blank image seen by the contralateral eye (CB). All test scores were significantly lower when the reference line was seen than not (RR vs. RB and CR vs. CB; p < 0.01, respectively). For the RR and CR tests, no significant difference was apparent between the normal and cataracts group (p = 0.553, p = 0.494) but such differences were evident between the normal and macular disease groups (p = 0.028, p = 0.002). Also, visualization of the reference line by the reference and contralateral eyes did not differ (p > 0.05). CONCLUSIONS: Measurement of hyperacuity using our new method was not affected by media opacity but was significantly affected by macular disease. Presentation of a reference line facilitated hyperacuity assessment.
Key Words: Hyperacuity;Vernier acuity;3-Dimensional hyperacuity test


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