J Korean Ophthalmol Soc > Volume 61(2); 2020 > Article
Journal of the Korean Ophthalmological Society 2020;61(2):153-158.
DOI: https://doi.org/10.3341/jkos.2020.61.2.153    Published online February 15, 2020.
Measuring Defocus Curves of Monofocal, Multifocal and Extended Depth-of-focus Intraocular Lenses Using Optical Bench Test.
Yong Ho Koo, Chang Su Lee, Jin Soo Kim, Min Chul Shin, Eun Chul Kim, Man Soo Kim, Ho Sik Hwang
1Department of Ophthalmology, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
2Department of Electronic Engineering, College of Engineering, The University of Suwon, Hwaseong, Korea.
3Department of Ophthalmology, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea.
4Department of Ophthalmology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5Department of Ophthalmology, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea. huanghs@hanmail.net
광학벤치 실험을 통한 단초점, 다초점, 연속초점인공수정체의 탈초점곡선 측정
구용호1 · 이창수2 · 김진수1 · 신민철1 · 김은철3 · 김만수4 · 황호식5
한림대학교 의과대학 춘천성심병원 안과학교실1, 수원대학교 공과대학 전자공학과2, 가톨릭대학교 의과대학 부천성모병원 안과학교실3, 가톨릭대학교 의과대학 서울성모병원 안과학교실4, 가톨릭대학교 의과대학 여의도성모병원 안과학교실5
Correspondence:  Ho Sik Hwang,
Email: huanghs@hanmail.net
Received: 23 September 2019   • Revised: 14 October 2019   • Accepted: 22 January 2020
Abstract
PURPOSE
To determine the through-focus optical bench test performance of monofocal, bifocal, and extended depth-of-focus intraocular lenses (IOLs), and to measure their defocus curves. METHODS: A model eye was placed on an optical bench to test three different IOLs (TECNIS ZXR00, ZMB00, and ZCB00; Abbott Medical Optics, Santa Ana, CA, USA). The focus was changed by inserting trial lenses from +1.00 diopters to −4.00 diopters, in increments of +0.25 diopters. The 1951 United States Air Force Resolution chart was used to determine the quality of the images. The degree of similarity with reference images was given by the cross-correlation coefficient, and defocus curves were drawn and compared. RESULTS: Bifocal IOLs showed lower image quality with the addition of minus diopter trial lenses, but showed good image quality at near distance. Bifocal IOLs also showed a ‘double peak’ in their defocus curve. Monofocal IOLs showed a lower image quality and cross-correlation coefficient with addition of lower-diopter trial lenses. The extended depth of focus IOLs showed a single peak in their defocus curve, but had a wider range of diopters and better image quality than monofocal IOLs. CONCLUSIONS: Bifocal IOLs showed a double peak defocus curve, and extended depth of focus IOLs showed a wider diopter range and better image quality than monofocal IOLs.
Key Words: Bifocal;Defocus curve;Extended depth of focus;Optical bench test


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