Measuring Defocus Curves of Monofocal, Multifocal and Extended Depth-of-focus Intraocular Lenses Using Optical Bench Test
10.3341/jkos.2020.61.2.153
- Author:
Yong Ho KOO
1
;
Chang Su LEE
;
Jin Soo KIM
;
Min Chul SHIN
;
Eun Chul KIM
;
Man Soo KIM
;
Ho Sik HWANG
Author Information
1. Department of Ophthalmology, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
- Publication Type:Original Article
- Keywords:
Bifocal;
Defocus curve;
Extended depth of focus;
Optical bench test
- MeSH:
Lenses, Intraocular;
United States
- From:Journal of the Korean Ophthalmological Society
2020;61(2):153-158
- CountryRepublic of Korea
- Language:Korean
-
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.
