Universidad de Valladolid, Departamento de Física Teórica, Atómica y Óptica, Paseo de Belén, 7 - Campus Miguel Delibes, 47011 Valladolid, Spain; Universidad de Valladolid, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Paseo de Belén, 17 - Campus Miguel Delibes, 47011 Valladolid, Spain; Optometry Research Group, IOBA Eye Institute, School of Optometry, University of Valladolid, 47011 Valladolid, Spain.
Universidad de Valladolid, Departamento de Física Teórica, Atómica y Óptica, Paseo de Belén, 7 - Campus Miguel Delibes, 47011 Valladolid, Spain; Universidad de Valladolid, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Paseo de Belén, 17 - Campus Miguel Delibes, 47011 Valladolid, Spain; Optometry Research Group, IOBA Eye Institute, School of Optometry, University of Valladolid, 47011 Valladolid, Spain.
Cont Lens Anterior Eye. 2018 Apr;41(2):169-174. doi: 10.1016/j.clae.2017.11.005. Epub 2017 Dec 6.
Presbyopic contact lens (CL) fittings produce simultaneous vision, providing different retinal images that reduce visual quality and wearers' satisfaction. The purpose of this study was to develop a new method to isolate the multifocality effect of different CL options to manage presbyopia, analysing the impact on binocular visual acuity (VA), stereopsis and contrast sensitivity (CS) and determining the effect of the use of a yellow filter (YF) on visual function.
A prospective and double-masked randomized pilot study involving 20 healthy volunteers was conducted. Four multifocal CLs and monovision CLs without far prescription were fitted. All subjects wore their spectacles over the CLs to guarantee optimum VA at distance. Binocular VA, stereopsis and CS were assessed after 20min of CL wear with or without a YF of 455nm.
Binocular VA decreased with all multifocal CLs (P<0.05), as did stereopsis (P<0.01). All presbyopia correction reduced CS compared with spectacles (P<0.05), except aspheric designs, at a frequency of 3 cycles/° (P>0.06). Using the YF, visual function improved; better binocular VA was found with all multifocal CLs (statistically significant (P<0.02) with both low-addition designs), and better CS was observed at most spatial frequencies (statistically significant (P<0.02) at low frequencies with all CLs).
This pilot study proposes a simple method to analyse the impact of multifocal CL wear on VA, stereopsis and CS while maintaining habitual spectacle correction to assess the patient's short-term opinion and help practitioners and patients make a decision during presbyopia correction with CL fitting.
老视隐形眼镜（CL）的适配会产生同时视，提供不同的视网膜像，降低视觉质量和佩戴者的满意度。本研究的目的是开发一种新方法来分离不同 CL 选择的多焦点效果，以管理老视，分析对双眼视力（VA）、立体视和对比敏感度（CS）的影响，并确定使用黄色滤光片（YF）对视觉功能的影响。
进行了一项前瞻性、双盲随机试点研究，涉及 20 名健康志愿者。适配了 4 种多焦点 CL 和没有远距处方的单视 CL。所有受试者都戴着眼镜在 CL 上，以保证在远距离有最佳的 VA。在佩戴 CL 20 分钟后，使用或不使用 455nm 的 YF 评估双眼 VA、立体视和 CS。
所有多焦点 CL 的双眼 VA 均下降（P<0.05），立体视也下降（P<0.01）。所有老视矫正均降低了与眼镜相比的 CS（P<0.05），除了非球面设计在 3 个/度（P>0.06）的频率。使用 YF，视觉功能得到改善；所有多焦点 CL 的双眼 VA 都有更好的发现（统计学上显著（P<0.02），具有低附加设计），并且在大多数空间频率观察到更好的 CS（统计学上显著（P<0.02），在所有 CL 中在低频）。
本试点研究提出了一种简单的方法来分析多焦点 CL 佩戴对 VA、立体视和 CS 的影响，同时保持习惯的眼镜矫正，以评估患者的短期意见，并帮助从业者和患者在 CL 适配期间做出决策。
