Torrents A, Gispets J, Pujol J
Departament d'Optica i Optometria, Universitat Politecnica de Catalunya Violinista Vellsola, Terrassa, Spain.
Ophthalmic Physiol Opt. 1997 Jul;17(4):357-66.
The double-pass method is applied to determine the optical image quality in monofocal contact lens (CL) wearers. This is an objective non-invasive technique that permits in vivo testing of the optical performance of CL wearers' eyes. Retinal image quality was measured for three subjects wearing two types of monofocal CLs: a rigid gas permeable (RGP) CL and a soft contact lens (SL), for pupil diameters of 3 mm and 5 mm. Results show the importance of ocular astigmatism regarding retinal image quality. In eyes presenting corneal astigmatism, the best results are obtained when wearing RGP CLs, because the lens compensates the corneal astigmatism. The modulation transfer function (MTF) is considerably smaller when no lens or soft lenses are worn, even for small amounts of astigmatism (0.5 D). When the astigmatism is corrected, the retinal image quality obtained with both types of CLs and with no lens is similar.
双程法用于测定单焦点隐形眼镜（CL）佩戴者的光学图像质量。这是一种客观的非侵入性技术，可对CL佩戴者眼睛的光学性能进行体内测试。对三名佩戴两种类型单焦点CL的受试者进行了视网膜图像质量测量：一种是硬性透气性（RGP）CL，另一种是软性隐形眼镜（SL），瞳孔直径分别为3毫米和5毫米。结果表明眼散光对视网膜图像质量的重要性。在存在角膜散光的眼睛中，佩戴RGP CL时可获得最佳结果，因为该镜片可补偿角膜散光。即使散光量较小（0.5 D），不戴镜片或戴软性镜片时调制传递函数（MTF）也会显著更小。当散光得到矫正时，两种类型的CL和不戴镜片时获得的视网膜图像质量相似。
