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Small-aperture intraocular lens tolerance to induced astigmatism

机译：小孔人工晶状体对散光的耐受性

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Purpose: This prospective, single-site study aimed to assess the corresponding change in monocular visual acuity with induced astigmatic defocus in subjects implanted with a small-aperture intraocular lens (IOL). Patients and methods: Ten subjects with a mean age of 65.1 years were recruited. Eleven eyes of these 10 subjects were implanted (9 unilaterally, 1 bilaterally) with an IC-8 small-aperture IOL. Baseline manifest refraction and best-corrected distance visual acuity were measured with a Snellen chart (Tumbling E chart). Astigmatic defocus was induced in the same axis as the manifest sphere-cylinder refraction or at 180° for a spherical refraction. Cylinder defocus was reduced in 0.50 D steps from -2.50 D, and distance visual acuity was measured at each level of defocus. Results: Mean distance visual acuity was 0.08 logarithm of minimum angle of resolution (logMAR) ±0.08 (20/24) at 1.50 D of defocus, 0.18 logMAR ±0.08 (20/30) at 2.00 D of defocus, and 0.24 logMAR ±0.07 (20/35) at 2.50 D of defocus. Eight out of 10 subjects achieved 20/25 or better vision with 1.50 D of cylinder defocus, and all subjects were 20/30 or better. Ten out of 11 subjects were 20/40 or better with 2.50 D of defocus. Conclusion: The IC-8 IOL shows good tolerance to astigmatic defocus with minimal effect on visual acuity. Overall, 20/25 or better distance acuity was maintained through 1.50 D cylinder defocus.
机译：目的：这项前瞻性，单点研究旨在评估在植入小孔人工晶状体（IOL）的受试者中单眼视力引起的散光散焦的相应变化。患者和方法：招募了十名平均年龄为65.1岁的受试者。在这10名受试者的11眼中（单侧9眼，双侧1眼）植入了IC-8小孔IOL。用Snellen图（翻滚E图）测量基线明显屈光度和最佳矫正远视力。散光散焦是在与明显的球面柱面折射相同的轴上或在180°的球面折射上引起的。圆柱散焦从-2.50 D减少了0.50 D步长，并且在每个散焦水平下都测量了远距离视敏度。结果：散焦1.50 D时的平均远距视力为最小分辨角（logMAR）±0.08的对数±0.08（20/24），散焦2.00 D时为0.18 logMAR±0.08（20/30）和0.24 logMAR±0.07 （20/35）在2.50 D散焦。 10名受试者中有8名在散焦为1.50 D时达到20/25或更好的视力，所有受试者的视力都为20/30或更好。 11名受试者中有10名是20/40或更高，散焦为2.50D。结论：IC-8 IOL对散光散焦显示出良好的耐受性，对视敏度的影响最小。总体而言，通过1.50 D气缸散焦可以保持20/25或更佳的距离视力。

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