Department of Orthoptics and Visual Science, Kitasato University School of Allied Health Sciences, 1-15-1 Kitasato, Sagamihara, Japan.
J Refract Surg. 2010 May;26(5):378-80. doi: 10.3928/1081597X-20100212-01.
To investigate the effect of pupil size on visual acuity in pseudophakic monovision.
For the simulation, a modified Liou-Brennan model eye was used. The model eye was designed to include a centered optical system, corneal asphericity, an iris pupil, a Stiles-Crawford effect, an intraocular lens, and chromatic aberration. Calculation of the modulation transfer function (MTF) was performed with ZEMAX software. Visual acuity was estimated from the MTF and the retinal threshold curve. The sizes of the entrance pupil were 2.0, 2.5, 3.0, and 4.0 mm.
Decreasing pupil diameter and increasing myopia progressively improved near visual acuity. For an entrance pupil size of 2.5 mm and a refractive error of -1.50 diopters, the logMAR value (Snellen; metric) in the non-dominant eye at 40 cm was 0.06 (20/23; 6/6.9).
Knowledge of the patient's pupil diameter at near fixation can assist surgeons in determining the optimum degree of myopia for successful monovision.
研究瞳孔大小对人工晶状体眼单眼视近视力的影响。
采用改良的 Liou-Brennan 模型眼进行模拟。该模型眼设计包括一个位于中心的光学系统、角膜非球面性、虹膜瞳孔、Stiles-Crawford 效应、人工晶状体和色差。使用 ZEMAX 软件计算调制传递函数（MTF）。通过 MTF 和视网膜阈值曲线来估计视力。入口瞳孔的大小分别为 2.0、2.5、3.0 和 4.0mm。
随着瞳孔直径的减小和近视程度的增加，近视力逐渐提高。对于入口瞳孔大小为 2.5mm 和-1.50 屈光度的近视，40cm 处非主导眼的 logMAR 值（Snellen；公制）为 0.06（20/23；6/6.9）。
了解患者近距注视时的瞳孔直径可以帮助外科医生确定成功单眼视所需的最佳近视度数。
