Purpose

To determine the impact of different central optical zone diameters (COZDs), obtained from pupil size, on the visual performance of presbyopic subjects fitted with centre-distance simultaneous-image multifocal contact lenses (SIMCLs).

Methods

Thirty-two presbyopic volunteers, between 45–58 years of age, participated in this prospective, controlled, double-blind study. Subjects were fitted with 5 centre-distance SIMCLs of variable COZD, determined from the measurement of pupil size under photopic light conditions and corresponding to 60, 70, 80, 90 and 100 % of pupil diameter. Subjects visual performance was evaluated through the measurement of distance, intermediate and near visual acuity (VA), “visual functional range” (VFR) obtained from the VA Defocus Curve (VADC) and Contrast Sensitivity Function (CSF), using a third-generation retina display iPad.

Results

Statistically significant differences were obtained for both distance (p = 0.01) and intermediate (p = 0.001) VA amongst designs. Best results were obtained with 80 % and 90 % COZDs compared to 60 %. No significant differences in VFR (p > 0.05) were obtained amongst the different COZDs. 90 and 100 % COZDs offered statistically significant better results at 6 and 18 cycles per degree (cpd) in the CSF, compared to the 60 and 70 % designs.

Conclusions

SIMCLs with COZDs of 80–90 % and of 90–100% of photopic pupil diameter offered better distance and intermediate VA, without a decline in near performance, and superior contrast sensitivity at medium and high spatial frequencies respectively, compared to lower COZD designs.

中文翻译：

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瞳孔大小-中心光学区直径关系对非球面多焦点隐形眼镜视觉性能的影响

目的

确定从瞳孔大小获得的不同中心光学区直径 (COZD) 对配备中心距同步图像多焦点隐形眼镜 (SIMCL) 的老花眼患者视觉表现的影响。

方法

32 名年龄在 45-58 岁之间的老花眼志愿者参与了这项前瞻性、对照、双盲研究。受试者配备了 5 个可变 COZD 的中心距 SIMCL，通过在明光条件下测量瞳孔大小并对应于瞳孔直径的 60、70、80、90 和 100% 确定。通过测量距离、中间和近处视力 (VA)、从 VA 散焦曲线 (VADC) 和对比敏感度函数 (CSF) 获得的“视觉功能范围” (VFR) 来评估受试者的视觉表现，使用第三代视网膜显示 iPad。

结果

设计之间的距离（p = 0.01）和中间（p = 0.001）VA都获得了统计学上的显着差异。与 60% 相比，使用 80% 和 90% 的 COZD 可获得最佳结果。在不同的 COZD 中，VFR 没有显着差异（p > 0.05）。与 60% 和 70% 的设计相比，90% 和 100% 的 COZD 在 CSF 中每度 6 和 18 个周期 (cpd) 提供了统计学上显着的更好结果。

结论

与较低的 COZD 设计相比，具有 80–90% 和 90–100% 的明视瞳孔直径的 COZD 的 SIMCL 提供了更好的距离和中等 VA，而近处性能没有下降，并且分别在中高空间频率下具有出色的对比敏感度。