Laboratory of Optics and Vision (LOV), School of Medicine, University of Crete, Greece; Optometry & Vision Science Research Group, Aston University School of Life and Health Sciences, Birmingham, UK.
Laboratory of Optics and Vision (LOV), School of Medicine, University of Crete, Greece.
Cont Lens Anterior Eye. 2023 Aug;46(4):101853. doi: 10.1016/j.clae.2023.101853. Epub 2023 May 8.
Many activities of daily living rely on reading, thus is not surprising that complaints from presbyopes originate in reading difficulties rather in visual acuity. Here, the effectiveness of presbyopia correction with multifocal contact lenses (CLs) is evaluated using an eye-fixation based method of silent reading performance. ΜETHODS: Visual performance of thirty presbyopic volunteers (age: 50 ± 5 yrs) was assessed monocularly and binocularly following 15 days of wear of monthly disposable CLs (AIR OPTIX™ plus HydraGlyde™, Alcon Laboratories) with: (a) single vision (SV) lenses - uncorrected for near (b) aspheric multifocal (MF) CLs. LogMAR acuity was measured with ETDRS charts. Reading performance was evaluated using standard IReST paragraphs displayed on a screen (0.4 logMAR print size at 40 cm distance). Eye movements were monitored with an infrared eyetracker (Eye-Link II, SR Research Ltd). Data analysis included computation of reading speed, fixation duration, fixations per word and percentage of regressions.
Average reading speed was 250 ± 68 and 235 ± 70 wpm, binocularly and monocularly, with SV CLs, improving statistically significantly to 280 ± 67 (p = 0.002) and 260 ± 59 wpm (p = 0.01), respectively, with MF CLs. Moreover, fixation duration, fixations per word and ex-Gaussian parameter of fixation duration, μ, showed a statistically significant improvement when reading with MF CLs, with fixation duration exhibiting the stronger correlation (r = 0.79, p < 0.001) with improvement in reading speed. The correlation between improvement in VA and reading speed was moderate (r = 0.46, p = 0.016), as was the correlation between VA and any eye fixation parameter.
Average silent reading speed in a presbyopic population was found improved with MF compared to SV CL correction and was faster with binocular compared to monocular viewing: this was mainly due to the faster average fixation duration and the lower number of fixations. Evaluating reading performance using eye fixation analysis could offer a reliable outcome of functional vision in presbyopia correction.
日常生活中的许多活动都依赖于阅读，因此，远视患者抱怨的问题源于阅读困难而非视力。在此，我们通过基于眼动的默读表现评估了矫正老视的多焦点隐形眼镜（CL）的效果。
对 30 名远视志愿者（年龄：50±5 岁）进行单眼和双眼评估，在佩戴 15 天后使用月抛式隐形眼镜（Alcon Laboratories 的 AIR OPTIX plus HydraGlyde）：（a）单视（SV）镜片-不矫正近用；（b）非球面多焦点（MF）CL。使用 ETDRS 图表测量 logMAR 视力。通过在屏幕上显示标准 IReST 段落（40cm 距离时 0.4 logMAR 打印大小）来评估阅读性能。使用红外眼动追踪器（SR Research Ltd 的 Eye-Link II）监测眼球运动。数据分析包括计算阅读速度、注视持续时间、注视字数和回退百分比。
SV CL 双眼和单眼的平均阅读速度分别为 250±68 和 235±70 wpm，使用 MF CL 后，分别显著提高至 280±67（p=0.002）和 260±59 wpm（p=0.01）。此外，使用 MF CL 时，注视持续时间、注视字数和注视持续时间的外高斯参数μ均显示出统计学上的显著改善，其中注视持续时间的相关性更强（r=0.79，p<0.001），与阅读速度的改善呈正相关。VA 与阅读速度的相关性适中（r=0.46，p=0.016），VA 与任何眼动注视参数的相关性也是如此。
与 SV CL 矫正相比，多焦点隐形眼镜矫正可提高老视人群的平均默读速度，双眼比单眼更快：这主要是由于平均注视持续时间较快和注视次数较少。使用眼动分析评估阅读性能可以为老视矫正的功能性视力提供可靠的结果。
