Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain.
J Cataract Refract Surg. 2012 Feb;38(2):270-7. doi: 10.1016/j.jcrs.2011.07.040. Epub 2011 Dec 16.
To determine the optimum position to center a small-aperture corneal inlay and the effect of residual defocus in the surgical eye to maximize depth of focus.
Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain.
Cohort study.
Personalized eye models were built using actual data (corneal topography, eye length, ocular aberrations, and eye alignment). A small aperture 1.6 mm in diameter was placed at the corneal plane in each model. The monochromatic and polychromatic Strehl ratios were calculated as a function of the pinhole position. Different residual defocus values were also incorporated into the models, and the through-focus Strehl ratios were calculated.
Sixteen eye models were built. For most subjects, the optimum location of the aperture for distance vision was close to the corneal reflex position. For a given optimized centration of the aperture, the best compromise of depth of focus was obtained when the eyes had some residual myopic defocus (range -0.75 to -1.00 diopter [D]). Strehl ratio values were over 0.1 for far distance, which led to visual acuities better than 20/20. The depth of focus was 2.50 D with a mean near visual acuity of Jaeger 1 or better.
In eyes with little astigmatism and aberrations, the optimum centration of the small aperture was near the corneal reflex position. To improve optical outcomes with the inlay, some small residual myopia and correction of corneal astigmatism might be required.
确定小口径角膜嵌体的最佳中心位置以及手术眼残留离焦的影响，以最大限度地提高景深。
西班牙穆尔西亚大学光学实验室。
队列研究。
使用实际数据（角膜地形图、眼长、眼像差和眼球对准）构建个性化眼模型。在每个模型的角膜平面上放置一个直径为 1.6 毫米的小孔。计算单色和多色斯特列尔比作为针孔位置的函数。还将不同的残余离焦值纳入模型，并计算了聚焦斯特列尔比。
构建了 16 个眼模型。对于大多数受试者，用于远视力的孔径最佳位置接近角膜反射位置。对于给定的孔径优化中心位置，当眼睛有一些残余近视离焦（范围为-0.75 至-1.00 屈光度[D]）时，景深的最佳折衷方案。远距斯特列尔比值超过 0.1，导致视力优于 20/20。景深为 2.50 D，平均近视力为 Jaeger 1 或更好。
在散光和像差较小的眼中，小口径的最佳中心位置接近角膜反射位置。为了提高嵌体的光学效果，可能需要一些小的残余近视和矫正角膜散光。
