Arba Mosquera Samuel
SCHWIND eye-tech-solutions, Kleinostheim, Germany.
Eur J Ophthalmol. 2022 Oct 5:11206721221123883. doi: 10.1177/11206721221123883.
This article proposes a simple model that describes the quantitative relationship between visual acuity and defocus (as in defocus curves) in the presence of higher-order aberrations (HOA).
The basis model for describing the relationship between visual acuity and blur was taken from Blendowske as a starting point to develop an extended model applicable to defocus curves. The basis of Blendowskes's data is extended by incorporating effects induced by HOA. Aberrometric refractive errors are transformed into a single blur quantity b, also termed dioptric distance, which serves as an input in both models. The possible influence of the axes of asymmetric aberrations and the pupil size is not included.
The extended model has been used to generate reference data for a bi-aspheric multifocal correction profile for presbyopia. It provides reference data similar to what has been reported in the literature for that particular profile.
The model proposed in this article can be used to determine depth-of-focus effects associated with the presence of HOA. The extended model seems to provide a valid description for defocus curves. Actual uncertainties in experimental data on unaided visual acuity, especially the frequent lack of information on pupil diameter, prevent meaningful numerical comparison and the refinement of both models. However, theoretical arguments are provided in support of the extended model.
本文提出了一个简单模型，该模型描述了在存在高阶像差（HOA）的情况下视力与散焦（如散焦曲线中）之间的定量关系。
将描述视力与模糊关系的基础模型取自Blendowske作为起点，以开发适用于散焦曲线的扩展模型。通过纳入由HOA引起的效应来扩展Blendowskes数据的基础。像差屈光不正被转换为单个模糊量b，也称为屈光度距离，其在两个模型中均用作输入。不包括非对称像差轴和瞳孔大小的可能影响。
扩展模型已用于生成老花眼双非球面多焦点矫正轮廓的参考数据。它提供的参考数据与该特定轮廓在文献中报道的数据相似。
本文提出的模型可用于确定与HOA存在相关的焦深效应。扩展模型似乎为散焦曲线提供了有效的描述。裸眼视力实验数据中的实际不确定性，尤其是瞳孔直径信息的频繁缺失，妨碍了有意义的数值比较和两个模型的完善。然而，提供了理论论据来支持扩展模型。
