MTF based optimization design for customized human eye correction model

Abstract

On the basis of a customized human eye model, the invention designs an optimized ablation mode for a refractive surgery to correct out-of-focus, astigmatism and other aberrations, and belongs to the technical field of orthoptics of human eyes. The design uses actually-measured human eye wavefront aberrations, cornea characteristic parameters and axial spacing data of each part in eyes in construction of the customized human eye model, and acquires respectively MTF of a whole eye, the cornea and crystalline lens through the optimization function of Zemax software. The design acquires the customized visual function through correlation between the aberration and a contrast sensitivity function, designs the optimized customized ablation so as to acquire the optimized visual quality. The customized visual quality can better meet the requirement of an operative patient on visual quality.

Description

technical field [0001] The invention belongs to the technical field of vision correction. Background technique [0002] In recent years, with the continuous development of modern optometry theory and technology, excimer laser surgery, as a tool to correct the refractive error of the human eye, has attracted more and more attention. In previous refractive surgery, the corneal surface was used as a spherical model for cutting. For example, the shape cutting model described by Munnerlyn et al. is a "Sharp-subtraction" mode, which changes the shape of the naturally evolved cornea, thus affecting the visual quality. [0003] Studies have shown that PRK, LASIK, LASEK and other operations change the shape of the cornea due to laser ablation, making the human eye change from the original normal physiological state (Prolate asphericity) to a non-physiological state (Oblate central flat, edge steep), thus Cause a series of optical problems. In the research of Fabrice Manns et al., i...

AI Technical Summary

Problems solved by technology

Since the measurement of visual acuity and contrast sensitivity requires the subject's subjective participation and cannot truly reflect the visual quality, more sensitive and accurate evaluation methods are needed

As aberration is a tool to reflect the comprehensive effect of the eyes and the brain, all levels interact and influence each other. A single aberration data can no longer truly reflect the optical quality of the human eye, so an objective method is also needed

[0005] In addition, the previous refractive correction was mainly converted from the optometry method, without considering the wavefront aberration data of the individual human eye, so it was impossible to accurately calculate the corneal diopter and high-order image according to the specific characteristic parameters of the individual human eye. Poor, so that there is a certain error in the refractive surgery performed on the cornea, so a new refractive surgery method is needed

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