Light Reflection from the Intraocular Lens and a Way to Reduce It. Theoretical Study

Abstract

The purposeof the study was to examine the effect of the intraocular lens (IOL) position in the probability of occurrence of the phenomenon of light reflection from its surface and to justify the method of its reduction from the standpoint of the optics laws and eye anatomical parameters.Methods.Based on the laws of physical optics, the reflection of light from the surfaces of the IOL was calculated. The phenomenon of light reflection from the IOL was analyzed, in particular, influence such factors as the lens position in the eye and pupil diameter on its occurrence.Results.It was found that with increasing of distance from the iris to posterior chamber IOL, the angle of appearance of the phenomenon of light reflection from the lens decreases significantly, with the most significant change (angle narrowing from 80° to 19°, i.e., 4.21 times) with increasing of the distance from 1 to 3 mm, which is quite achievable at the present stage of intraocular correction. It was shown that the pupil diameter is less influences by appearance of the phenomenon of light reflection from the lens: it is significant only at a minimum distance from the iris to the IOL (the position of the standard posterior chamber IOL) and insignificant when the IOL is removed from the iris. The obtained results demonstrate the optimality of the method for preventing the appearance of the phenomenon of light reflection from the IOL by removing the intraocular lens from the iris at a distance corresponding to the position of posterior capsule of native lens.Conclusions.In this study, on the basis of the laws of physical optics and mathematical calculations, the leading role of such factor as the IOL position in the eye in appearance and intensity of the phenomenon of light reflection from the lens is substantiated for the first time. The proposed method for reducing the appearance of the phenomenon of light reflection from the IOL, which manifests itself in the form of glare in the eye, visible to others, on the basis of increasing the distance from the iris to the IOL is the optimal solution to the important problem of improving the quality of life of patients with pseudophakia.