About a dependence of retina luminosity and depth of eye sharpness on the artificial lens position. Theoretical rationale

Abstract

Purpose. Analysis of the influence of IOL position in the eye on parameters of retina luminosity and depth of eye sharpness.Material and methods. The effect of changing of the IOL position in the eye on changes in the values of physical parameters of retina luminosity and depth of eye sharpness was studied by the method of mathematical modeling and on the basis of the laws of geometrical optics.Results. The retina luminosity and the depth of eye sharpness (as an optical system) were evaluated depending on the movement of the IOL in the sagittal direction from the extreme forward position (anterior leaf of the native capsular bag, CB) to the extreme posterior position (posterior leaf of the native CB). It was determined that as the IOL moves away from the apex of the cornea and approaches the retina, its luminosity, depending on the diameter of the pupil, increases from 1.60 times (in medium illumination conditions) to 2.31 times (in twilight conditions). At the same time, the depth of eye sharpness has an increase of 1.21 times.Conclusion. The position of the IOL in the CB significantly influences the retina luminosity and the depth of eye sharpness. As the IOL moves away in the CB from the apex of the cornea and approaches to the retina, the luminosity increases, especially in twilight conditions. Also, when the lens approaches the retina, the depth of eye sharpness increases too. From this it follows that the location of the IOL in the CB closer to its posterior leaf (to the level of the native lens) is a reasonable reserve for an improvement of the investigated parameters of the eye. Taking into account the obtained results, we can assume with definite certainty that contrast sensitivity, depending on the parameters of luminosity and depth of eye sharpness, should also increase when the IOL approaches the retina, which should positively influence the quality of vision.

Keywords

• eye optical system
• iol position
• retina luminosity
• depth of eye sharpness
• mathematical modeling.