Chyzh I.G.

The Method for Evaluating Ametropia and the Depth of Focus of the Eye

The need is established for measuring pseudo-accommodation (the depth of focus of the eye) when a standard artificial or accommodative lens is implanted into the eye. It is specified the need for analyzing the impact of aberrations of a measuring device’s elements as well as the pupil’s diameter onto the accuracy of ametropia and pseudo-accommodation measurements by the method, proposed by the authors. In this study, a computer simulation is applied for an optical system of the measuring device and an ametropic eye with a diffuse-scattering retina.

Technique and Device for Measuring the Human Eye’s Depth of Focus

In this paper, we demonstrate that the depth of focus (DOF) of the eye’s optical system during implantation of intraocular lenses and aberration correction of presbyopian eyes should be identified and measured. The known methods and devices are described to determine the pseudo-accommodation volume of presbyopic eyes by subjective and objective methods. Their advantages and disadvantages are analyzed. We show that the main disadvantage of subjective methods is the impossibility to separate a pseudo-accommodation component caused by the eye’s optics from its total volume.

Temperature Defocusing of the Image in Optical Systems

We obtain the working formulae. Applying the analytical method, they allow analyzing the temperature effect of optical and mechanical elements of optical system on value of the image temperature defocusing, formed by optical system. Abbe invariant is used to determine the segment, which indicates the position of the image plane relative to the last optical surface of the optical system and is dependent on the temperature magnitude.

Permissible Errors of the Eye Aberrometry

This paper investigates the influence of the human eye’s aberrations on a diffraction image of two points at the retina. These points are located at spatial resolution threshold according to the Raleigh’s criterion. The diameter of a pupil zone was set to 3 mm, at which the eye has the highest sight acuity. We determine that in order to preserve normal spatial resolution of the eye the wavefront RMS of the eye should not exceed 0?1 of the wavelength. Based on this thesis, the criterion is proposed to evaluate permissible errors of eye aberrometry.

On Determining ranges of eye ametropy and astigmatism by Employing ophthalmology aberrometers

According to the results of eyes refractometry of patients of all age groups, we study the parameters of ametropy and astigmatism. The experimental results show that in accordance with the ametropy and astigmatism value the distribution of patients’ number is not Gaussian. On the experimental side, we demonstrate that operating ranges of the conservative ophthalmology aberrometer are based on the research results.

Simulation of aberrations of the optical system of the human eye. Part 1. Review and comparative analysis of physical eye models with aberrations

In this paper, we review and make a comparative analysis of physical eye models with aberrations. We propose a doublet lens model, free of prototypes’ drawbacks. By computation of the wave aberration values, we prove the ability of the proposed model to simulate the wave aberrations, identical to those in the human eye.

Aberrations of an Optical System of the Human Eye Chapter 2. Technological errors of a doublet physical eye model with aberrations

The present study considers the influence of technological errors of construction parameters of the optical system of the human eye model on the errors of a simulated wave aberration. We verify the technological possibility of manufacturing the model with an accuracy of wave aberration simulation, sufficient for examining ophthalmic aberrometers