The relationship between higher-order aberrations and the spherical component of refraction

Session Details

Session Title: Paediatric Ophthalmology & Other Topics

Session Date/Time: Tuesday 25/09/2018 | 08:00-10:30

Paper Time: 09:06

Venue: Room A3, Podium 2

First Author: : A.Kachanov RUSSIA

Co Author(s): :    A. Varavka   S. Bauer   B. Zimin              

Abstract Details

Purpose:

To evaluate statistical analysis of the relationship between the level of the higher-order aberrations (HOA) and the spherical component of refraction.

Setting:

1 - St.-Petersburg branch of Sv. Fyodorov “Eye Microsurgery Clinic”; 2 – North-Western State Medical University named after I.I. Mechnikov. St.-Petersburg, Russia; ³ - Saint-Petersburg State University.

Methods:

HOA measurements of 385 eyes of patients with emmetropia and ametropia were conducted by using CRS-Master aberrometer (“Carl Zeiss Meditec”). The following indicators were taken into account for aberrometric analysis: S – spherical component of the eye refraction; PV OPD – total aberration of the eye (low and high); PVD OPD HO – the integral level of HOA; the 3-d and 4-th-order Zernike polinomials. The eyes were divided into 7 groups with low (77 eyes), moderate (123 eyes), and high myopia (58 eyes), emmetropic eyes (22 eyes) and eyes with low, moderate, high hyperopia (19, 28, 31 eyes, respectively).

Results:

The distribution of PV OPD HO index differs significantly from the normal distribution. This is confirmed by the use of the Pearson chi-square test with test statistics of 199.25. Critical value with ν=N-3=2 degree of freedom, where N is the number of categories, is 9.21. By virtue of the fact that the null hypothesis of normal distribution was rejected, we will use non-parametric criteria. In all groups, but emmetropic group, the small inverse statistically significant dependence between S and PV OPD HO was revealed. In the joined group of all eye Spearsman's rank correlation coefficient r is -0,26.

Conclusions:

high-order aberrations are inherent in emmetropic as well as in ametropic eyes, but the level of the high-order aberrations is slightly increase in eyes with moderate and high myopia.

Financial Disclosure:

-