Posters

Higher order aberration profiles in normal refractive surgery candidates: comparison between south Asian and Arab eyes

Poster Details

First Author: D.Srivastava UNITED ARAB EMIRATES

Co Author(s):    G. Prakash   S. Choudhuri   R. Bacero              

Abstract Details

Purpose:

to compare the ocular monochromatic higher order aberration (HOA) profile in normal refractive surgery candidates of Arab origin and South Asian origin.

Setting:

Dept of Cornea and Refractive Surgery, NMC Eye care, NMC Specialty Hospital , Abu Dhabi, UAE

Methods:

This cross-sectional, observational study was performed at the cornea services of a specialty hospital. Normal refractive surgery candidates having no ocular morbidity except refractive error were recruited. After detailed pre-refractive surgery evaluation, 200 consecutive candidates of Arab origin (group 1) and 200 of south-asian origin (group 2) (total 400 candidates) underwent wavefront aberrometry on iDesign aberrometer (AMO, CA). The wavefront data of right eyes was analyzed for HOA signed ,absolute & polar Zernike coefficients.

Results:

The mean Higher order root-mean-square(HOARMS) was 0.36±17µ and 0.38±18µ for Arab and south-Asian eyes respectively (p<0.05, Rank sum test(RST)). Of the 22 higher-order signed Zernike modes,only Z3-3, Z3-1, Z31, Z4-4, Z4-2, Z40, Z44, and Z5-5 were significantly different from zero (one sample t-test, p=0.002,Bonferroni correction=0.05/22 ). All the signed and absolute Zernike terms were comparable between the two groups (RST, p>0.002 (0.05/22)). The polar coefficients of coma, trefoil, spherical aberration and tetrafoil were comparable between groups (p>0.05, RST). Combined RMS values of third, fourth, fifth and sixth order also were comparable between groups(p>0.05, RST).

Conclusions:

Higher order aberration profile seems to be similar in normal, unoperated eyes of Arab and south-Asian origin.

Financial Disclosure:

NONE