Posters

Comparisons of spheric and vector analysis of astigmatism results of four refraction methods

Poster Details

First Author: S.Bamdad IRAN

Co Author(s):    M. Abdolahian                    

Abstract Details

Purpose:

Purpose: The present study aims at evaluating the agreement between autorefractometer function and wavefront refractoin compared with the subjective refraction.

Setting:

Setting: Poostchi ophthalmology research center, Shiraz, Iran

Methods:

Methodology: Overall, 83 adults aged 19-57 years were enlisted throughout the course of routine eye examination. Then, subjects were examined using four methods including manual subjective refraction, wavefront refraction, noncycloplegic and cycloplegic autorefraction,. Refraction data were presented as the sphere, spherical equivalent and astigmatism. Astigmatism was converted to vector power and analyzed by the Alpins method.

Results:

Spheric results with noncycloplegic autorefraction was significantly over minus myopic and under plus hypropic and cycloplegic and wavefront refraction tended to over plus hyperopic and under minus myopic compared with subjective refraction(both P<0.001).The Pearson correlation coefficients for spheric values between cycloplegic, noncycloplegic and wavefront refraction values respect to the subjective refraction were high (r :0.961 , r :0.975,and r:0.978 respectively; allP<0.001). The difference of astigmatism vector power was 0.07±0.16 D and 0.06±0.17 Dlarger in the wavefront group than noncycloplegic and cycloplegic groups(bothP<0.001). There was no significant difference between astigmatism vector power of cycloplegic and noncycloplegic autorefraction

Conclusions:

Conclusions: As subjective refraction is gold standard in our study, sphere in wavefront re-fraction and astigmatism in autorefraction showed closer agreement.

Financial Disclosure:

None