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Eubee B Koo, Tavish Nanda, Daniel Choi, Victoria Chang, Allister Gibbons; Investigation of corneal spherical aberration in a specific population of patients with and without prior refractive surgery as compared to preexisting normative data. Invest. Ophthalmol. Vis. Sci. 2018;59(9):4786.
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© ARVO (1962-2015); The Authors (2016-present)
To date, there is still limited data on what might be considered normative data for corneal spherical aberration (CSA) measurements and regional differences have not been considered. This retrospective, observational study aimed to better characterize the effect of prior refractive surgery on corneal spherical aberration (CSA) in a specific cataract surgery population of South Florida.
Three hundred and ninety eyes of 195 subjects aged 60 years or greater undergoing cataract surgery were included in this study. CSA values were obtained from standard preoperative corneal assessments measured using the Pentacam (OCULUS, Germany) using the WFA Z40 at the 6-mm zone.
The mean CSA of the patients with no prior refractive surgery was 0.37± 0.11 um. Patients with previous hyperopic corneal ablation had a mean WFA Z40 of -0.06 ± 0.17 um. Patients with previous myopic corneal ablation had a mean WFA Z40 of 0.83± 0.3 um. This difference was statistically significant between groups (p<0.001). A positive correlation was found between WFA Z40 and increasing age (r = 0.18, p = 0.01).
Our results suggest that CSA has a positive mean with a significant standard deviation among this patient population; this was similar to other studies conducted in other parts of the country and world. Regional differences, thus, may not be a large factor in CSA variability as opposed to prior refractive surgery.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
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