Posters
Effect of difference between refractive and keratometric astigmatic axis on photorefractive keratectomy (PRK) outcomes
Poster Details
First Author: M.Ghoreishi IRAN
Co Author(s): M. Peyman A. Sadeghi
Abstract Details
Purpose:
To evaluate the impact of difference between refractive and keratometric astigmatic axis on photorefractive keratectomy (PRK) outcoms
Setting:
Persian Eye Clinic and Parsian vision research institute, Isfahan, Iran
Methods:
Sixty three eyes of 63 Subjects with internal astigmatism ≥ 1.00 D and mean age of 29.6 ± 5.95 (range 21 to 44) years were enrolled in this study. We divided eyes into two subgroups based on the difference between the axis of refractive and keratometric astigmatism; group 1 (axis difference> 30°) and group 2 (axis difference ≤30°). Internal astigmatism was calculated by vectorial analysis of the difference between the corneal plane refractive astigmatism and keratometric astigmatism. Visual acuity, refractive and keratometric astigmatism were evaluated before and 6 months after surgery.
Results:
There were no significant difference in pre- and post-operative refractive, keratometric and internal astigmatism between two groups. Difference between UDVA and CDVA pre- and post operative were not significant between groups, but change in CDVA was significantly better in group 2 (p=0.02). The keratometric difference vectors of astigmatism correction were 0.97 ± 0.45 D and 1.07 ± 0.46 D in group 1 and 2, respectively that is not significant different (p=0.363). Regarding astigmatism axis we found a mean difference in the values between the axes of the keratometric and refractive astigmatism of 17.04 ± 21.41 degrees (range 0-89 degree)
Conclusions:
Difference in the axis between refractive and keratometric astigmatism did not affect astigmatism outcome after PRK, but we found the eyes with lower difference between the refractive and keratometric astigmatism axis had a little but significant better visual outcome.
Financial Disclosure:
None
