Posters
Evaluating the change in corneal asphericity after SMILE and PRK
Poster Details
First Author: K.Sriprakash INDIA
Co Author(s): S. Ganesh S. Brar
Abstract Details
Purpose:
To evaluate and compare the change in the pre and post operative corneal ashpericity and study the induced spherical aberrations in patients undergoing Small incision lenticule extraction [SMILE] and Photorefractive Keratectomy[PRK] for myopia and myopic astigmatism
Setting:
Nethradhama Superspeciality Eye Hospital, India
Methods:
50 eyes each of age and refractive error matched patients undergoing SMILE and PRK for myopia and myopic astigmatism were evaluated. Pre operatively, the Q values of the anterior [Q1] and posterior [Q2] cornea and spherical aberration [Z(4,0)] were measured using the Pentacam® HR [OCULUS Inc]. The epithelial thickness profile was also measured. Similar values were taken on the 15th postoperative day and 3 months and compared.
Results:
Mean pre-operative Q1 was -0.324±0.06 and -0.359±0.22 in the SMILE and PRK group respectively[p=0.18], which changed to 0.265±0.23 and 0.231± 0.18 at the third postoperative month, the difference being statically insignificant[p=0.24]. Mean Z(4,0) value at postop 3months was 0.215±0.14µ and 0.319±0.12µ in the SMILE and PRK group respectively. The difference was statistically significant [p<0.05]. Pre-operative epithelial thickness was 53.95±3.63µ and 52.87±4.84 in the SMILE and PRK group respectively which increased to 54.069±4.19 and 59±5.34, the difference being statistically significant[p<0.05].
Conclusions:
At the third post operative month, both SMILE and PRK showed a change in the anterior asphericity value with a relatively unchanged posterior ashpericity value. Although, no statistically significant difference in the Q1 values was noted between the SMILE and PRK group, the induced spherical aberrations in the SMILE group were significantly lower as compared to the PRK group. This could be explained by the increased epithelial thickness profile seen in the PRK group.
Financial Disclosure:
... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented
