Posters

Outcomes of stepwise photorefractive keratectomy for the treatment of irregular astigmatism following deep anterior lamellar keratoplasty or penetrating keratoplasty

Poster Details

First Author: M.Parkar INDIA

Co Author(s):    P. Vaddavalli   J. Reddy   P. Gogri              

Abstract Details

Purpose:

To report the outcomes of stepwise ablation using photorefractive keratectomy (PRK) for the correction of irregular astigmatism following either penetrating keratoplasty (PKP) or deep anterior keratoplasty (DALK).

Setting:

Tertiary Eye Care Institute in India

Methods:

A retrospective review of all cases who underwent PRK between November 2014 and August 2018, for treatment of irregular astigmatism after PKP or DALK was done. Eleven eyes of eleven patients were included, and pre-operative and post-operative uncorrected visual acuity (UCVA), best -corrected visual acuity (BCVA), manifest spherical equivalent (S.E.) were recorded and analysed.

Results:

Nine eyes (81.81%) underwent DALK while two eyes (18.18%) underwent PKP. The mean UCVA and BCVA before PRK were -0.78 ± 0.37 logMAR and -0.26 ± 0.21 logMAR units, respectively, which improved to -0.31 ± 0.19 logMAR (p=0.18) and -0.16 ± 0.15 logMAR (p=0.03) respectively, at the last follow-up. The mean pre-operative and post-operative S.E. was -2.6 ± 1.23 and -0.75 ± 1.05 and this difference was found to be statistically significant (p= 0.01). Statistically significant improvement was seen in aberrometry indices (total root mean square, higher-order aberration root mean square, defocus, coma, trefoil, and spherical aberration).

Conclusions:

In cases of irregular astigmatism, topography-guided PRK is useful in improving the visual outcomes, and can be employed after refractive stability has been achieved.

Financial Disclosure:

None