In eyes with keratoconus undergoing corneal crosslinking (CXL), topography-guided photorefractive keratectomy (TG-PRK) provides superior refractive and functional outcomes compared with transepithelial phototherapeutic keratectomy (TE-PTK).
Yet, there remains a role for PTK, said Simon P. Holland, MD, at the 2018 ASCRS Symposium.
He reported results from a retrospective study that found TE-PTK provided no useful improvement in astigmatism or vision, whereas significant gains were achieved after TG-PRK.
Dr. Holland noted, however, that TE-PTK had the advantage of limiting stromal ablation, which can be important considering that it may decrease the likelihood of keratoconus progression and recognizing that some eyes with keratoconus have very thin corneas.
“Our results provide a case for both techniques in the refractive management of keratoconus with CXL,” said Dr. Holland, private practice, Pacific Eye Laser Centre, Vancouver, BC, and clinical associate professor of ophthalmology and visual sciences, University of British Columbia, Vancouver.