What is the difference between the PRK and Trans-PRK procedure?

22 August 2024

Laser vision correction has advanced significantly in recent decades, offering a variety of options for those seeking clear vision without relying on contact lenses or glasses. Two of these procedures are PRK (Photorefractive Keratectomy) and Trans-PRK (Transepithelial Photorefractive Keratectomy). While both methods are effective in correcting refractive errors such as nearsightedness, farsightedness, and astigmatism, there are key differences in the technique and recovery process.

PRK

PRK is one of the oldest and most established refractive surgery procedures. In this method, the surgeon first manually removes the epithelium, which is the surface layer of the cornea. Once this layer has been removed, the MEL 90 excimer laser is applied to reshape the cornea and correct the refractive error.

Trans-PRK

Trans-PRK is an evolution of traditional PRK, where the MEL 90 excimer laser is used to remove both the epithelium and reshape the cornea in a single step. This technique eliminates the need for manual intervention by the surgeon to remove the epithelium, which reduces physical manipulation of the eye and, in theory, decreases the risk of infections or complications related to the manual process.
The choice between PRK and Trans-PRK depends on several factors, including the specific characteristics of the patient's eye. Both procedures are safe and effective options for vision correction, but Trans-PRK offers the advantage of a more advanced technique that may result in a slightly more comfortable recovery.