Which corneal refractive surgical procedure is least likely to cause permanent vision change?

LASEK, or Laser Epithelial Keratomileusis, involves the use of an alcohol solution to loosen the epithelium, allowing it to be folded back while the underlying corneal tissue is reshaped with a laser. One of the key characteristics of LASEK is its minimally invasive nature compared to other procedures like LASIK or RK, where deeper cuts or alterations are made to the cornea.

The technique used in LASEK typically results in a smoother healing process, with less risk of significant long-term visual disturbances. Since the epithelial layer is preserved and only temporarily removed, the risk of permanent changes is lower. This makes it particularly suitable for patients who may have thinner corneas or are concerned about the risks associated with more invasive surgeries.

On the contrary, other procedures such as LASIK, which involves creating a flap in the cornea, and RK (Radial Keratotomy), which involves making incisions in the cornea, may lead to more significant and sometimes permanent changes in vision. PRK, while also being a surface ablation procedure like LASEK, can result in longer healing times and more discomfort, which could influence the outcomes in the long term.

Overall, LASEK is