Which refractive technique is reversible?

Intracorneal ring segments are considered a reversible refractive technique because they involve inserting small, crescent-shaped plastic devices into the stroma of the cornea. This method alters the curvature of the cornea, improving the eye's focusing ability without permanently changing the corneal tissue itself. If a patient wishes to revert back to their original vision or if they experience complications, the rings can be removed and the cornea will typically return to its natural shape.

In contrast, the other techniques listed involve more permanent alterations to the cornea. Photorefractive keratectomy (PRK) involves the removal of corneal tissue using a laser to reshape the cornea permanently. Radial keratotomy involves making incisions in the cornea, which can lead to permanent changes in corneal integrity and shape. Wavefront-guided LASIK uses a laser to reshape the cornea based on detailed measurements of the eye but also results in a permanent alteration of the corneal structure. Therefore, intracorneal ring segments stand out as the only reversible option among these refractive techniques.