Which corneal refractive surgery is NOT allowable in army aviation?

Radial keratotomy is classified as a corneal refractive surgery that is not allowable in army aviation due to the potential for complications associated with this procedure. Unlike other refractive surgeries such as PRK, LASIK, and LASEK, radial keratotomy involves making incisions in the cornea that can lead to various visual anomalies and stability issues over time. These complications can impact a pilot's ability to perform their duties effectively and safely.

Army aviation places great emphasis on the need for reliable vision correction methods that maintain visual acuity and stability, especially under stress and during dynamic flight conditions. The other procedures mentioned—PRK, LASIK, and LASEK—are generally accepted as they have been shown to provide predictable outcomes with less risk of complications that could impair a member's flying capabilities. Therefore, the restriction against radial keratotomy stems from safety considerations that prioritize the well-being and effectiveness of aviators.