Which surgical procedure is less likely to cause permanent vision change due to the thinness of the flap?

Which surgical procedure is less likely to cause permanent vision change due to the thinness of the flap?

• A. LASIK
• B. PRK
• C. LASEK
• D. SMILE

Answer: (C)

In refractive surgery, how thick the tissue moved or exposed during the procedure is a big factor in whether long-term vision can be altered. A thinner flap means less disruption to the cornea’s biomechanics and fewer chances for irregular healing that could lead to permanent refractive changes. LASEK lifts the very thin epithelial layer—think of it as a tiny, almost sleeve-like flap, on the order of a few dozen microns—then ablates the underlying stroma before repositioning that epithelial sheet. Because the moving piece is so thin compared with a full-thickness corneal flap, the potential for flap-related instability or irregular healing is reduced, lowering the risk of lasting vision changes tied to flap problems. In contrast, LASIK creates a thicker stromal flap, which carries more risk of flap irregularities or dislocation affecting vision. PRK removes the epithelium surface-style without creating a flap, which avoids flap issues altogether but involves more surface healing. SMILE avoids a traditional flap entirely by removing a lenticule through a small incision. Among these, the ultra-thin flap approach of LASEK specifically emphasizes minimizing flap thickness to reduce the chance of permanent vision changes due to flap-related factors.

In refractive surgery, how thick the tissue moved or exposed during the procedure is a big factor in whether long-term vision can be altered. A thinner flap means less disruption to the cornea’s biomechanics and fewer chances for irregular healing that could lead to permanent refractive changes.

LASEK lifts the very thin epithelial layer—think of it as a tiny, almost sleeve-like flap, on the order of a few dozen microns—then ablates the underlying stroma before repositioning that epithelial sheet. Because the moving piece is so thin compared with a full-thickness corneal flap, the potential for flap-related instability or irregular healing is reduced, lowering the risk of lasting vision changes tied to flap problems.

In contrast, LASIK creates a thicker stromal flap, which carries more risk of flap irregularities or dislocation affecting vision. PRK removes the epithelium surface-style without creating a flap, which avoids flap issues altogether but involves more surface healing. SMILE avoids a traditional flap entirely by removing a lenticule through a small incision. Among these, the ultra-thin flap approach of LASEK specifically emphasizes minimizing flap thickness to reduce the chance of permanent vision changes due to flap-related factors.