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Refractive surgery induces optically abrupt changes in shape in the midperiphery of the cornea.
The abruptness of this change is in part dependent on the magnitude of the surgically induced refractive change. Measurements were made before and 2 years after RK surgery. To quantify the WFV of the cornea, we used corneal topography measurements to calculate the surgically induced change in corneal WFV with respect to two different reference surfaces, a sphere and the presurgical cornea. As the magnitude of the surgically induced refractive change increases so does the WFV of the cornea, particularly for large pupils. The increase in corneal WFV for large pupils is dominated by fourth order aberrations.