P. Fecko

Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study 4 years after surgery for myopia. Perk Study Group.

P. Asbell, W. Culbertson, M. Lynn, 1990, JAMA.

Stability of refraction and visual acuity during 5 years in eyes with simple myopia. The PERK Study Group.

A. Nizam, P. Asbell, W. Culbertson, 1992, Refractive & corneal surgery.

Results of the prospective evaluation of radial keratotomy (PERK) study one year after surgery.

G O Waring, Michael S. Isaac, P R Laibson, 1985, Ophthalmology.