biomicroscopic examinations of the corneal epithelium of 54 patients who had consecutive radial keratotomy operations in the national eye institute prospective evaluation of radial keratotomy ( perk ) study showed that abnormal stellate epithelial iron lines had appeared at the junction of the middle and inferior thirds of the cornea in 13 of 16 eyes ( 81 % ) examined six months after surgery , in 43 of 50 eyes ( 86 % ) examined 12 months after surgery , and in seven of nine eyes ( 78 % ) examined 24 months after surgery .
C0031809
examinations of
C0220825
evaluation