Three patients who had undergone laser in situ keratomileusis (LASIK) correction for myopia were first seen because of suboptimal visual acuity (VA) and night blindness and/or photophobia. After a comprehensive examination including psychophysical and electrophysiological tests, two of the three patients were shown to suffer from a progressive conerod dystrophy. The third patient had retinitis pigmentosa. These cases illustrate the need for in depth preoperative evaluation in myopic patients about to undergo LASIK when signs or problems of night blindness and/or photophobia are present.