Fifty-three persons with healthy eyes were fitted with spherical contact lenses and monitored over a 90-day test period. Clinical tests of keratometry, central corneal clouding and subjective spectacle blur refraction with resultant visual acuity were conducted at four time intervals and those test constituted the profiles. Adaptation was judged complete for 78 eyes. The critical test was the subjective blur refraction and the resultant visual acuity. The keratometer flat meridian was also unchanged. The observation of central corneal clouding did not correlate with these findings. The remaining 23 eyes were not adapted in the 90-day test period. These eyes were identifiable as early as the first day of wear.Four profiles of adaptation were built; fast adapting eyes, slow adapting eyes, eyes with near spherical corneas and eyes with astigmatic corneas.