Medical contact lenses are used for the visual rehabilitation of irregular corneal surfaces. This irregularity may be due to a medical process such as keratoconus, pellucid marginal degeneration or other disorders of the cornea.  Corneal irregularity may also be due to previous ocular surgery such as LASIK, PRK, or corneal transplantation. Permanent scarring due to trauma, thinning of the cornea, or chronic dry eyes may also cause corneal irregularity.

All of these conditions may benefit from the assessment, adjustment and prescription of a medically necessary contact lens. Soft, gas permeable and hybrid contact lenses (a fusion of both gas permeable and soft lens) may be used separately or in conjunction to provide clearer, more stable vision for patients. Many previously unsuccessful contact lens wearers or patients that previously could not be prescribed contact lenses, or could not tolerate contact lenses may benefit from recent innovations in contact lens designs, manufacturing and materials.