Verification Of Power Of Back Surface Aspheric Contact Lenses.

Aspheric bifocal contact lenses for correction of presbyopia is increasing in popularity. With an increase in usage, a simple and efficient means of verification of power of these lenses must be achieved. The problem with conventional lensometry of aspheric bifocal contact lenses is the measuring of the peripheral portion of the contact lens where the extra plus add is located. This study will show a technique for measuring the approximate add at different
intervals from the center of the contact lens. In the study, nineteen back surface aspheric contact lenses were used.