Soft lens power and curvature: a comparison of "label" and observed measurements

Determining the concave curve by a projection method, 350 spin cast lenses were compared with information published by the manufacturer. The power was also determined, using Sarver's method, to establish the clinical reliability of label powers. An equal number of lathe cut lenses were subjected to the same tests. Results indicated that spin cast lenses are very nearly as described in the manufacturer's published information. The lathe cut lenses involved in this study were not as dependable. Variations in the power of "C" series lenses and other related observations are also reported.