Betron Soft Contact Lens Base Curve Analyzer.

The measurement of the base curve radius of soft contact lenses is vital for proper fitting and lens replacement. However, measuring the base curve radius of hydrogel lenses
often poses a challenge in clinical practice. In this study, a ne device is utilized to measure the base curves of seven different soft lenses. The device utilized is the Betron Soft
Contact Lens Base Curve Analyzer. The contact lens to be measured is placed inside this unit and the unit is then placed on a radiuscope stage. The radiuscope is used to measure the sagittal depth of the lens. This is readily converted to the appropriate base curve utilizing a conversion table. The lenses tested include: Bausch and Lomb--03, B3, U3, and
U4; American Hydron--06 and 04; and Permaflex by Cooper Vision. Each lens was tested on six separate, non-consecutive trials. The six trials were averaged and a standard deviation calculated for each. The results obtained indicate that this device can be used with relative ease to obtain repeatable measurements. The measurements of most of the lenses were consistently flatter than the labeled base curve radius. The only lens to consistently measure steeper than the labeled base curve was the Hydron 04.