Soft lens base curve measurements

This paper discusses the problem of verifying the base curves of soft lenses and describes a base curve measurement system which is both efficient and inexpensive. It also describes research studies using this base curve measurement system to compare lathe cut versus spin cast lenses, and to determine changes which take place in the base curves of soft lenses after cleaning and abuse. It was found that lathe cut lens base curves are not as accurate, when compared to the bottle label specified base curves, as are spin cast lenses. It was also found that spin cast lenses do not change base curve configuration as a result of cleaning and asepticizing but do change as a result of repeated dehydration and rehydration.