Weight of edged lenses in different eyewire shapes and sizes

Abstract

Weights of edged lenses in different eyewire shapes and sizes were studied through mathematically generated eyewire shapes. The patterns of weight variation are often regular and predictable. The relation of lens weight changes in neighbouring sizes of a given eyewire shape and that in different boxed vertical lens dimensions of a given general eyewire appearance were established. These results were verified with physically edged lenses. Through these relations, it will be possible to predict the amount of weight change in a pair of spectacles upon changing the frame size and in some cases of eyewire shape modification.