WEIGHT OF EDGED LENSES IN DIFFERENT EYEWIRE SHAPES AND SIZES

Weights of edged lenses in different eyewire shapes and sizes were stu died through mathematically generated eyewire shapes. The patterns of weight variation are often regular and predictable. The relation of le ns weight changes in neighbouring sizes of a given eyewire shape and t hat in different boxed vertical lens dimensions of a given general eye wire appearance were established. These results were verified with phy sically edged lenses. Through these relations, it will be possible to predict the amount of weight change in a pair of spectacles upon chang ing the frame size and in some cases of eyewire shape modification.