Abstract
A ballistic method for impacting spectacle lenses mounted in safety frames is presented. Industrial thickness polycarbonate lenses were found to resist fracture at high levels of impact energy, and were displaced from plastic and metal safety frames with and without accompanying frame fractures. Group comparisons revealed no significant difference between two types of plastic frames; a highly significant difference was revealed between either type of plastic frame and the metal frame. It is concluded that metal safety frames are not as effective as plastic frames in retaining plastic lenses against ballistic impacts. Furthermore, polycarbonate plastic lenses offer great promise for truly effective eye protection against missiles if scratch resistance of the lenses and retention performance of frames can be improved.
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