Word: perspex
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Dates: during 1950-1959
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...into the eyeball. Only the front part of the lens capsule, with the jelly, is removed; the back part of the capsule is allowed to remain as a sort of frame to keep the artificial lens from drifting farther back into the eyeball. The plastic chosen for the job (Perspex, similar to the Plexiglas used for airplane windshields) is only half as heavy as glass and is not likely to sink...