Word: methyl
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Dates: during 1960-1969
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...white of the eye), heavy (made of glass), hard to fit and forbiddingly expensive. Early plastic lenses were also of the big scleral type, had to float on a bath of special wetting fluid, and could be worn only four to five hours at a stretch. Then came the methyl-methacrylate plastics (of the Plexiglas family), the discovery that fluid was unnecessary if lenses had a hole to permit tears to pass beneath, and development of the tiny corneal lens, which covers only the eye's iris. The boom...