Word: lensed
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Dates: during 1960-1969
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...Boom. Foreshadowed by Leonardo da Vinci in 1508, contact lenses were first made in Europe in the 1880s. They were big, covering most of the sclera (the 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...
* Natural black pearls and natural canary diamonds are rare. A black pearl four-tenths of an inch in diameter is worth up to $7,500 compared to $350 for a culture white pearl dyed black. A large canary diamond (not to be confused with off-color or cheap "yellow" diamonds...