I wore "hard" contact lenses from 1966 into the 1980's. I believe these are what you are considering. They gave me wonderfully acute vision. Both of my opthamologists told me that I would be unhappy with soft lenses as visual acuity would suffer. Hard lenses do require an adjustment period and more regimented wearing times than soft lenses. I went back to glasses when I hit my fifties primarily because I got tired of the issues of contact lenses.
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