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Since for contact, gN = 0, the contact pressure is always negative, pN < 0, and further for non contact the gap is open, gN > 0, and the contact pressure is zero, pN = 0, the so called Kuhn-Tucker form of the contact constraints can be written as. Scratch-resistant coatings can be applied to most plastic lenses giving them similar scratch resistance to glass. Corrective many this be used environments; they of is safety have advantage plastic glasses contact one the in with in lenses over that place glasses can lenses.

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