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Tinted Prescription glasses

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rubysapphy | 21:15 Tue 08th Aug 2006 | Science
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Can anyone tell me what solutions are used to create a tint on prescription lenses? How is it possible to get different colours, and a graduated tint?
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the coating of glass lenses is done by a complex process involving a vacum chamber, and an ion ray which atomizez a compound which them coats all surfaves, including the glass lense

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Tinted Prescription glasses

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