Plastic lenses are currently the most commonly prescribed lens, due to their relative safety, low cost, ease of production, and outstanding optical quality. Colour measurement is performed throughout the manufacturing process of ophthalmic lenses and blanks, from incoming QA tests of the liquid polymer ingredients to that of their finished products, including the film used as polarisers in prescription sunglasses and anti-reflection coatings. Colour measurement is also used for weathering or performance testing, and colour testing for lot-to-lot tint characteristics.

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