Paul McCarthy and Andrew Cripps describe a study aiming to determine whether or not the refractive index of an ophthalmic lens could be estimated with sufficient accuracy using equipment generally available in an optical practice
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The development of different materials suitable for manufacturing spectacle lenses has presented the dispensing optician with a problem: how can materials be identified? Whereas glass and plastics materials are easily distinguishable, any further classification is difficult without more detailed examination.
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