In the first of a two-part series on the process of lens manufacture from the original blank to the final spectacle lens, Andy Hepworth begins with the production process for semi-finished blanks. Module C8425, one general point for optometrists and dispensing opticians
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It is of course possible to create a finished lens - such as an uncoated stock single-vision lens - without the need to manufacture. However, this article covers only the processes involved in 'non-stock' prescription lenses. The vast majority of these lenses begin with a semi-finished blank into which the patient's prescription and coating treatments are manufactured in strictly controlled laboratory conditions.
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