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Objectives: To characterize toric contact lens prescribing worldwide. Methods: Up to 1,000 survey forms were sent to contact lens fitters in up to 39 countries between January and March every year ...

For example, the global contact lens market is worth an estimated US $6 billion at retail values. [5] Therefore, a global difference in toric lens prescribing of, say 1%, would have a potential ...

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In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.