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3 bytes added ,  15:57, 10 June 2020
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grammar
==Rounding==
You will note that most prescriptions will round to the nearest quarter [[diopter]]. This is the level of precision available in standard pre-ground lenses, which make glasses cheaper and faster to make than custom ground lenses. You may have a more precise prescription if it is written for specific lens grinding systems, or a less precise prescription if it is written for contacts.
==Contacts Vs Glasses==

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