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==Rounding== | ==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 it is written for contacts. | 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== | ==Contacts Vs Glasses== | ||