| http://www.w3.org/ns/prov#value | - Because of this, they are termed non-prescription glasses; however, they still have a specific magnification ??? usually ranging from +0.25 to +6.00 ??? in each lens, which is called a ???power??? or ???strength.??? Where it gets confusing is that this means they still technically hold a prescription, but the prescription is set and is the same magnification level for each eye.
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