| http://www.w3.org/ns/prov#value | - In truth, the upgrades are not medically necessary as they simply relieve the patient of the need to wear glasses, but the option for the patient to pay has opened Pandora's box, and interestingly given device makers an easy out rather than fighting to have newer technology covered.The best example is laser cataract surgery, a technology that would make surgery performed by the average surgeon
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