| http://www.w3.org/ns/prov#value | - For over 100 years, practitioners ranging from lens fitters to surgeons have engaged in the business of providing vision correction to the ametropic population, as technology permitted, through spectacles; more intimate devices such as contact lenses, intra-ocular lenses (IOLs), inlays and onlays; and via surgical procedures including cataract removal, keratoplasty (corneal replacement), variation
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