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<http://schema.org/text>
"Keratoconus does not typically cause total blindness. However, as keratoconus progresses it can cause visual impairment  including blurred distance vision, distortion, glare, astigmatism, extreme light sensitivity and even vision loss that can be classified as “legal blindness."
<https://www.fivepointseyecare.com/category/scleral/>