@Bwee
I have keratoconus - progressive deformation of corneas. I characterize myself as "part-time blind" .
There are very sophisticated contact lenses that can get me to a decent (can drive but not at night) vision, but they are very uncomfortable. My lenses can only be worn an unpredictable ~8hrs/day, although it used to be 12 when younger.
Without my lenses, I can't see edges, I see too much light. Def "blind" w/o the lenses.