It is especially devastating when that something that you lose is your sight. To grow up in this life that accommodates that certain sense, never really understanding that it could be gone in a matter of years. This is what happens in the genetic disease called retinitis pigments. Patients that suffer with this inherited disease causing retina degeneration, start off with functioning sight then within time performance decreases to nothing and the patient is virtually blind within years.
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Source: http://archiengi.com/woman-gains-sight-with-new-bionic-eye