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RE: “A day in the future”: blind people, now with better vision than you
In medicine, the concept of 'second sight' actually occurs naturally. It happens when someone with presbyopia (or a loss of elasticity in the lens caused by ageing) also gets cataracts or other sclerosing eye conditions which re-model this "stuck" lens. All of a sudden someone who's not been able to see for a long time can see... till the cataracts go pearly and they're blind again!
You can read more here :D
That is interesting! Thanks for sharing it!