Eye, eyesight and seeing

Your ability to see is called your eyesight, sight or vision 

Airline pilots need to have good eyesight
After his car crashed, Sam lost the sight of his left eye
Sarah's over 70 and she's still got perfect vision 

Some common problems with eyesight 

I'm getting long sighted (UK)/far-sighted (US) - I can't read a newspaper if it's too close to me
She's so short sighted (UK)/near-sighted (US) she can't find her glasses if she takes them off
Alice is blind/has lost her sight and needs a guide dog to help her
Drivers may be temporarily blinded/dazzled by the lights of approaching cars
For years he's suffered from poor eyesight
Those exposed to the gas complained of headaches and blurred vision
I wear contact lenses but I always carry a spare pair of glasses