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He has very little sight in his right eye.

他右眼视力极弱。

《牛津词典》

A blind eye can no longer sense sight, but a bionic eye can use a camera to "see" the environment and send information to the mind.

眼睛失明后无法再次感知视觉，但仿生眼可以利用摄像头“看见”周围景象，之后给大脑发送信息。

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Professor Marshall now plans more studies in patients already suffering from AMD in one eye with the aim of saving the sight in their better eye for as long as possible.

BBC: Laser 'cure' for blindness tested

Tony Watson, 69, is blind in one eye and wants the drug Lucentis to save the sight in his other eye.

BBC: NHS Lucentis drug refusal could 'leave man blind'

"I lost the sight in one eye and the other faded within six months, " he said.

BBC: Blinded soldier Paul Jacobs targets 2016 Games