Taylor Gun-Jin Wang was also born in Shanghai in 1940 and became an American citizen in 1975 and has flown on the space shuttle once.

BBC: NEWS | Science/Nature | China space mission 'on track'

Prof Jie Jin Wang, an expert in vision research at Sydney University in Australia, said this was something doctors might want to discuss with high-risk patients.

BBC: Long-term aspirin 'blindness link'