視力的英文

astigmatism   / əˈstɪgmətɪzəm; əˋstɪɡməˏtɪzəm/ n [U] 

defect in an eye or a lens that prevents correct focusing 

（眼睛）散光, 亂視; 

cataract   / ˈkatərakt; ˋkatəˏrakt/ n 

large steep waterfall
(medical ) (a) disease in which the lens of the eye becomes cloudy, causing partial or total blindness 白內障. 

glaucoma   / glɔːˈkəumə; ɡlɔˋkomə/ n [U] 

eye disease causing gradual loss of sight 青光眼

nearsighted    adj especially AmE

unable to see things clearly unless they are close to you

far-sighted  

especially AmE able to see or read things clearly only when they are far away from you