hemianopia

noun

hemi·​an·​o·​pia -ə-ˈnōp-ē-ə 

variants or hemianopsia

-ə-ˈnäp-sē-ə 

: blindness in one half of the visual field of one or both eyes

called also hemiopia

hemianoptic

-ə-ˈnäp-tik 

adjective