Definition of long-sighted adjective from the Oxford Advanced Learner's Dictionary

long-sighted

adjective
 
;
 
(especially British English) (also far-sighted especially in North American English) [not usually before noun]
 
not able to see things that are close to you clearly
She's long-sighted and needs glasses to read.
Opposite
short-sighted
long-sightedness
 
;
 
(also long sight) noun [uncountable]