farsightedness has 8 distinct synonyms spread across 3 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
abnormal condition in which vision for distant objects is better than for near objects
seeing ahead; knowing in advance; foreseeing
Synonyms, antonyms and the broader and narrower relations for farsightedness come from Princeton University’s WordNet. Full sources and licences.