How many letters does the top answer for “another word for longsightedness” have?

The most common answer is hypermetropia (13 letters).

Crossword clue: another word for longsightedness

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

hypermetropia 13 letters gen-syn

abnormal condition in which vision for distant objects is better than for near objects

hyperopia 9 letters gen-syn

abnormal condition in which vision for distant objects is better than for near objects

another word for about 50% similar → approximately, roughly, some

another word for terms 50% similar → footing

another word for under 50% similar → nether

another word for word 50% similar → phrase