moon blindness vs mooneye

moon blindness and mooneye both are nouns.

Word	Noun	Adjective	Verb	Adverb
moon blindness	Yes	No	No	No
mooneye	Yes	No	No	No

As nouns, moon blindness and mooneye are synonyms defined as:

moon blindness and mooneye: recurrent eye inflammation in horses; sometimes resulting in blindness

moon blindness (noun)	mooneye (noun)
recurrent eye inflammation in horses; sometimes resulting in blindness	recurrent eye inflammation in horses; sometimes resulting in blindness
inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder