0 the treatment or study of problems of the eye muscles, for example having a squint (= when the eyes look in different directions) or having double vision (= when you can see two of everything):
Intermittent exotropia should be treated only with orthoptics.
Orthoptics is too vast a subject to be adequately covered in one chapter.
In America, students of orthoptics must attend 2 years of fellowship training.
