WHEN orthoptic treatment was first practised it was thought that, if it were applied in cases of non-paralytic strabismus where there was good visual acuity in each eye, restoration of normal binocular function would invariably result. In the early 1930s it was not unusual for children suffering from squint to be subjected to countless sessions of treatment with reflecting stereoscopes in the hope of establishing fusion. It was not until Chavasse (1939) published his theories with regard to the binocular reflexes and their development, that the true limitations of orthoptic treatment became more widely recognized. The important fact then emerged that, the earlier the onset of a constant strabismus and the longer the interval of time before corrective treatment is carried out, the less likely is it that normal binocular function will be restored, no matter how much orthoptic treatment is given.
No takes yet. Share an insight, caveat, or question.
Lyle et al. (1957) studied this question.