STEFFAN opposes the idea of amblyopia ex anopsia, recognizing only congenital amblyopia. The operative treatment of squint should be undertaken only when all other means of obtaining the desired result fail. Until the refraction of a child has become fixed, one should not operate. The earlier the operation, the less certain will be the ultimate result.
Reference: Progress in ophthalmology. Arch Ophthalmol. 1898;27:228.
A look at the past .... Arch Ophthalmol. 1999;117(2):183. doi:10.1001/archopht.117.2.183