(b) Periodic squint in 4 cases with good vision.
5. Myopia with nystagmus and congenital amblyopia on both sides, 2 cases (not included in the statistics of vision). Altogether 56 cases, among them 10 with periodic squint.
B. Convergent squint in emmetropia, including simple myopic astigmatism, 98 cases.
(a) Permanent 81 cases (13 previously operated on). Visual acuteness more than 1/7 in 44 cases. V. less than 1/7 to V. = 1/12 6 cases; V. less than 1/12 to V. = 1/36 20 cases; V. less than 1/36 7. Excluded from statistics of vision 4 (3 on account of complications, 1 on account of lack of accurate information).
(b) Alternating convergent squint with emmetropia in one, myopia in the other eye, 4 cases. The degree of the myopia was 3·75 D., 5 D., 6 D., 12 D. Vision good on both sides.
(c) Periodic squint 13 cases (in 6 of them the refraction was objectively and subjectively determined in mydriasis by atropine). No anisometropia worth mentioning was present in any of these cases. Visual acuteness more than 1/7 9 cases. V. < 1/7 to V. = 1/12 2. V. < 1/12 to V. = 1/36 1; one case with choroiditis excluded.
C. Convergent squint with doubtful hypermetropia to H. = 1 D., including simple hypermetropic astigmatism, 38 cases.
(a) Permanent 30 cases (5 previously operated on). Visual acuteness more than 1/7 7 cases. V < 1/7 to V. = 1/12 2. V. < 1/12 to V. = 1/36 5. V. < 1/36 2 cases. 4 excluded (3 complicated with cataract, one on account of impossibility of a trial of vision).
(b) Periodic squint 8 cases. V. more than 1/7 7. V. < 1/7 to V. = 1/12 1 case.
D. Hypermetropia 1 D. to 1·5 D. 37 cases.