(_b_) Periodic squint 2 cases with very slight anisometropia and good vision. 2. M. 2 D. to M. 3 D. 11 cases, all permanent (6 cases previously operated on), anisometropia with good vision in both eyes in 2 cases (in both, the less myopic eye squints). V. of the squinting eye more than 1/7 in 6 cases. V. 1/12 - 1/18 1 case. V. 1/24 - 1/36 2 cases. V. less than 1/36 2 cases (one with H = 5 D). 3. M. 3·5 D. to 6 D. (_a_) Permanent 11 cases (one previously operated on). Anisometropia in 2 cases, of which one consisted of alternating squint, while the other possessed in the fixing eye M. 4 D., in the squinting one M. 7·5 D. with good vision on both sides. V. more than 1/7 7 cases. V. 1/24 1 case. V. 1/36 1 case (in fixation with this eye; the visual axis shows a linear deviation of 2 mm. The presence of emmetropia is detected with the ophthalmoscope). Two cases were excluded from the statistics of vision, one on account of congenital capsular cataract, covering almost the whole pupil area, the other on account of choroiditis of the macula lutea. (_b_) Periodic squint 4 cases with good vision, anisometropia in 2 cases. 4. M. 6·5 D. and more. (_a_) Permanent 11 cases, among them 9 with V. more than 1/7, 2 excluded from the statistics, one on account of complication with corneal nebulæ, cataract, &c., the other possessed in the fixing eye M. 6·5 D. V. = 10/70 and slight nystagmus, in the squinting eye a smaller amount of sight not accurately noted, and strong nystagmus in fixing with this eye. (_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.