G. Hypermetropia 3 D. to 4·5 D. 54 cases. (_a_) Permanent 35 cases (9 previously operated on). V. more than 1/7 18 cases; V. < 1/7 to V. = 1/12 1 case; V. < 1/12 to 1/36 9; 7 cases excluded. (_b_) Periodic 19 cases. V. more than 1/7 14; V. < 1/7 to V. = 1/12 1; V. < 1/12 to V. = 1/36 3; V. < 1/36 1 case. H. H. 5 D. and more, 16 cases. (_a_) Permanent 9; V. to 1/7 3; V. < 1/7 to V. = 1/12 3; V. < 1/12 to V. = 1/36 2; V. < 1/36 1 case. (_b_) Periodic 7; V. to 1/7 4; V. < 1/7 to V. = 1/12 3 cases. _Table of Refraction and Acuity of Vision in Convergent Strabismus._ [Transcriber's note: Key created to make table fit page] KEY: A: Permanent B: V. to 1/7. C: V. < 1/7 to V 1/12. D: V. < 1/12 to V. 1/36. E: V. < 1/36. F: Excluded. G: Periodic. H: V. to 1/7. I: V. < 1/7 to V. 1/12. J: V. < 1/12. to V. 1/36. K: V. < 1/36. L: Excluded. --------------------+---+----+---+----+----+----+----+----+----+----+----+---- Convergent | | | | | | | | | | | | strabismus. | A | B | C | D | E | F | G | H | I | J |K | L --------------------+---+----+---+----+----+----+----+----+----+----+----+---- Myopia | 44| 26 | 2| 4 | 7 | 5 | 10 | 10 | -- | -- | -- | -- Emmetropia | 85| 48 | 6| 20 | 7 | 4 | 13 | 9 | 2 | 1 | -- | 1 H ? to H. 1 D. | 30| 17 | 2| 5 | 2 | 4 | 8 | 7 | 1 | -- | -- | -- H. 1 D. to H. 1·5 D.| 23| 13 | 3| 3 | 3 | 1 | 14 | 12 | -- | 1 | -- | 1 H. 1·5 D. to H. 2 D.| 41| 26 | 3| 3 | 2 | 7 | 20 | 16 | 2 | 1 | 1 | -- H. 2 D. to H. 3 D. | 58| 26 | 5| 17 | 4 | 6 | 30 | 24 | 3 | 1 | 1 | 1 H. 3 D. to H. 4·5 D.| 35| 18 | 1| 9 | -- | 7 | 19 | 14 | 1 | 3 | 1 | -- H. 5 D. and more | 9| 3 | 3| 2 | 1 | -- | 7 | 4 | 3 | -- | -- | -- --------------------+---+----+---+----+----+----+----+----+----+----+----+---- |325|177 | 25| 63 | 26 | 34 |121 | 96 | 12 | 7 | 3 | 3 --------------------+---+----+---+----+----+----+----+----+----+----+----+---- According to this the percentage of the hypermetropia (including doubtful cases) amounts to 66 per cent. Dr. Isler in his dissertation, 'The Dependence of Strabismus on Refraction,' gives the percentage of hypermetropia in convergent squint as 88 per cent.--a great difference, which can, however, be partly accounted for. Isler found in hypermetropia of 2 to 10 dioptres squinting in 75 per cent.; in my statistics H. 1·5 D. to the highest degrees of hypermetropia are likewise represented by 75 per cent. As the difference between H. 2 D. and H. 1·5 D. amounts to only half a dioptre, the results of the statistics agree perfectly within these limits; the difference lies only in the slighter degrees of hypermetropia, for the diagnosis of which refer to pp. 12 to 14.