_Table of Refraction and Visual Acuteness in Divergent Squint._ [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. -------------------+---+----+----+----+----+----+----+----+----+----+----+--- | A | B | C | D | E | F | G | H | I | J | K | L -------------------+----+----+----+----+----+----+----+----+----+----+----+-- Hypermetropia | 4| 1 | -- | -- | 1 | 2 | 5 | 3 | 1 | 1 | -- | -- Emmetropia | 37| 18 | -- | 10 | 3 | 6 | 28 | 27 | 1 | -- | -- | -- Myopia to M. 2 D. | 24| 15 | 2 | 3 | 2 | 2 | 23 | 23 | -- | -- | -- | -- M. 2 D. to 4 D. | 17| 9 | 1 | 2 | 1 | 4 | 8 | 7 | -- | 1 | -- | -- M. 4 D. to 6·5 D. | 10| 5 | -- | -- | 3 | 2 | 9 | 5 | 1 | -- | -- | 3 M. more than 6·5 D.| 8| 4 | -- | -- | -- | 4 | 10 | 9 | 1 | -- | -- | -- -------------------+---+----+----+----+----+----+----+----+----+----+----+--- |100| 52 | 3 | 15 | 10 | 20 | 83 | 74 | 4 | 2 | -- | 3 -------------------+---+----+----+----+----+----+----+----+----+----+----+--- It follows then from this, that periodic absolute divergent squint is just about as frequent as the permanent form and that both become more rare as the degrees of myopia increase. As, however, in spite of this, myopia is present in about 60 per cent. of all cases, the connection can be no other than this, that myopia frequently unites itself with insufficiency of the interni and preponderance of the externi; in this respect, as in every other, myopia and hypermetropia are directly opposed. The setting up of a "hypermetropic divergent strabismus," dependent on hypermetropia, seems to me only to show how much people have been carried away by the idea that the cause of the squint must be given by the state of refraction. Isler claims 17 to 29 per cent. of the cases for hypermetropic divergent strabismus; of these, however, the half possess only slight hypermetropia of 2 D. or less, which perfectly agrees with the fact that the same observer has also found in convergent squint a remarkably high percentage of the lower degrees of hypermetropia.