Ophthalmic Review Volume . 17

Ophthalmic Review Volume . 17

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...while those of long duration are very rarely so. In 52 cases of periodic squint the average duration before treatment began was two years; in 100 cases of continuous squint it was five and a half years. It is unfortunate that so few of these children come under treatment in the periodic stage--16 per cent. in my experience--for it is then as a rule that the squint is cured most easily. In some cases, however, a squint appears to be continuous from the very onset, and in some it certainly remains periodic for many years, though on that point an error of observation is easily made; some cases which appear to be periodic are really continuous, but variable in degree; the corneal reflex shows a small deviation during the periods of supposed intermission, and binocular vision is, of course, continuously absent. Both in the periodic and in the continuous stage the large majority of squints are monolateral; in a total of 318 cases I found 259, i.e., 81 per cent., to be so. The alternating squints, constituting 19 per cent., were characterised with few exceptions by nearly equal refraction and nearly equal vision in the two eyes. But the two groups are not absolutely separable; a squint which is usually monolateral is not necessarily so at all times; the behaviour of the eyes will vary according to the precise method of testing them. In the continuous stage, whether the squint be alternating or monolateral, the suppression of the deviating image becomes more and more complete, and the act of convergence becomes more and more dissociated from visual perception. The heteroscope shows this clearly. The great majority of squinters old enough to be tested with this instrument or with the fusion-tubes, can see with the two eyes simultaneously; they see the...show more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236619196
  • 9781236619198