CASE 41.--Miss A. L--, æt. 27, is stated to have commenced to squint in
her first year, until at the age of eighteen she took pains to cure the
habit, and with perfect success as far as regards the position of the
eyes; the only disagreeable symptom was that she could no longer read
with the naked eye. Spectacles were therefore prescribed for her, convex
5 D., but even they did not quite remove the trouble in reading; it was
now a disagreeable, painful sensation to have recourse to squint in
order to see more clearly. It was easiest to read with greatly lowered
field of vision and with the help of a convex eyeglass as well as the
spectacles. During the examination I found on the right hypermetropia
5·5 D., visual acuteness 5/12 to 5/9, on the left with + 5·5 D., V =
1/12. With convex 6 D. No. 0·5 was read at 12 inches from the glass, but
not nearer, with normal fixation on both sides. The binocular near point
(if we may employ this expression in the absence of normal binocular
fusion) was considerably removed without the existence of paresis of the
accommodation, despite the over-correction of the hypermetropia. It was
rather a question of the same disposition of the relative amplitude of
accommodation as I have previously described in a similar case. By
methodical practice of binocular vision, I had taught an intelligent boy
to fix binocularly, not only for distance, but also for near objects,
but here again the relative amplitude for accommodation was diminished,
so that with correct binocular fixation he could only read with convex
glasses, which greatly over-corrected the hypermetropia. Finally, the
normal amplitude of accommodation was restored by tenotomy of the left
internal rectus, and when I saw the patient twelve years later I was
able to satisfy myself that both were perfectly preserved. In the case
of Miss L--, I believed I ought to give up all thoughts of an operation;
the position of the eyes could not be improved, convex 5·5 D. eyeglass
perfectly sufficed for distance, and convex 7 D. spectacles for reading.
It seemed to me senseless to perform tenotomy merely to enable her to
use the same glass for distance and for near objects, without any
possibility of a cosmetic improvement. Moreover the condition of
binocular vision quite confirmed the statements as to the previous
squint. Diplopia could only be produced now and then with the help of
prisms and red glass, at first the right visual field only was seen in
the stereoscope, on closer observation also the left, but without
binocular fusion.
Besides, the proved decrease of the relative power of accommodation in
both these cases, marked by a voluntary suppression of the squint, does
not appear in those cases where squint disappears of itself, the state
of the accommodation, therefore, shows nothing unusual.
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