Homonymous torsion : a position of the retinal meridians heretofore unrecognized / by Edward P. Brewer.

  • Brewer, Edward P.
Date:
1898
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Licence: Public Domain Mark

Credit: Homonymous torsion : a position of the retinal meridians heretofore unrecognized / by Edward P. Brewer. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    ing to several degrees; yet in all there was perfect coordinat^n, a com- plete sense of location and an undisturbed unity of impression. This condition I have termed homo7iy7Jious torsion; if the declination be up- Avard and to the right it is right homonymous torsion; and if upward and to the left, left homonymoti^s torsion. The following illustat ive cases are, I believe, the first to be recorded; Case I. Mrs. O. W. aged 42. R.V. = ^with—1.25 D. cyl. ax.45=^|-L. V.=^| with—2 D. cvl. ax. 170° =|f—Javal Ophthalmometer R. 1.50 ax. i20° L. 2 D. ax. 90° abduction 8°. Measurements in degrees of arc with Stevens’ tropometer R. up 32°, down 55°, in 55°, out 55°. L. up 30°, down 60°, in 70°, out 60°. Torsiometer measurements indicating the torsional power. *Right vertical meridians-|-6° of arc left meridian vertical, right vertical meridian—2° of arc left meridian vertical. Left vertical meridian-f-7° of arc left meridian vertical. Left vertical meridian—2° of arc left meridian vertical. The position of the vertical meridians when the eyes were disassociated by a prism and adjusted to a seemingly erect and a parallel position was upward and inward for the right eye and upward and outward for the left eye, each having a declination of six degrees. This condition of left homonymous torsion I express as follows: R. V. M.—6°OL. V. M.+6'^. Repeated and control tests made as described in the articles before re- ferred, gave uniform results. Case II. H. O. L.aged 13. R. V.=v|—with-po.25 D. cyl. ax. L. V.= —with-f-O-25 D. cyl. ax. Javal Ophthalmometer R. o. 50 D. ax. 90° L. 0.50 D. ax. 90° Abduction 5° Sursumduction right 1° left 1° Exophoria at infinity. O. at occupation distance. Stevens’Tropometer R. up 30°, down 45°, in 50°, out 45°. L. up 30°, down 45°, in 50°, out 50°. Torsiometer R. V. M.-|-5° L. V. M. -|-4° R. V. M.—2° L. V. M.—3°. Left homonymous torsion of 4°. The ver- tical meridians giving the reading R. V. M.—4°oL. V. M.-(-4°. Case III. S. C. aged 19. R. V.=^ with—1.50 D.o—0.50 D. cyl. ax. 90° = If L. V. = ^ with—1.50 D.o—0.25 D. cyl. ax. 90°=|f. Javal Ophthalmometer R. 0.25 D. ax. 90° L. 0.50 D. ax. 90° Abduction 8° Sursumduction right 2° left 2° = Esophoria 2° at infinity. O. at occupation distance Tropometer R. up 35°, down 45°, in 60°, out 40°. L. up 33°, doAvn 40°, in 50“, out5o°. Torsiometer R. V. M.-f-5° L. V. M.-|-5° R- V. M.—3° L. V. M.—3°. Left homonymous torsion of 3° R. V. M. —3=OL. V. M.+4°. Case IV. Mrs. J. C. aged 37. R. with-)-i-50 D. cyl. ax. iio° —L. V.=|f with-(-o.5o D. cyl. ax. 80° = Javal Ophthalmometer. R. 4 D. ax. 110° L. I D. ax. 80°. Abduction 5° Tropometer R. up 30°, down 43°, in 50°, out42°. L. up 30°, down 45°, in 50°, out 40°. Torsiometer R. V. M.-f-2° L. V. M.-|-2° R. V. M. —3° L. V. M.—4°. Left homonymous torsion of 1° R. V. M.—i°oL. V. M.-j-i°. Case V. J. H. aged 35. R. V.=Y^Q®jr with—2 D. cyl ax. iSo° = }f L. with—2 D. cyl. ax. i8o° = ||. Abduction 6° Esophoria 2)4° at infinity. Exopho- * ♦Hereafter I shall designate the right or left vertical meridian as R. or L. V. M.. as the case may be, the complementary meridian being always exactly vertical, unless otherwise stated. *