TY - JOUR
T1 - Increase in iris-lens contact after laser iridotomy for pupillary block angle closure
AU - Caronia, R. M.
AU - Liebmann, J. M.
AU - Stegman, Z.
AU - Sokol, J.
AU - Ritch, R.
N1 - Funding Information:
Accepted for publication Jan. 9, 1996. From the Department of Ophthalmology, New York Eye and Ear Infirmary (Drs. Caronia, Liebmann, Stegman, Sokol, and Ritch), New York, New York; and New York Medical College (Drs. Liebmann and Ritch), Valhalla, New York. This study was supported in part by the Glaucoma Foundation, New York, New York; Department of Ophthalmology Research Fund of the New York Eye and Ear Infirmary, New York, New York; and Fight for Sight Research Division of Prevent Blindness America, in memory of Herbert Temer, New York, New York (Dr. Stegman). Reprint requests to Robert Ritch, M.D., Glaucoma Service, New York Eye and Ear Infirmary, 310 E. 14th St., New York, NY 10003; fax: (212) 420-8743.
PY - 1996
Y1 - 1996
N2 - PURPOSE: To quantitate changes in anterior ocular segment anatomy after laser iridotomy for pupillary block angle closure. METHODS: We prospectively performed ultrasound biomicroscopy and A-scan biometry in 13 eyes of 13 consecutive untreated patients with relative pupillary block and appositional angle closure, without peripheral anterior synechiae on indentation gonioscopy. A radial, perpendicular image in the horizontal temporal meridian was obtained with ultrasound biomicroscopy before and one week after laser iridotomy in each eye. RESULTS: Mean age of the 13 patients was 69.3 ± 1.8 (S.E.) years, mean refractive error was +1.37 ± 0.39 diopters, and mean axial length was 22.54 ± 0.20 mm. In 13 eyes, before and after laser iridotomy measurements of angle-opening distance (0.11 ± 0.02 vs. 0.18 ± 0.02 mm) (P = .0004; paired t test), angle aperture (8.3 ± 1.3 vs 18.6 ± 2.8 degrees) (P = .0003) and iris-lens contact distance (0.58 ± 0.06 vs 1.18 ± 0.14 mm) (P = .0003) were greater postoperatively, but anterior chamber depth was unchanged (P = .7). CONCLUSIONS: Flattening of the iris after laser iridotomy for pupillary block causes an increase in iris-lens contact. The change in angle configuration after iridotomy results more from an alteration in aqueous pressure gradients across the iris rather than from posterior lens movement.
AB - PURPOSE: To quantitate changes in anterior ocular segment anatomy after laser iridotomy for pupillary block angle closure. METHODS: We prospectively performed ultrasound biomicroscopy and A-scan biometry in 13 eyes of 13 consecutive untreated patients with relative pupillary block and appositional angle closure, without peripheral anterior synechiae on indentation gonioscopy. A radial, perpendicular image in the horizontal temporal meridian was obtained with ultrasound biomicroscopy before and one week after laser iridotomy in each eye. RESULTS: Mean age of the 13 patients was 69.3 ± 1.8 (S.E.) years, mean refractive error was +1.37 ± 0.39 diopters, and mean axial length was 22.54 ± 0.20 mm. In 13 eyes, before and after laser iridotomy measurements of angle-opening distance (0.11 ± 0.02 vs. 0.18 ± 0.02 mm) (P = .0004; paired t test), angle aperture (8.3 ± 1.3 vs 18.6 ± 2.8 degrees) (P = .0003) and iris-lens contact distance (0.58 ± 0.06 vs 1.18 ± 0.14 mm) (P = .0003) were greater postoperatively, but anterior chamber depth was unchanged (P = .7). CONCLUSIONS: Flattening of the iris after laser iridotomy for pupillary block causes an increase in iris-lens contact. The change in angle configuration after iridotomy results more from an alteration in aqueous pressure gradients across the iris rather than from posterior lens movement.
UR - http://www.scopus.com/inward/record.url?scp=0029900125&partnerID=8YFLogxK
U2 - 10.1016/S0002-9394(14)71963-4
DO - 10.1016/S0002-9394(14)71963-4
M3 - Article
C2 - 8659598
AN - SCOPUS:0029900125
SN - 0002-9394
VL - 122
SP - 53
EP - 57
JO - American Journal of Ophthalmology
JF - American Journal of Ophthalmology
IS - 1
ER -