The effect of laser iridotomy on the anterior segment anatomy of patients with plateau iris configuration.
OBJECTIVE
To determine if laser iridotomy altered the anterior segment anatomy of patients with plateau iris configuration.


METHODS
Twenty eyes of 9 female and 1 male patients were imaged using an ultrasound biomicroscope within 19 weeks before and 52 weeks after laser iridotomy. Measurements obtained included the anterior chamber depth (ACD), trabecular-ciliary process distance (TCPD), iris thickness (IT), angle opening distance at 500 micrometers (AOD), iridozonular distance (IZD), and trabecular-iris angle (TIA). Comparisons of the pre- and post- iridotomy measurements were made using a two-tailed paired t test.


RESULTS
Laser iridotomy elicited no statistically significant change in ACD, TCPD, IT, AOD, or TIA. However, IZD was decreased (P < 0.05) in both eyes after laser iridotomy. Configuration of the irides was flat before and after laser iridotomies.


CONCLUSIONS
This study suggests that laser iridotomy did not alter anterior segment anatomy, probably because of the fixed anterior insertion of the iris and ciliary body in plateau iris configuration. The decrease in IZD distance may be the result of a small posterior movement of the iris due to a reduction in relative pupillary block, secondary to laser iridotomy. The small reduction in relative papillary block in plateau iris configuration does not alter the width of the anterior chamber angle as measured by AOD and TIA.
Polikoff
Lee A
LA
Department of Ophthalmology, The Mount Sinai School of Medicine, New York, New York 10029, USA.
Chanis
Raul A
RA
Toor
Ashish
A
Ramos-Esteban
Jerome C
JC
Fahim
Magid M
MM
Gagliuso
Donna J
DJ
Serle
Janet B
JB
D000328:Adult; D000368:Aged; D000869:Anterior Eye Segment / Q000000981:diagnostic imaging / Q000473:pathology*; D002924:Ciliary Body / Q000000981:diagnostic imaging / Q000473:pathology; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure; D032801:Iridectomy / Q000379:methods*; D007499:Iris Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D053685:Laser Therapy; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014463:Ultrasonography; D014792:Visual Acuity