Clinical features distinguishing angle closure from pseudoplateau versus plateau iris

Authors

S Shukla, University of Western Ontario, London, Canada
Karim F. Damji, University of Ottawa Eye Institute, CanadaFollow
P Harasymowycz, University of Montreal, Montreal, Canada
D Chialant, University of Ottawa Eye Institute, Canada
J S. Kent, University of Saskatchewan, Saskatoon, Canada
R Chevrier, University of Ottawa Eye Institute, Canada
R Buhrmann, University of Ottawa Eye Institute, Canada
D Marshall, University of Ottawa Eye Institute, Canada
Y Pan, University of Ottawa Eye Institute, Canada
W Hodge, University of Ottawa Eye Institute, Canada

Document Type

Article

Department

Ophthalmology

Abstract

Purpose: To evaluate clinical aspects of patients with the diagnosis of plateau iris (PI) or pseudoplateau iris (PPI) made by ultrasound biomicroscopy (UBM) in order to determine if there are any clinical factors that can help differentiate between these two entities.
Method: A retrospective cohort of consecutive UBM patients with the diagnosis of PI or PPI. The diagnosis of PI was based on an anteriorly positioned ciliary body that abutted the peripheral iris, a narrow (<10 degrees) or closed angle for at least 180 degrees, and the anterior portion of the iris positioned anterior to scleral spur. The diagnosis of PPI was similar to plateau except that large or a cluster of small cysts had to be present in the iridociliary sulcus.
Results: There were a total of 76 patients (29% male), 21 with PPI and 55 with PI. Patients with PPI were more likely to be male (p = 0.005), slightly younger (51.5 (SD 10.7) vs 57.9 (10.2) p = 0.0190), have a "bumpy" peripheral iris appearance (p = 0.003), have greater trabecular meshwork pigmentation (2.0 (0.7) vs 1.3 (0.6) p = 0.004) and have fewer clock hours of gonioscopic angle closure versus plateau iris patients (5.1 (4.3) vs 9.2 (4.2) p = 0.0009). Spherical equivalent was not significantly different between groups (0.50D (1.69) PPI vs 1.33D (2.42) PI; p = 0.187).
Conclusions: In patients being referred to a UBM clinic for evaluation of angle-closure mechanism, younger males with a bumpy peripheral iris have a higher likelihood of having a diagnosis of pseudoplateau iris. However, clinical factors do not appear to discriminate well between PPI and PI. UBM is extremely helpful in confirming underlying mechanism and guiding therapy.

Comments

This work was published before the author joined Aga Khan University.

Publication (Name of Journal)

British Journal of Ophthalmology

Recommended Citation

Shukla, S., Damji, K. F., Harasymowycz, P., Chialant, D., Kent, J. S., Chevrier, R., Buhrmann, R., Marshall, D., Pan, Y., Hodge, W. (2008). Clinical features distinguishing angle closure from pseudoplateau versus plateau iris. British Journal of Ophthalmology, 92(3), 340-344.
Available at: https://ecommons.aku.edu/pakistan_fhs_mc_ophthalmol/81