Evaluation and comparison of indentation ultrasound biomicroscopy gonioscopy in relative pupillary block, peripheral anterior synechia, and plateau iris configuration.
OBJECTIVE
To evaluate and compare the findings and changes of the anterior chamber angle configuration with indentation ultrasound biomicroscopy (UBM) gonioscopy in relative pupillary block (RPB), peripheral anterior synechia (PAS), and plateau iris configuration (PIC).


METHODS
This study included 73 eyes of 52 patients with RPB (n = 26), PAS (n = 21), or PIC (n = 26). First, a conventional UBM scan was performed using a normal size standard eye cup before indentation. Then, for indentation UBM gonioscopy, scans were performed using a new eye cup that we designed. For evaluation of the angle, angle opening distance 500 and angle recess area were recorded and evaluated with regard to the effect of expansion on the anterior chamber angle.


RESULTS
Indentation UBM gonioscopy showed the characteristic images in each of the eyes. The angle of all examined eyes was significantly widened with indentation (P < 0.01). The angle changes in eyes with RPB were significantly greater than in eyes with PAS or PIC (P < 0.01).


CONCLUSIONS
Indentation UBM gonioscopy is a very useful method for observing the angle and diagnosis of RPB, PAS, and PIC.
Matsunaga
Koichi
K
Department of Ophthalmology, Mie University School of Medicine, Japan.
Ito
Kunio
K
Esaki
Koji
K
Sugimoto
Kota
K
Sano
Toru
T
Miura
Katsuya
K
Sasoh
Mikio
M
Uji
Yukitaka
Y
D000368:Aged; D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D004867:Equipment Design; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000000981:diagnostic imaging*; D006068:Gonioscopy / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007499:Iris Diseases / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011681:Pupil Disorders / Q000000981:diagnostic imaging*; D014463:Ultrasonography