Comparison of gonioscopy and ultrasound biomicroscopy for evaluating the iridocorneal angle in dogs
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Objective
To compare iridocorneal angle grading systems on the basis of gonioscopy and ultrasound biomicroscopy (UBM).
Design
Original cross-sectional observational study.
Animals
22 dogs.
Procedure
Gonioscopy, goniophotography, and UBM were performed on 38 eyes from dogs without clinical evidence of glaucoma in the eyes examined.
Results
Predominant gonioscopic grades derived from goniophotographs were considered normal (n = 26) and mild (12). Ultrasound biomicroscopy angle measurements ranged from 16 to 38° (mean ± SD, 26.2 ± 4.5°). Ciliary clefts depicted on UBM images were graded as open (n = 4), compact/narrow (23), and closed (11). Significant differences were not found between UBM-derived ciliary cleft grades and goniophotography-derived dysgenesis grades, nor between UBM-derived ciliary cleft grades and subjective gonioscopic grades.
Clinical Implications
Because gonioscopy allows evaluation of the anterior face of the ciliary cleft, whereas UBM provides cross-sectional information of the iridocorneal filtration angle, UBM may yield more information regarding pathogenesis and prognosis of, and preferred management approaches to, glaucoma. Ultrasound biomicroscopy may also be useful as a predictor of glaucoma or to diagnose early stages of glaucoma. (J Am Vet Med Assoc 1998;213:635-638)
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