Comparison of gonioscopy and ultrasound biomicroscopy for evaluating the iridocorneal angle in dogs

Terri E. Gibson From the Departments of Clinical Sciences (Gibson, Roberts, Severin) and Radiological Health Sciences (Steyn, Wrigley), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523.

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 DVM, MS
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Steven M. Roberts From the Departments of Clinical Sciences (Gibson, Roberts, Severin) and Radiological Health Sciences (Steyn, Wrigley), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523.

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 DVM, MS
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Glenn A. Severin From the Departments of Clinical Sciences (Gibson, Roberts, Severin) and Radiological Health Sciences (Steyn, Wrigley), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523.

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 DVM, MS
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Phillip F Steyn From the Departments of Clinical Sciences (Gibson, Roberts, Severin) and Radiological Health Sciences (Steyn, Wrigley), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523.

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 BVSc, MS
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Robert H. Wrigley From the Departments of Clinical Sciences (Gibson, Roberts, Severin) and Radiological Health Sciences (Steyn, Wrigley), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523.

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 BVSc, MS, DVR

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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)

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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