Canis ISSN: 2398-2942

Eye: gonioscopy

Synonym(s): Examination of iridocorneal drainage angle

Contributor(s): David Gould, Natasha Mitchell

Introduction

  • Gonioscopy describes the examination of the iridocorneal drainage angle (ICA) of the eye using a goniolens and a focal light source.

Uses

  • Gonioscopy is primarily used in dogs to identify predisposition to primary glaucoma Glaucoma. It is used to assess the anatomy of the ICA, specifically to determine whether the opening to the ciliary cleft is open, narrow or closed and to assess whether there is dysplasia of the pectinate ligaments which span the entrance to the ciliary cleft. Pectinate ligament dysplasia (PLD) is termed goniodysgenesis. A narrow or closed angle and/or the presence of PLD is thought to increase the risk of development of primary closed angle glaucoma.

Advantages

  • Gonioscopy is the only clinical diagnostic method available that allows direct visualization of the ICA to allows the clinician to determine predisposition to primary hereditary glaucoma in dogs.

Disadvantages

  • The technique requires some expertise, and experience of both normal and abnormal ICA appearance is required. Gonioscopy is usually considered a specialist technique to be performed by veterinary ophthalmologists.

Requirements

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Preparation

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Procedure

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Aftercare

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Further Reading

Publications

Refereed papers

Other sources of information

  • Renwick P (2002)Glaucoma.In:BSAVA Manual of Ophthalmology. Eds S Petersen-Jones, S Crispin. BSAVA Publications, Gloucester, 2002, 185-203.

Organisation(s)


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