mirrored contact lens (goniolens), used with slit lamp biomicroscopy, or a contact prism lens (gonioprism) which enables observation of the anterior chamber angle
allows the examination of the anterior chamber angle using a gonioscope to observe angle structures and estimate depth of angle
measures the angle between the anaesthetised cornea and the iris
assesses whether the glaucoma is open or closed angle
procedure is painless - however some patients find it difficult to tolerate and the procedure is then limited by blepharospasm
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