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the evaluation of glaucoma

The angle between the posterior surface of the cornea and the anterior surface of the iris constitutes the anterior chamber (AC) angle It was first visualized in 1907 by Trantas by indentation of the limbus in a case of keratoglobus, but only in 1914 did Salzmann describe the first gonioscopy lens, which has undergone modifications over the years until the introduction in 1968 by Goldmann of the gonioprism we use today.

The classification of the ACangle was first suggested by Barkan in 1938.

According to its amplitude, glaucoma can be classified into two groups: open angle or closed angle.1

Aqueous humour (AH) drainage is done through the trabecular fibrillar structure and the lumen of the Schlemm’s canal that occupy the vertex of the ACangle.

Access of AH to these structures may be limited in different situations, resulting in an increase of intraocular pressure (IOP), which may be abrupt or insidious.

The eyes most susceptible to abrupt elevations of IOP are those that are anatomically smaller, usually hyperopic, in which the structures are closer and generally showing an anterior deviation, creating conditions for angular blockade 2,3,4,5.


The gonioscopy is the analysis of the anterior chamber (AC) angle.