A brief historical review of gonioscopy since the pioneering works published by Trantas and Salzmann is presented. The techniques of examination are described and the advantages and disadvantages of each one are discussed. Based on the classifications in the literature, a new one is proposed: the APIC classification. In this classification each one of the elements of the anterior chamber angle are graduated: A = anterior chamber angle Amplitude; P = Pigmentation; I = iris Implantation; and C = iris Configuration.
Gonioscopy; Gonioscopy; Anterior chamber; Trabecular meshwork; Iris; Pigmentation
