The purpose of gonioscopy is to determine the topography of the anterior chamber angle based on recognition of angle landmarks. Level of iris insertion, shape of peripheral iris profile, width of the angle recess, degree of trabecular pigmentation, areas of iridotrabecular apposition and areas of iridocorneal synechiae are various features must be determined when viewing an angle during gonioscopy. This chapter aims to discuss the corneal wedge, iris, iris processes, ciliary body band, scleral spur, trabecular meshwork, Schlemm’s canal, Schwalbe’s line, normal blood vessels and determination of angle width. Difficulties and artifacts in gonioscopy are also discussed in detail in this chapter.