This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Techniques of Ocular Examination and Diagnostic Tests, Subject name: Ophthalmology
Gonioscopy is used to study: 
Select and explain. 
A. Anterior chamber, B. Posterior chamber, C. Angel of anterior chamber, D. Retina
C: Angel of anterior chamber
Answer: C: Angel of anterior chamber 
Explanation: Ans: C (Angel of anterior chamber) Ref: Kanski. Cliniccd Ophthalmology 6th edition: PS- 11Explanation:GONIOSCOPY - To study the angle of the anterior chamber:Structures: From anterior to posteriorS - Schwalbe lineT - trabecular mesh workS - sclera spurC - ciliary bodyUses:Diagnostic - Abnormal angle structure , estimation of the width of the chamber angle.Surgical gonioscopy - While doing goniotomy, laser trabeculoplasty.Types of Lenses:Direct - Gonioprism - Direct view of the angle - KOEPPE LENS.Indirect - Goniomirror - Image of the opposite angle - GGLDMANN, ZEISS, POSNER and SUSSMAN.