This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
Which of the following procedures does not need dilatation of the pupil? 
Select and explain. 
A. Laser inferometry, B. Retionoscopy, C. Fundus examination, D. Gonioscopy
D: Gonioscopy
Answer: D: Gonioscopy 
Explanation: Ans. (d) GonioscopyRef: Khurana 4/e, p. 546Gonioscopy is examination of the anterior chamber angles. In it pupil dilation is not needed, in fact dilation of the pupil can hamper proper visualization of the angle structures.All other options need pupil dilation (although they can also be done without dilation)