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
Worth 4 dot test is done for: 
Select and explain. 
A. Color deficiency, B. Strabismus, C. Binocular vision, D. Squint
C: Binocular vision
Answer: C: Binocular vision 
Explanation: Ans. (c) Binocular visionRef: A.K. Khurana 6th ed. 1342* Worth four dot test (WFDT) is a test for binocular vision using red-green color dissociation.* It is a dissociation test which can be used with both distance and near fixation and differentiate between binocular single vision, abnormal retinal correspondence and suppression.* NOTE: result of WFDT can only be interpreted if the presence or absence of manifest squint is known at the time of testing.