This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Ophthalmology
This test is used in:- 
Select and explain. 
A. Squint, B. Heterophoria, C. Esotropia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The above diagram shows cover uncover test used for squint diagnosis(both tropias and phorias). Interpretation of cover, cover-uncover and alternate cover tests.