This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Squint, Subject name: Ophthalmology
Which of the following is used to depict the actions of extraocular muscles 
Select and explain. 
A. Goldman three mirror, B. Hess Cha, C. Humphrey field, D. Octopus fiels
B: Hess Cha
Answer: B: Hess Cha 
Explanation: Hess chaing is done to depict the action of extra ocular muscle Goldman three mirror-Peripheral retina is best examined with indirect ophthalmoscopy and by the use of Goldman three mirror contact lens. Humphrey field-automated Perimetry. Octopus field-semi-automated kinetic perimetry