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
[{'content': 'Which of the following statements is true regarding the given investigation? \nSelect and explain. \nA. It is a type of manual perimetry, B. A kinetic stimulus is used, C. Stimulus brightness is constant, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PERIMETRY :-Systematic measurement of the visual field. - Normal visual field: From the point of fixation, stimuli can typically be detected 60deg superiorly, 70deg inferiorly, 60deg nasally and 100deg temporally. Automated: Automated perimetry offers obvious advantages like stimulus presentation, as well as the recording of patient responses, can be standardized, leading to more reproducible results. Humphrey and Octopus are automated perimeters', 'role': 'assistant'}]