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 statements is true regarding the given investigation? 
Select and explain. 
A. It is a type of manual perimetry, B. A kinetic stimulus is used, C. Stimulus brightness is constant, D. All of the above
C: Stimulus brightness is constant
Answer: C: Stimulus brightness is constant 
Explanation: 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