This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'Arden index is related to \nSelect and explain. \nA. ERG (Electroretinogram), B. EOG (Electroculogram), C. VER (Visual Evoked response), D. Perimetry', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Electro-oculography is based on the measurement of resting potential of the eye which exists between the cornea (+ve) and back of the eye (-ve). Results of EOG are interpreted by finding out the Arden ratio as follows: Arden ratio = (Maximum height of light peak/Minimum height of dark trough) x 100 Normal curve values are 185 or above. Subnormal curve values are less than 150. Flat curve values are less than 125. Reference: A K KHURANA COMPREHENSIVE OPHTHALMOLOGY, Edition4 ,page-489,490', 'role': 'assistant'}]