This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Earliest visual field change in open angle glaucoma is – 
Select and explain. 
A. Paracentral scotoma, B. Ring scotoma, C. Siedel's scotoma, D. Arcuate scotoma
A: Paracentral scotoma
Answer: A: Paracentral scotoma 
Explanation: Earliest clinically significant field defect is small wing-shaped paracentral scotoma.