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
Field defect in open angle glaucoma is best detected by? 
Select and explain. 
A. Humphrey field perimeter, B. Goldman perimeter, C. Listers perimeter, D. Bjerrum screen
A: Humphrey field perimeter
Answer: A: Humphrey field perimeter 
Explanation: Diagnosis of glaucoma field defect is best done by Humphrey field perimeter(Gold standard). EARLIEST VISUAL FEILD DEFECT- PARA CENTRAL SCOTOMA Visual feild is defined as area if space visible to human eye without moving the eye fro central target. Rule of thumb:Earliest visual field defect in glaucoma always begin from close to center i.e Paracentral > Bjerrum > Generalized constriction. Extra edge: In Glaucoma, Temporal visual field is the last visual field to be affected.