You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Earliest sign in visual field suggestive of glaucoma: and explain in detail?
Isopter contraction is earliest sign of glaucoma though it is not very specific. High Yield points regarding visual fields Isopters : degrees of visual field. A normal visual field extends approximately 100deg temporally (laterally), 60deg (nasally), 60deg (superiorly), and 70deg (inferiorly). A physiologic scotoma (a blind spot) exists at 15deg temporally where the optic nerve leaves the eye.. Earliest field defect in glaucoma is isopter contraction f/b baring of blind spot. Earliest specific defect is paracentral scotoma > Seidel scotoma. NOTE- in PAOG there is no expansion of blind spot. other conditions where blind spot expansion is seen are - Papilledema Optic nerve hypoplasia.