Ocular hypertension is when the internal eye pressure exceeds normal levels; it is more common in African Americans, those over 40, or with a family history of glaucoma. Diabetes and severe nearsightedness also increase the risk.
Ocular migraine refers to migraine subtypes with visual disturbances like blind spots or zigzag lines. Unlike other migraines, it can occur without head pain.
Peripheral vision, or side vision, allows detection of objects and motion around without eye movement.