Blurred vision is a decrease in the sharpness or clarity of sight, making objects appear hazy, out of focus, foggy, or lacking fine detail, and can affect one eye (unilateral) or both eyes (bilateral), either constantly or intermittently. It results from problems anywhere along the visual pathway, including the eye itself (e.g., refractive errors like nearsightedness, farsightedness, astigmatism, or presbyopia; cataracts causing cloudy lens; dry eyes reducing tear film quality; corneal issues like swelling, scratches, or infections), the optic nerve (e.g., optic neuritis from inflammation or multiple sclerosis), the retina (e.g., macular degeneration, diabetic retinopathy, retinal detachment), or brain-related causes (e.g., migraine aura, stroke/TIA affecting visual cortex, increased intracranial pressure). Other common triggers include fatigue, low blood sugar, medication side effects (e.g., antihistamines, antidepressants), alcohol or drug use, eye strain from prolonged screen time, uncorrected glasses/contact lens issues, or transient causes like bright light adaptation. It may occur alone or with other symptoms such as double vision, eye pain/redness, floaters/flashes, headache, dizziness, halos around lights, light sensitivity, or sudden onset signaling urgency (e.g., retinal detachment or stroke).