vision (especially while reading), metamorphopsia (seeing straight lines as wavy), and colors appearing faded. Macular degeneration is the third main cause of blindness worldwide, and is the main cause of blindness in industrialised countries. Eye infection, inflammation, or injury. Sjögren's syndrome, a chronic autoimmune inflammatory disease that destroys moisture producing glands, including lacrimal gland and leads to dry eye and visual blur. Floaters: Tiny particles drifting across the eye. Although often brief and harmless, they may be a sign of retinal detachment. Retinal detachment: Symptoms include floaters, flashes of light across your visual field, or a sensation of a shade or curtain hanging on one side of your visual field. Optic neuritis: Inflammation of the optic nerve from infection or multiple sclerosis may cause blurring of vision. There may be pain while moving the eye or touching it through the eyelid. Stroke or transient ischemic attack Brain tumor Toxocara: A parasitic roundworm that can cause blurred vision. Bleeding into the eye Temporal arteritis: Inflammation of an artery in the brain that supplies blood to the optic nerve. Migraine headaches: Spots of light, halos, or zigzag patterns are common symptoms prior to the start of the headache. A retinal migraine is when you have only visual symptoms without a headache. Reduced blinking: Lid closure that occurs too infrequently often leads to irregularities of the tear film due to prolonged evaporation, thus resulting in disruptions in visual perception. Carbon monoxide poisoning: Reduced oxygen delivery can affect many areas of the body including vision. Other symptoms caused by CO include vertigo, hallucination and sensitivity to light. References Disorders of ocular muscles, binocular movement, accommodation and refraction