Blurred vision

Blurred vision is an ocular symptom.

Causes
There are many causes of blurred vision:


 * Use of atropine or other anticholinergics


 * Presbyopia -- Difficulty focusing on objects that are close. Common in the elderly. (Accommodation tends to decrease with age.)


 * Cataracts -- Cloudiness over the eye's lens, causing poor night-time vision, halos around lights, and sensitivity to glare. Daytime vision is eventually affected. Common in the elderly.


 * Glaucoma -- Increased pressure in the eye, causing poor night vision, blind spots, and loss of vision to either side. A major cause of blindness. Glaucoma can happen gradually or suddenly—if sudden, it is a medical emergency.


 * Diabetic retinopathy -- This complication of diabetes can lead to bleeding into the retina. Another common cause of blindness.


 * Macular degeneration -- Loss of central vision, blurred vision (especially while reading), distorted vision (like seeing wavy lines), and colors appearing faded. The most common cause of blindness in people over age 60.


 * Eye infection, inflammation, or injury.


 * 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. You may have pain when you move your eye or touch it through the eyelid.


 * Stroke or Transient ischemic attack


 * Brain tumor


 * 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. An ophthalmic migraine is when you have only visual symptoms without a headache.

Blurred vision may be a systemic sign of local anaesthetic toxicity


 * 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.