Vision problems

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Cataract	Cataract - close-up of the eye	Crossed eyes	Eye
Slit-lamp exam	Visual acuity test	Visual field test

Vision impairment; Impaired vision; Blurred vision

Changes in vision, blurriness, blind spots, halos around lights, or dimness of vision should always be evaluated by a medical professional. Such changes may represent an eye disease, aging, eye injury, or a condition like diabetes that affects many organs in your body.

Whatever the cause, vision changes should never be ignored. They can get worse and significantly impact the quality of your life. Professional help is always necessary. As you determine which professional to see, the following descriptions may help:

• Opticians dispense glasses and do not diagnose eye problems.
• Optometrists perform eye exams and may diagnose eye problems. They prescribe glasses and contact lenses. In some states they prescribe eye drops to treat diseases.
• Ophthalmologists are physicians who diagnose and treat diseases that affect the eyes. These doctors may also provide routine vision care services, such as prescribing glasses and contact lenses.
• Sometimes an eye problem is part of a general health problem. In these situations, your primary care provider should also be involved.

Vision changes and problems can be caused by many different conditions:

• Presbyopia -- difficulty focusing on objects that are close. Common in the elderly.
• Cataracts -- cloudiness over the eye's lens, causing poor nighttime 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's 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 TIA .
• 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.