Blurred vision refers to a lack of sharpness of vision resulting in the inability to see fine detail. Blurred vision may result from abnormalities such as nearsightedness, farsightedness, presbyopia, or astigmatism that can be improved with corrective lenses (eyeglasses) or it may signal the presence of eye disease. Blurry vision may be experienced in one eye or in both eyes, depending upon the cause. Blurred vision can also be a symptom of numerous conditions that do not directly involve the eye, such as migraine or stroke. A number of medications may also lead to temporary blurring of vision as a side effect. Sometimes, blurred vision is associated with other symptoms, depending upon its cause, including headache, sensitivity to light, or redness and irritation of the eyes.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.
Causes of Blurred Vision
14 Signs and Symptoms of Stroke (FAST)
Stroke is a serious medical condition. If you think you or someone you know is having a stroke call 911 immediately. There...
Acanthamoeba is an amoeba that lives in dust, soil, and fresh, sea, and brackish water. Acanthamoeba keratitis causes eye pain, a...
Acanthamoeba infection of the eye can cause Acanthamoeba keratitis, a serious infection that may result in permanent vision loss...
Astigmatism is an eye condition in which the cornea is abnormally curved and causes out-of-focus vision. Symptoms of astigmatism...
Botulism is an illness caused by a neurotoxin produced by the bacterium Clostridium botulinum. There are three types of botulism:...
Cancers that form from brain tissue are called primary brain tumors. Brain tumors may be malignant (brain cancer) or benign....
Brain Tumor (Symptoms, Signs, Types, Causes, Survival Rates)
A brain tumor can be either non-cancerous (benign) or cancerous (malignant), primary, or secondary. Common symptoms of a primary...
A cataract is an eye disease that causes the eye's lens to become cloudy and opaque with decreased vision. Causes of cataracts...
The cornea is the clear outer layer of the eye. If it is damaged by disease, infection, or injury, vision problems may occur....
A corneal ulcer is an open sore on the cornea. Infection is a common cause of corneal ulcer. Symptoms and signs of corneal ulcer...
Cytomegalovirus (CMV) is a virus that is spread from person to person via spit, semen, vaginal secretions, urine, blood, sexual...
Diabetes and Eye Problems
Diabetes and eye problems are generally caused by high blood sugar levels over an extended period of time. Types of eye problems...
Dry eyes are caused by an imbalance in the tear-flow system of the eye, but also can be caused by the drying out of the tear...
Eye strain is a symptom caused by looking at something for a long time. Symptoms and signs include redness, light sensitivity,...
Farsightedness makes it difficult to focus on objects that are close up. The condition runs in families and occurs because light...
Glaucoma is a common eye condition in which the fluid pressure inside the eye rises because of slowed fluid drainage from the...
Herpes Viral Infections of the Eye
Herpes of the eye occurs due to herpes simplex virus-1 (HSV-1). Symptoms of herpes of the eye include pain in and around the eye,...
Iritis is inflammation of the iris, the colored portion of the eye. Symptoms include a red, painful eye, blurry vision, and light...
Keratitis is inflammation of the cornea. Symptoms and signs include pain, tearing, blurred vision, eye redness, watery eyes, or...
Keratoconus is a condition in which the cornea bulges outward like a cone. The cause of the condition is unknown, but genetics...
Age-related macular degeneration (AMD) is a disease that gradually destroys the central vision. In people over 60, AMD is a...
Migraine headache is a type of headache associated with a sensitivity to light, smells, or sounds, eye pain, severe pounding on...
Multiple Sclerosis (MS) Symptoms, Causes, Treatment, Life Expectancy
Multiple sclerosis or MS is an autoimmune disorder in which brain and spinal cord nerve cells become demyelinated. This damage...
Myasthenia gravis, a chronic autoimmune neuromuscular disease. Varying degrees of weakness of the voluntary muscles of the body...
Myopia, or nearsightedness, makes it difficult to focus on objects that are far away. The condition runs in families and occurs...
Ocular Melanoma (Intraocular Melanoma or Uveal Melanoma)
Ocular melanoma is cancer that begins in the eye tissue. Risk factors include being Caucasian, older age, having light eyes and...
Optic neuritis is inflammation of the optic nerve, the structure that connects the eye to the brain. The precise cause of optic...
Presbyopia is the age-related loss of the ability to focus on objects that are close up. The condition generally affects people...
Retinal detachment is the separation of the retina from its attachments to the underlying eye tissue. Symptoms of retinal...
Scleritis is inflammation of the white part of the eye. It may be caused by a serious underlying condition, such as an autoimmune...
Stroke (Signs, Symptoms, Warning Signs)
A stroke is an interruption of the blood supply to part of the brain caused by either a blood clot (ischemic) or bleeding...
Temporomandibular Joint Syndrome (TMJ)
Temporomandibular joint (TMJ) syndrome is a disorder that causes symptoms like pain, clicking, and popping of the jaw. TMJ is...
Tension Headache (Symptoms, Relief, Causes, Treatment)
A tension headache s one of the most common types of headaches, and the exact cause is not known. Factors that may contribute to...
Toxoplasmosis (toxo) is a parasitic infection that causes flu-like symptoms, swollen lymph nodes, and muscle aches and pains that...
Transient Ischemic Attack (TIA, Mini-Stroke)
When a portion of the brain loses blood supply, through a blood clot or embolus, a transient ischemic attack (TIA, mini-stroke)...
Tuberous Sclerosis Complex (TSC)
Tuberous sclerosis complex (TSC) is a rare genetic disease caused by defects on two genes. The signs and symptoms of TSC vary...
Uveitis is inflammation of the eye. Symptoms include blurred vision, eye pain, eye redness, photophobia, and floaters. Treatment...
Other Causes of Blurred Vision
- Bleeding Into the Eye
- Convergence Insufficiency
- Corneal Abrasion
- Eye Infection
- Foreign Body in the Eye
- Incorrect Eyeglass Prescription
- Lens Dislocation
- Trauma to the Eye or Head