Double Vision

What is double vision?

Double vision, also known as diplopia, occurs when you see objects duplicated in your vision rather than a single clear representation of each object. Double vision may be temporary or permanent. Double vision can be due to a number of different events or conditions ranging in severity from a minor concern to one that is serious or life threatening.

Double vision may originate as a problem in one eye or both. If it occurs in one eye, it is usually caused by problems with the eye’s optical system. For example, corneal scarring or cataract may split or double the image you perceive.

A major cause of double vision involving both eyes is misalignment of the eyes such that they cannot focus equally on an object. This type of double vision can occur in young children whose eyes are misaligned from birth. It can also occur later in life if injury or disease affects the ability of the eye muscles to work together properly. For example, alcohol intoxication can result in temporary double vision. Serious causes of double vision include brain tumors and multiple sclerosis, a disease that affects the brain and spinal cord causing weakness, coordination, balance difficulties, and other problems.

Because the causes of double vision are so varied and can range from minor to life threatening, it is important to contact your health care provider promptly for diagnosis of your double vision and treatment of the underlying cause.

Occasionally double vision can be a sign of a medical emergency. Seek immediate medical care (call 911) if you experience double vision along with other serious symptoms, including sudden loss of or change in vision, sudden loss of coordination, change in level of consciousness or alertness, such as passing out or unresponsiveness, severe headache, sudden weakness or numbness on one side of the body, or eye pain.

Seek prompt medical care for diagnosis of the underlying cause of your double vision, or if your symptom of double vision is persistent or recurrent.