BODY SIGNAL ALERT VISION, SUDDEN CHANGE OF IN ONE EYE
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Description and Possible Medical Problems
Gradual changes in your eyesight may be a symptom of aging or an easily treated problem with the eye itself. Sometimes, however, your eyesight will suddenly worsen—for instance, you may not be able to see the entire left side of your field of vision while you’re looking straight ahead. If this happens, you may have a headache or vertigo or may be slurring your speech or be unable to use an arm or leg—or both—on the same side of the body. This is usually an indication of a vascular injury to the brain, such as a stroke, and you should see your doctor immediately.
Several parts of the brain that enable you to see are located in different parts of the organ. One part of the brain, called the frontal eye field area, which is located just above the frontal lobe, controls your field of vision. A pair of cranial nerves that jut out from the brain stem helps to control eye movement. A small part of the btain called the primary visual area, which is located at the very back of the brain behind the occipital lobe, processes the pictures the optic nerve sends it. A trauma that affects any of these parts can cause you suddenly to lose your sight.
In some cases, however, a small stroke that causes an interruption of the blood flow to one eye can cause sudden blindness in that same eye. This is called amaurosis fugax, and it is most often caused by the nat-rowing of the carotid arteries. This condition appears frequently in people in their mid- to late 60s who are heavy smokers.
Treatment
Because there are many cerebral problems that may be responsible for a sudden loss of vision, you need to see your doctor right away. A slow-growing brain tumor could be putting pressure on one of the parts of the brain that influences your eyesight. A trauma or blow to the skull can also cause you to lose part or all of your vision in both eyes for a few days.
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