They also may close one eye when viewing at distance or in bright sunlight. People with intermittent exotropia may experience headaches, difficulty reading and eye strain. The eyes may point beyond the object being viewed. Intermittent exotropia may develop when a person cannot coordinate both eyes together. Symptoms of accommodative esotropia may include seeing double, closing or covering one eye when doing close work, and tilting or turning the head. People who are farsighted are focusing extra hard to keep images clear. The eye's focusing system is linked to the system that controls where the eyes point. Accommodative esotropiaĪccommodative esotropia often occurs because of uncorrected farsightedness ( hyperopia). Many types of strabismus can develop in children or adults, but the two most common forms are below. People with conditions such as Down Syndrome and cerebral palsy or who have suffered a stroke or head injury are at a higher risk for developing strabismus. People who have a significant amount of uncorrected farsightedness (hyperopia) may develop strabismus because of the additional eye focusing they must do to keep objects clear. People with parents or siblings who have strabismus are more likely to develop it. Risk factors for developing strabismus include: It can also develop due to other general health conditions or eye injuries. Strabismus can be caused by problems with the eye muscles, the nerves that transmit information to the muscles, or the control center in the brain that directs eye movements. If the turning eye is sometimes the right eye and other times the left eye (alternating).Whether it always involves the same eye (unilateral).The frequency with which it occurs (either constant or intermittent).Other classifications of strabismus include: Strabismus is classified by the direction the eye turns: A doctor of optometry should examine any child older than 4 months whose eyes do not appear to be straight all the time. In fact, strabismus may get worse without treatment. People often believe that a child with strabismus will outgrow the condition. But older children and adults can also develop the condition. Strabismus usually develops in infants and young children, most often by age 3. Usually, the appearance of crossed eyes will go away as the baby's face begins to grow. The appearance of crossed eyes may be due to extra skin that covers the inner corner of the eyes or a wide bridge of the nose. This is a condition called pseudostrabismus or false strabismus. Some babies' eyes may appear to be misaligned, but they are actually both aiming at the same object. This condition is called amblyopia or lazy eye. Untreated, eye turning can lead to permanently reduced vision in one eye. But over time the brain will learn to ignore the image from the turned eye. At first, this may create double vision and confusion. When the eyes are misaligned, the brain receives two different images. Proper eye alignment is important to avoid seeing double, for good depth perception, and to prevent the development of poor vision in the turned eye. In other cases, the eyes may alternate turning. In some cases, the same eye may turn each time. The eye turning may occur all the time or may appear only when the person is tired, ill, or has done a lot of reading or close work. When problems develop with eye movement control, an eye may turn in, out, up or down. Normally, the eyes work together so they both point at the same place. The muscles receive signals from the brain that direct their movements. Six muscles attach to each eye to control how it moves.
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