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Madiysn has been diagnosed with visual impairments – alternating exotropia, convergence insufficiency and ptosis.

Intermittent exotropia is one form of strabismus, a disorder in which the two eyes fail to focus on the same image.

In Western countries, the most common form of strabismus is esotropia, where the eyes turn inward; about 1 percent of U.S. children have intermittent exotropia.

Still, the effects of intermittent exotropia on children's vision had not been well studied, according to the researchers on the work, led by Dr. Brian Mohney of the Mayo Clinic in Rochester, Minnesota.

For their study, the researchers reviewed the records of 135 children who were diagnosed with intermittent exotropia between 1975 and 1994.