Binocular vision impairments often result in partial or total loss of stereoscopic vision and binocular depth perception. Conditions where the eye is obviously turned or crossed are commonly referred to with terms like "cross-eyed", "crossed-eyes", wall-eyes" or "wandering eyes". These binocular vision impairments are easily detected by others as all the observer needs to do is notice that both eyes do not aim in the same direction at all times. Some medical terms for these deviations or misalignments of the eye are strabismus, esotropia, exotropia, congenital strabismus, hereditary strabismus, pediatric strabismus, adult strabismus, accommodative esotropia, alternating esotropia, congenital esotropia, accommodative esotropia, esophoria, exophoria, exotropia, exotropic, esotropic, hyperphoria, hypophoria, hyperphoria, hypertropia. Other medical conditions which can contribute to poor binocular vision are anesmetropia, astigmatism, nearsightness, myopia, farsightedness, hyperopia, nystagmus, cerebral palsy, cataracts.
PLEASE NOTE: Some binocular vision impairments are not easily detected by parents, teacher or others because the turning or straying of the eye(s) is NOT obvious or consistent. Some eye turns are intermittent (they come and go) and/or they are not easily noticed by the untrained observer. A binocular vision problem is indicated, even when an eye turn is only occasionally visible. That's why early examination is so important.
Has your child been given different prescriptions for his or her two eyes? It is important to note that binocular vision is often impaired when the vision in the two eyes is significantly different or if one eye is higher than the other. The wearing of prescription glasses ONLY will rarely correct poor binocular vision.
Binocular vision impairments are more common than you may think. Just one type of binocular impairment, amblyopia ("lazy eye"), affects approximately 3% of the population. At least 12% of the population has some type of problem with binocular vision. Plenty of people are seeing the world with only one eye. They are monocular (one-eyed), not binocular (two-eyed). (Remember the monocles that people used to wear in the nineteenth century?)
Many monocular people can be rehabilitated with the help of Vision Therapy. They can become binocular and gain depth perception! children-special-needs.org seeks to call attention to binocular vision impairments and to educate parents and the public about treatment options. Many parents of children with these visual defects are not informed of all treatment options and are not gaining information about and access to Vision Therapy, a treatment option that offers a much higher success rate than eye muscle surgery.