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Esotropia is a form of eye misalignment where one eye looks ahead and the other turns just before the nose. It is an ordinary state in newborns as less than one quarter of babies are born with both eyes facing straight ahead. The eyes usually come into the proper position over the next three months as the two eyes begin to work together.
Esotropia is a form of strabismus, or "squint", in which one or both eyes turns inward. The state can be always present, or take place occasionally, and can give the affected individual a "cross-eyed" appearance. Esotropia is at times incorrectly called "lazy eye", which describes the situation of amblyopia - a decline in vision of one or both eyes which is not the result of any pathological injury of the visual pathway and which cannot be determined by the use of corrective lenses. Amblyopia , though, happen as a result of esotropia happening in childhood: In order to reduce symptoms of diplopia or double vision, the child's brain will pay no attention to or "suppress" the image from the esotropic eye, which when allowed continuing untreated will lead to the development of amblyopia.
Treatment options for esotropia include glasses to correct refractive errors, the use of prisms and/or orthoptic exercises and/or eye muscle surgery.
How to detect Esotropia?
In some cases, esotropia is not self-correcting but in fact becomes inferior. Childhood esotropia usually develops over the first six months and affects about 1 percent of full-term newborns. It might happen during transient episodes, causing a delay in the diagnosis.
Determine the alternate prism test to measure the angle of difference in the eyes. An angle of deviation greater than 20 prism diopters is considered to be infantile esotropia. Patients that have a deviation between 20 and 40 have a little chance of resolving the esotropia, but a deviation of greater than 40 prism diopters will not often resolve itself.
Check for amblyopia, which should be powerfully suspected in cases of infantile esotropia, particularly in the crossed eye.
Verify for extra ocular motor signs such as impaired binocularity, incomitance and scotomas. Patients that achieve an almost usual alignment within the first two years almost certainly have regular sensory and motor functions.
Look for additional underlying causes of infantile esotropia. It has been associated with a greater likelihood of craniofacial, neurologic and ocular abnormalities. A host of other problems also can cause esotropia.
Treatment for Esotropia -
1. Identify and treat any primary systemic situation.
2. Recommend any glasses necessary and allow the patient time to 'settle into' them.
3. Use occlusion to cure any amblyopia there and give confidence alternation.
4. Where appropriate, orthoptic workout can be used to try to re-establish binocularity.
5. Where appropriate, prismatic correction can be used, either for the short term or everlastingly, to relieve symptoms of double vision.
6. In specific cases, and primarily in adult patients, Botulinum Toxin can be used either as a permanent beneficial approach, or as a temporary measure to prevent contracture of muscles earlier to surgery
7. Where essential, extra-ocular muscle surgery can be undertaken to recover cosmesis and, on occurrence, re-establish binocularity.
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