Periodic esotropia?

summary

Periodic esotropia is a kind of strabismus with obvious regularity, which occurs alternately with orthotropia (or slight esotropia). When a patient with strabismus pays attention to an object, the image of the object falls on the fovea of the retina in the normal eye, while the strabismus eye falls outside the fovea. Periodic esotropia? Let's talk about it

Periodic esotropia?

The general cycle is 48 hours, that is to say, the patient's eyes present esotropia one day, and a few patients present 72 hours or 96 hours one cycle. The diopter of patients with periodic esotropia is generally about + 2.00d. Wearing glasses or not has nothing to do with the change of eye position, but the fusion can be obtained. The AC / a ratio can be higher than normal.

In the presence of strabismus, more large angle esotropia, generally in 30 °～ forty °（ Or 40 °～ fifty °）， Some cases may have mild V sign. The movement of eyeball is not limited, but it can be manifested as medial rectus hyperfunction.

The vision is normal. When strabismus, there is no binocular monoclopia or stereopsis, and some cases may have diplopia when strabismus. There are two kinds of different situations when strabismus is in orthotropia: one is in full orthotropia, when binocular monoclopia and stereopsis are completely normal, and there is physiological diplopia; The other is that the patient's eyes are not in full ortho position, but show small angle esotropia, but still correspond to the normal retina.

matters needing attention

In principle, the timing of surgery should be changed to constant strabismus before surgery, but in some cases, the periodicity has been maintained for more than several years. Most of the surgical methods are internal rectus recession or internal rectus recession and external rectus shortening.