Why can some people control cross-eyed at will, while others can't?

Cross-eyed can be natural or artificial. When you look at something, the pupils in your eyes will move closer to the middle. This situation is cross-eyed, because when the pupil moves closer, it looks like a chicken fighting, hence the name.

Incomplete physical development is the cause of cross-eye, especially in infancy, the monocular function of the eye is not fully developed, the coordination ability is poor, or other unstable factors will lead to cross-eye. After cross-eyed, patients often have no three-dimensional sense.

Some cross-eyed eyes are caused by problems in the central nervous system that controls eye movements, which is the cause of esotropia, so this will happen when the control nerves of eye assembly and abduction have problems. Or because there may be a problem with one of the aggregate function and the extension function.

The incidence of cross-eyed is very high, and most of these cases are caused by congenital anomalies. This kind of cross-eyed is gradually evolved because of strabismus. Congenital factors that can lead to cross-eyed include: abnormal development of extraocular muscles, poor separation of ocular muscles and abnormal muscle sheath. And cross-eyed because of optic nerve paralysis.