Dear Friend,
It is possible that small size of one eye of your child can be due to lid
muscle weakness. That she might have a
ptosis in her left eye. only risk with ptosis is that she might have vision problems if her pupils are not visible on a general observation. If her left eye pupil area is visible clearly and through out the day she will not have any vision problem. In case you find that the pupils are covered by the droopy lid its better to consult an ophthalmologist. Ptosis can be corrected by surgery and decision of when to operate lies with the managing consultant (youger age if vision is getting affected or later if vision is clear). Consult an ophthalmologist to confirm the diagnosis. Take care