"Leukocoria" is the term used to describe a pupil that appears white. Generally, this occurs because there is a white reflection from something inside the eyeball that isn't supposed to be there. Sometimes this is more noticeable when looking at photographs, as one eye may appear to have the normal "red reflex" in the photo, while the other eye appears to have a white reflex. Please, if you feel your child may have this sort of white reflection in one pupil, do not hesitate to have him/her examined by an eye doctor. This could be the first sign of a retinoblastoma (a very serious intraocular tumor) or a congenital cataract, both of which are rare but need to be treated ASAP.