If you are looking at photos from the holidays and notice your child has a white or yellow glow in one of their eyes, it could be a sign of a serious disease.

So says Phoenix Children’s, which recently provided information for “Knowing the Glow,” including what you should do if you see something that concerns you. “The Glow,” known medically as leukocoria, is an abnormal reflection from the eye’s retina. It shows up as a white, opaque or yellowish spot in the pupil of an eye. Phoenix Children’s reports one in 80 children can reveal the glow in their eye before age 9. This glow can indicate one of more than 20 different eye diseases and conditions. None of the conditions can be diagnosed without the help of an optical device that an optometrist or ophthalmologist uses but parents or family members are the first to notice “The Glow” in 80 percent of cases, according to Phoenix Children’s.

This color in the eye could suggest your child has retinoblastoma, a rare type of eye cancer that typically develops before age 5. Treatments for this cancer are generally highly effective.

Phoenix Children’s recommends that if you see the glow in more than one picture of your child you schedule a comprehensive eye exam, which includes a red reflex test with a pediatric ophthalmologist or an optometrist. Treatment is available at Phoenix’s Children’s.

To learn more or schedule an appointment at Phoenix Children’s, call 602- 933-EYES (3937) or visit phoenixchildrens.org/centers-programs /ophthalmology.