Thank you for that photo. I can certainly understand your angst. Please allow me to tell you my experiences after seeing dozens and dozens of children in my office because the parent has noted an abnormal white reflex in the pupil of their child's eye. Whether there is the use of anti-red eye technology or not, I have seen many photographs of children with one white pupil and the other one normal. In nearly every circumstance, the child's eye is perfectly normal on careful examination and the white reflex is caused just by the angle that the flash is coming from relative to the pupil opening. That can be reassuring in some respects, but it's not an absolute guarantee as an exam by a qualified ophthalmologist would be. Nobody would want their child to be the exception. And the exception could mean a cataract, retinal exudative disorders or at worst, retinoblastoma, a universally fatal cancer of the eye if left untreated.
In light of this, after careful examination of your child's photo, it does appear distinctly different from any photos with pupil reflexes caused by any of the afore-mentioned phenomena that I have seen before. It appears unusual because there is a less-intense grayish/white center of the reflex with a more reflective or color-intense white ring around the periphery of the reflex, just inside the pupillary margin. Almost universally, the white reflex that results from one of the afore-mentioned problems is more homogeneous and/or discrete. So in that respect, it makes me worry about one of these problems less.
However, in summary, I do not think that this difference between how your child's pupil reflex looks and those that I have seen before with retinoblastoma, is enough to justify forgetting about this problem. I would, therefore, recommend that you seek out an examination from a qualified ophthalmologist as soon as possible. If you are absolutely unable to find an ophthalmologist, then an optometrist may suffice, and if that is not available, then I would go to his pediatrician.
Does that make sense? What other questions do you have based on what I've just told you?