Which symptom is NOT commonly associated with retinoblastoma?

The presence of calcific deposits in the iris is not a commonly associated symptom of retinoblastoma. Retinoblastoma is a malignant tumor that originates from the retina, predominantly affecting children. The hallmark symptoms include a white reflex (leukocoria), which is the reflection of light showing as a white pupil in photographs, strabismus (misalignment of the eyes), and other visual impairments.

The white reflex is one of the most significant indicators of retinoblastoma and often leads to further evaluation by an ophthalmologist. Strabismus may also be observed in children with the tumor, as the visual axis can be disrupted by the presence of a mass within the eye.

The painful eye with glaucoma can occur in cases of advanced retinoblastoma due to increased intraocular pressure, but it is not a primary symptom nor as commonly observed as the other symptoms mentioned. In contrast, calcific deposits in the iris are more characteristic of other ocular conditions, rather than retinoblastoma. Thus, the correct choice is the one that indicates a symptom not typically associated with this tumor.