The red reflex is a reflective phenomenon seen when light passes through the pupil and is reflected back off the retina to a viewing aperture, creating a reddish orange glow. You may notice this commonly in pictures with flash.

What does a positive red reflex mean?

A red reflex test can detect cataract and retinoblastoma. Both conditions require urgent referral. Open in a separate window. The red reflex is easier to see in a darkened room.

What does red reflex absent mean?

The single most important piece of clinical information that a paediatric ophthalmologist requires is the presence or absence of a red reflex. An absent red reflex usually suggests sight-threatening pathology (cataract) and may mean life-threatening pathology (retinoblastoma).

Is red reflex normal in adults?

To be considered normal, a red reflex should be seen in both eyes symmetrically and equivalent in color, intensity, and clarity. An absent or black reflex may indicate an obstruction that is preventing light from reflecting back to the examiner.

When should red reflex be tested?

It is essential to test the red reflex after birth, at the age of six weeks and also during routine consultations or when parents are concerned about the child’s vision or the appearance of her or his eyes. The test can alert us to large lesions in the retina.