The red-eye effect in photographs is caused by flash illuminating which tissue?

The red-eye effect in photographs is caused by flash illuminating which tissue?

• A. Retina.
• B. Iris.
• C. Cornea.
• D. Lens.

Answer: (A)

Red-eye happens when the camera flash light enters the pupil and reflects off the back of the eye, specifically the retina and the underlying vascular tissue. The retina contains lots of red blood vessels, so the reflected light has a red color that travels back through the pupil to the camera. The iris is front and pigmented, so it doesn’t produce that red reflection. The cornea and lens are transparent and typically contribute highlights or glare, not the characteristic red color. So the tissue responsible for the red-eye effect is the retina.

Red-eye happens when the camera flash light enters the pupil and reflects off the back of the eye, specifically the retina and the underlying vascular tissue. The retina contains lots of red blood vessels, so the reflected light has a red color that travels back through the pupil to the camera. The iris is front and pigmented, so it doesn’t produce that red reflection. The cornea and lens are transparent and typically contribute highlights or glare, not the characteristic red color. So the tissue responsible for the red-eye effect is the retina.