Question

The visible coloured ring of the eye is called:

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

Answer 1

The Correct Option is D

Step 1: Understanding the Concept.
The front of the eye has several layered structures, but only one of them is pigmented and visible as a coloured ring around the black pupil.

Step 2: Key Approach.
Picture the eye from front to back: cornea (clear window), then the coloured ring around the pupil, then the lens, then the retina lining the back wall. Match the "visible coloured ring" description to its position.

Step 3: Detailed Explanation.
Light first passes through the transparent cornea, which has no pigment and cannot be the coloured ring.
Just behind the cornea is a muscular, pigmented diaphragm with a central hole, the pupil, and this ring is what gives the eye its visible colour.
Behind that ring sits the clear lens, and right at the back, out of sight, is the retina where light signals are converted to nerve impulses.
Neither the lens nor the retina can be seen as a coloured ring from outside the eye, so only the muscular pigmented ring fits the description.

Step 4: Final Answer.
The visible coloured ring of the eye is the iris.