Question

The tapetum lucidum is present in which part of the eye?

• A. Choroid
• B. Sclera
• C. Cornea
• D. Iris

Hint:

The tapetum lucidum is always located in the choroid layer of the vascular tunic, directly underlying the non-pigmented retinal pigment epithelium in that region.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The eye is composed of three primary tunics: the fibrous tunic (outer), the vascular tunic/uvea (middle), and the nervous tunic/retina (inner).
The tapetum lucidum is a biological reflector system that enhances low-light vision in many animals.

Step 2: Detailed Explanation:
The tapetum lucidum is a specialized, reflective layer located in the vascular tunic (uvea) of the eye.
Specifically, it is situated within the dorsal part of the choroid, directly behind the retina.
It reflects visible light back through the retina, increasing the light available to the photoreceptors and giving rise to the characteristic "eye shine" seen in cats, dogs, and ruminants at night.
The other parts listed have different roles:
- Sclera and cornea are parts of the fibrous outer tunic.
- Iris is the colored, anterior part of the vascular tunic.
Therefore, the tapetum lucidum is located in the choroid.

Step 3: Final Answer
The correct option is (A).