Question

The sequence of structures through which light rays pass inside eye before reaching upto retina are
(A). Cornea
(B). Lens
(C). Vitreous body
(D). Aqueous humor
Choose the correct answer from the options given below:

• A. (A), (B), (C), (D).
• B. (A), (D), (B), (C).
• C. (B), (A), (D), (C).
• D. (C), (B), (D), (A).

Hint:

An easy way to remember the ocular media in order from superficial to deep is to visualize the anatomy:
Light hits the Cornea first, travels through the Aqueous fluid, passes through the Lens, crosses the gel-like Vitreous, and finally strikes the Retina.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
For vision to occur, light rays must travel through the transparent dioptric (refractive) media of the eye to focus precisely on the photoreceptors of the retina.

Step 2: Detailed Explanation:
The anatomical pathway of a photon of light entering the eye is as follows:
1. Cornea (A): The outermost, transparent fibrous layer that provides the initial and greatest refractive power.
2. Aqueous Humor (D): The clear fluid in the anterior and posterior chambers of the eye, situated directly behind the cornea.
3. Pupil Lens (B): Light passes through the pupil (aperture of the iris) and then strikes the crystalline lens, which dynamically adjusts its shape to focus light (accommodation).
4. Vitreous Body (C): A clear, gelatinous mass filling the large posterior cavity of the eye behind the lens, which maintains the shape of the globe.
5. Retina: The innermost sensory layer where light is converted into neural signals.
Thus, the correct sequence is (A) Cornea $\rightarrow$ (D) Aqueous humor $\rightarrow$ (B) Lens $\rightarrow$ (C) Vitreous body.

Step 3: Final Answer:
This sequence is given in option (B).