Light pathway to the retina

Steps:

• Light enters the eye through the transparent cornea, the outermost refractive surface.
• It passes through the pupil into the aqueous humor.
• The lens then refracts and focuses the light rays.
• Focused light travels through the vitreous humor to reach the retina.

Why B is correct:

• The cornea and lens are the primary transparent structures that refract light to form an image on the retina, as defined in ocular anatomy.

Why the others are wrong:

• A: Sclera is the opaque outer layer; light does not pass through it to the retina.
• C: Omits the lens, which is essential for focusing light onto the retina.
• D: Sclera blocks light; cornea is required for initial entry.

Final answer: B