Which structure maintains the shape of the eye and provides a transparent medium for light?

Which structure maintains the shape of the eye and provides a transparent medium for light?

• A. Vitreous humor
• B. Aqueous humor
• C. Retina
• D. Sclera

Answer: (A)

Light needs a clear medium inside the eye to reach the photoreceptors, and the globe must be held in its shape. The vitreous humor is a clear gel that fills the large interior space, helping maintain the eye’s spherical shape while allowing light to pass through to the retina with minimal scattering. The aqueous humor is a clear fluid in the front chamber, mainly supporting nourishment and pressure rather than shaping the entire globe. The retina is the light-detecting tissue, not a passageway for light. The sclera forms the tough outer wall and is not transparent, so it isn’t a light-transmitting medium.

Light needs a clear medium inside the eye to reach the photoreceptors, and the globe must be held in its shape. The vitreous humor is a clear gel that fills the large interior space, helping maintain the eye’s spherical shape while allowing light to pass through to the retina with minimal scattering. The aqueous humor is a clear fluid in the front chamber, mainly supporting nourishment and pressure rather than shaping the entire globe. The retina is the light-detecting tissue, not a passageway for light. The sclera forms the tough outer wall and is not transparent, so it isn’t a light-transmitting medium.