Which term describes the ability of the lens to bend light rays so they focus on the retina?

Which term describes the ability of the lens to bend light rays so they focus on the retina?

• A. Refraction
• B. Visual acuity
• C. Ptosis
• D. Conjunctivitis

Answer: (A)

Refraction is the bending of light as it passes between media with different optical densities, which allows images to be focused on the retina. In the eye, light first passes through the cornea and then through the lens; the cornea provides most of the bending, while the lens changes shape to fine-tune focus for objects at various distances. When this bending correctly brings light to a focal point on the retina, vision is clear. Visual acuity refers to how sharply one sees, but it’s the refraction process that actually governs how the light is bent to reach the retina. Ptosis is drooping of the eyelid, and conjunctivitis is inflammation of the conjunctiva, neither of which describe how light is bent to focus on the retina.

Refraction is the bending of light as it passes between media with different optical densities, which allows images to be focused on the retina. In the eye, light first passes through the cornea and then through the lens; the cornea provides most of the bending, while the lens changes shape to fine-tune focus for objects at various distances. When this bending correctly brings light to a focal point on the retina, vision is clear. Visual acuity refers to how sharply one sees, but it’s the refraction process that actually governs how the light is bent to reach the retina. Ptosis is drooping of the eyelid, and conjunctivitis is inflammation of the conjunctiva, neither of which describe how light is bent to focus on the retina.