Which structure is behind the pupil, focuses light, and becomes cloudy if a cataract forms?

Which structure is behind the pupil, focuses light, and becomes cloudy if a cataract forms?

• A. Cornea
• B. Iris
• C. Lens
• D. Retina

Answer: (C)

The lens sits just behind the pupil and is the structure that focuses light onto the retina by changing its shape as needed (accommodation). When a cataract forms, the lens becomes cloudy, scattering and blocking light, which blurs vision. The cornea handles most of the initial refraction at the eye’s front, the iris controls how much light enters by changing pupil size, and the retina is where light is detected and signals are sent to the brain. The key idea is that the lens, located behind the pupil, is responsible for focusing light and is the structure that becomes cloudy in a cataract.

The lens sits just behind the pupil and is the structure that focuses light onto the retina by changing its shape as needed (accommodation). When a cataract forms, the lens becomes cloudy, scattering and blocking light, which blurs vision. The cornea handles most of the initial refraction at the eye’s front, the iris controls how much light enters by changing pupil size, and the retina is where light is detected and signals are sent to the brain. The key idea is that the lens, located behind the pupil, is responsible for focusing light and is the structure that becomes cloudy in a cataract.