What does a cataract affect in the eye?

A cataract primarily affects the opacity of the lens and/or capsule in the eye. This condition results in the lens becoming cloudy or opaque, which can significantly impair vision. The lens is responsible for focusing light onto the retina, and when it becomes cloudy, light cannot pass through clearly, leading to blurriness or dimness of vision.

The other options do not relate directly to the effect of cataracts. The cornea, while crucial for overall eye clarity, is not the structure that is affected by cataracts. Intravitreal pressure pertains to the fluid pressure inside the eye, which is not influenced by cataract development. Retinal detachment involves the separation of the retina from the underlying tissue but is a different condition from cataracts. Understanding this distinction helps clarify the specific impact of cataracts on eye health.