Answer:
d. Lens
Step-by-step explanation:
Cataracts directly affect the lens of the eye. A cataract is a clouding or opacity that develops in the lens, which is a clear, transparent structure located behind the iris. As the cataract progresses, it can cause vision impairment and blurred vision by interfering with the passage of light through the lens. Cataract surgery involves removing the cloudy lens and replacing it with an artificial intraocular lens to restore clear vision.