Where does eye cataract begin?

Eye lense: A cataract is a loss of transparency of the natural lens of the eye. Most begin due to aging but some are present at birth, some due to acquired disease, some due to drugs and chemotherapy and some due to trauma. But all are in the lense of the eye.

In the lens: The proteins of the lens begin to change and this causes opacification of the lens, "clouding of the lens".

How Cataract forms: The lens: usually clear, behind iris & like "pillow in a pillowcase." Lens can get cloudy/white=Cataract & can affect VA. If significant or causing narrow angles, surgery may be indicated. Cataract is # 1 cause of preventable blindness in world. Cataract surgery is the most common surgery performed in world & US. Complication risk very low; best time in history to have CS: eyedoc2020.blogspot.com

In the lens: there is something in the eye called the lens, and like the lens of a pair of eyeglasses, when we are born it is supposed to be crystal clear. Over time it becomes cloudy and that's when you call it a cataract. There are different stages of cataracts that are mild to moderate to severe. When cataracts are visually significant and inhibit regular activities, one would suggest taking it out.