Think of the eye as a camera, the central part of the eye. The lens is usually clear and over time, with age or trauma, the lens gets opacified, so there is opacity in the lens. We call that the cataract.
The types can be divided into the anatomical layout of the opacity.
We call the front the anterior cataract, we call the back the posterior cataract, we call the middle the nuclear cataract. It is quite position based, yes.
We can divide it based on the severity, so we grade it from less severe to more severe cases.
