In this video you can see what a typical cataract looks like under the microscope in real life. The central nucleus has turned brunescent (yellowish) such that this patient is suffering from decreased vision that is exacerbated by bright lights.
The lens is constructed with three components and has a configuration similar to a “peanut M&M candy.” There is an outer capsule (the hard candy shell), the middle cortex (the chocolate) and the central nuclues (the nut). Cataracts can form at any level, though typically they form in the central nucleus like you can see in this video.
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nscataract.wmv (2.3meg, Windows video file)