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I guess this means that the rods and cones in our eyes are capable of processing UV light, but our natural lenses filter it out while implants like this don't? Anyone have a deeper explanation?
Seems to be what he is suggesting.

So perhaps a small percentage of people (myself included) have increased sensitivity in the S cones to light around 400nm (or shorter) ... but normally, the natural lens would filter that out - mine is now gone.

http://www.komar.org/faq/colorado-cataract-surgery-crystalen...

Chromatic aberration. Lens focus is perfect for one color; as you vary from that color the image is necessarily blurry, more so the further you get. Our brain processes images better if we don't add blurry ultraviolet over everything.

This is old news? When cataract surgery was first done, replacement lenses were simple glass with the same effect. Ultraviolet filter was added at some point?