Re: Trying to simulate actual properties of a true glass
lens

If you project light through a prism, the wavelengths bend at different angles,
therefore the refraction creates a rainbow.

Coming form a photography background, modern lens manufactures go to great
lengths to avoid the problem by using rare-earth element lenses (I really don't
know what that means) and various multi-coatings. Any rays of light going
through the center of the lens will not be refracted and therefore all the
wavelengths will coincide when projected. But when you get off axis, the
"prism" effect is introduced.

My current pair of glasses for my bad eyesight have a coating to reduce the
effect. Earlier lenses did not. Bight lights when viewed off center would have a
blue halo to one side and a red halo on the other.

Max will not reproduce this effect directly with the IOR settings. You could
probably fake it somehow.

This is not the same as blurring due to Depth of Field.