Problems you'll most probably encounter is that you will later be
able to make out the shape of the IOR-Object due to the
distortion it produces. I don't know though if disc, facing the
camera with a bumpmap which is even to the edges, could
be a solution, perhaps I'll have a look at that.

Easiest would probably be something like using something like
Paint Shop Pro or such to manually distorte...

Tim

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