Tx, It certainly is possible. However, it would take a good deal of practice for the wearer to get any benefit.

Firstly, a person with one of the commoner forms of colour blindness can discriminate say for example, "ordinary" red and green with the help of coloured transparent spots on the lenses of otherwise clear glasses.

Such forms of colour blindness seldom are truly "blind" to colour, but often shift their sensitivity to finer discrimination of shades within wavelengths that we lump together as say, yellow or orange. Given such parti-coloured glasses, they should be able to see more colours than people with "normal" colour perception.

Similarly, there is no reason to doubt that wearing carefully designed glasses we should be able to discriminate more "colours" than normal by suitably combining coloured patches on clear lenses. All such discrimination of course would have to be within colour ranges that are visible to our eyes; it would take something more than a filter to make say infrared or ultraviolet visible to us!

And as I said, it would take a lot of practice to get any benefit.

Like short-wavelength violet that is close to ultraviolet and a violet made op of blue and red?

This could be done easily, any red filter will do it.

(A filter transparent for "true" violet as well)

Georg

Take a look at this:

http://www.visualexpert.com/FAQ/Part2/cfaqPart2.html

This whole paper is about our perception of colors, Part 1 is worth a read because it defines terms used in the rest of the paper. An important thing that you will get from this is the magnitude of just noticable differences that the human eye/brain can detect. I have seen some outragious claims for the number of colors that we can percieve (10 million is the upper limit) but the limit of 1 million is probably about right.

Thinking about how the eye actually works, the limits of perception are going to be associated with the dynamic range of each group of detectors, the rods and the cones. I cannot imagine how we might construct a pair of glasses to extend this range without using adaptive, non-linear, active components.