It is not known how many levels of vision there are: There could be billions. Every human being and animal for that matter sees the world differentially. It was believed that all people are the same. We are not. Shades of color can be divided into finer and finer degrees. At one end are the color blind. At the other are probably the most skilled painters. As we age, like taste our vision of the world fades. It is so gradual : we do not notice that the number of colors we see has diminished. Special glasses have been made to change shades of color into fine levels of black. gray and white. This works well in that color blind people have got through the "Ishihara" detection test for this malady. It may be possible to improve perception of gray spectrum shades. Perhaps even detection of colors can be increased. This is for the future though. For now the new spectacles have had a great impact. Adult men have been brought to tears when the glasses are first put on...
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