Both of these tests are used to screen for colour vision deficiency or colour-blindness.Both these tests also lie under umbrella of Farnsworth-Munsel Test.So I want to clear that where do differences lie in their principles and application.
I have not worked extensively with this, but here you can have my two cents:
The experimental difference is only the resolution. The difference in the analysis results is much more pronounced. D-15 can be used to determine if the subject has severely disabled color vision. FM-100 gives an estimate of the persons ability to distinguish fine differences between colors (as well as large difference).
We have used the FM-100 to determine color discernibility under different illumination.
Dr. Thorseth is correct. The difference is primarily of resolution. D-15 will identify more severe deficiencies, while FM-100 will identify smaller ones. Obviously D-15 is much easier for subjects to perform, and it takes less time. Some information about them is online at:
http://www.color-blindness.com/farnsworth-munsell-100-hue-color-vision-test/
http://www.color-blindness.com/color-arrangement-test/
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