Honestly I don't know. I'm sure you know it's more of a male disorder then a female disorder. Strange enough what seems to go well for me, doesn't for most. The color values has to be my biggest and worst issue. I can tell the difference in a few colors, the main colors that are not a combo. They have to be exact, not light or dark, no whites or grays added or no combo of colors, those are the ones that I am usually correct in saying what they are. Add another shade, lighten or darken it and it's suddenly not what I think it is. I don't know what an Ott light is, can you fill me in?