Color Blindness 1: Intro 

Dear Sir, Thank you very much. The video is very clear to those who are not doctors. I can now understand better the visual feature of my son, which is a slight difficulty distinguishing some shades of different colors. Thank you for your selfless efforts. Sincerely, Jaime Villarreal

You are the best for these videos. im a deutan studying my deficiency and these are the best sources for visualization and explaination

This is a fantastic video. Found you channels researching the CIE Chromaticity Diagram Then stumbled across this fantastic video - even better!

Btw its not purple, its violet. Purple doesnt exist in the color spectrum. Thats why rainbows dont have purple, they have violet.