Evolution of human colour vision lights, which appear to be clear. Other colour perception issues include having trouble distinguishing yellows from reds and violet, lavender and purple from blue. In other cases, objects that reflect both red and blue light may appear to just be blue to these individuals. Deuteranopes, who are missing medium wavelength sensitive cones, are similar to protanopes in that they cannot distinguish between colours in the green-yellow-red part of the electromagnetic spectrum. However, deuteranopes do not suffer from dimming issues. For example, purple colors are not seen as being opposite to other colours in the spectrum but instead appear to be
Legend of the Five Rings five interlocking rings. The only way to completely resolve the issue was to quit using the symbol. For the role-playing game this meant very little, but for the collectible card game it meant that the backing of the cards had to be redesigned, which left players with a mix of cards that essentially resulted in marked decks. In an attempt to appease the players, Wizards released the first set with the different backs – Spirit Wars – bundled with opaque sleeves that would obscure the designs on the backs of the cards, allowing players to use any mix of cards