The symptoms include:

  • Trouble seeing colors and the brightness of colors in the usual way;
  • Inability to tell the difference between shades of the same or similar colors, particularly red and green, or blue and yellow.

Except in the most severe form, color blindness does not affect the sharpness of vision. The inability to see any color at all and to see everything only in shades of gray is called achromatopsia. This rare condition is often associated with amblyopia, nystagmus (involuntary, rapid eye movement), light sensitivity and poor vision.

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