article_snippet: The problem exists in the eye, with the photopigments.
article_snippet: The cone cells in the retina are sensitive to different wavelengths of light.
article_snippet: The cone cells in the retina the retina are sensitive to different wavelengths of light.
article_snippet: For example, one of the cones in the eye will absorb too much red light, creating a phenomenon called ‘spectral overlap’.
highlights_snippet: It occurs due to an abnormality in the cone cells in the eye's retina, which detect different wavelengths of light .
  