<prompt> Which of the following is true about colour visionIndependent of wavelength of lightDepends on intensity discriminationInvolves opponent colour cellsMinimum at fixation point  <response>: Opponent theory for colour vision is proposed by Hering This theory states that the three primary colours red, blue and green oppose one another so that the opponent processing cells cant detect the presence of both colours at the same time Neurotransmitter stored in rods and cones is glutamate Ref: Ganong 25th edpage 191 