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Light enters the eye through structures in the following order

cornea>pupil>lens>retina

The retina is made up of several layers of cells, in the following order: ganglion cells, amacrine cells, bipolar cells , horizontal cells, photoreceptors.

Thus light passes through 4 cell layers in the retina before hitting the photoreceptors (rod and cones), which initiates the process of vision. Notice that all the structures light encounters before hitting the absorbing pigments in the photoreceptors are completely transparent to visible light, but not necessarilly to infr-red or ultra-violet light. Cornea, Iris, Retina a. cornea, iris, retina

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