A diagram of the visual pathway is shown here. Light from the left visual field reaches the left nasal retina and the right temporal retina. On the other hand light from the right visual field reaches the right nasal and the left temporal retina.
The optic fibers from the nasal parts of the retina cross, whereas the fibers from the temporal hemispheres don't. This configuration leads to the projection of the left visual field to the right occipital cortex and vice versa.
My question is, why can't light from the left visual field reach the temporal left retina and vice versa? I have illustrated this in the picture below with blue arrows.
Obviously, if it would, it would interfere with the normal pattern of projection. Now my question is what prevents light from the left field of view reach the left temporal retina? Or is there some overlap between the visual fields?