2007 Sensory Physiology

• the structures of the eye adapt light stimuli to ensure that they can be transduced by the photoreceptors found in the retina
• there are 2 primary physiological functions of the accessory structures of the eye:

1. the iris regulates the amount of light that enters the pupil, ensuring that adequate light is present to stimulate, but not saturate, photoreceptors

   • pupil diameter is under the reflex control of the CNS
2. the cornea and lens focus the light onto the retina

Figure 10.19