Eye Anatomy

How The Eye Works


 The human eye functions like a camera. It consists of a series of structures that act as lenses to focus light on the back of the eye. 

  1. The cornea, the clear surface on the front of the eye, provides the primary source of focus as light enters the eye. 
  2. The iris controls the amount of light reaching the back of the eye by changing aperture or pupil. The pupil, is a lack of tissue,  alters its size depending on lighting and distance of stimuli. 
  3. The eye's crystalline lens is located directly behind the pupil and further focuses light transmitted through the cornea. Through a process called accommodation, this lens helps the eye automatically focus on near and approaching objects, like an autofocus camera lens.
  4. Light moves through these structures and eventually reaches the retina, the structure that interprets light information into optical images and electric signals. 
  5. The optic nerve then transmits these signals to the visual cortex — the part of the brain that controls our sense of sight.

For more details about specific structures of the eye and how they function, visit these pages:

The information contained on this page is for educational purposes only and is not intended to be medical advice. If you have concerns, please contact us to schedule an appointment.