Physiology of the eye

Lens

The lens serves to assist the cornea in the refraction of light. It is shaped in a way that helps to reduce aberrations.

The shape of the lens is flexible and gets "flatter" when viewing distant objects, and "thicker" when viewing nearby objects.

Lens flexibility is reduced with age, resulting in presbyopia.

Sources:

  1. Mark D. Fairchild (2013). Color Appearance Models. 3rd edition. John Wiley & Sons, Ltd. Pages 3
  2. Lens. American Academy of Opthalmology. https://www.aao.org/eye-health/anatomy/lens-9
  3. How eyes work. . https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/how-eyes-work