4.2

• camera eyes - eyes that have a cornea, lens and retina - round in shape

  • most vertebrates have camera eyes
• birds - birds have more cones that are sensetive to more wavelengths of light, they can distinguish more colours and shades than humans
• fish - fish have lenses that stick out of their eye, this allows them to see in all directions. they have a perfectly round lens
• nocturnal animal - active at night
• nocturnal eyes -

  • very large pupils
  • tapetum lucidium which acts as a mirror that reflects light
  • more rods in retina
• compound eyes - an eye that is made up of many optical units

  • insects and crustaceans
  • made up of small dots of light
  • the more ommatidium the more detailed
  • good at detecting motion
• ommatidium - a single optical unit in a compound eye

  • has a focusing cone with a light sensitive cell
  • convex surface