Applied Science - Technology (5B)
Post Lab 

  • Comparing the optics of the microscope with that of an eye.
  • Discovering how the eye sees.


  • cones
  • cornea
  • iris
  • light
  • microscope
  • optic nerve
  • optics
  • pupil
  • retina
  • worksheet

Students use a worksheet to compare technology to the human eye.


Technology uses the "physics" of light to aid humans in increasing vision. Many students are curious about exactly how they see. It is understanding the eye and how it works, that allows technology to improve our sight by improving glasses and contact lens.

The human eye sees images upside down and backward. Your brain is sent the image and then turns it the way it really is. The optic nerves take the image from the retina to the brain.

The inner layer of the eye is called the retina and is sensitive to light. The retina has layers of tightly packed cells called rods and cones. Rods are very sensitive to light and help you see at night. Cones need more intense light to work and allow you to see color.

Light passes into the eye through a clear, protective shield called the cornea. Behind the shield is the iris which gives the eye its color. The opening in the center is called the pupil. The lens is behind the pupil and is about the size of a pea. The rest of the eye is called the vitreous humor with is a clear, jelly-like substance. This prevents the eye from collapsing. At the back of the eye is the retina, which is where the image is projected. It contains nerve cells which sends messages to the brain through the optic nerve. The fovea is where the image is focused the sharpest.

  1. Have the students label the retina, fovea, optic nerve, cornea, lens, and iris after you discuss what each of them.
  2. Look at the worksheet and have students trace the path of light through the lens of our eyes. The optic nerve transmits the information to the retina; and the brain inverts the inverted image, so we see the image the way it actually is.
  3. Answers:

  [Back to Applied Science Grid]   [Back to Technology (5)]