Human Eye Facts

Eye Parts - Knowledge Booster

Eyes are the organs of vision that detect light and convert it into electro-chemical impulses in neurons. The simplest photoreceptor cells in conscious vision connect light to movement. See the fact file below for more information on Eyes or alternatively download our comprehensive worksheet pack to utilise within the classroom or home environment.

  • The eye is the organ that has the ability to detect light.
  • Your eye is the second most complex organ of your body, after your brain.
  • The human eye is able to distinguish between different shapes and colors.
  • Your eyes are actively working from the moment you open them in the morning up until you close them at night, relaying hundreds of thousands of messages to your brain throughout the day.


  • The human eye also has better depth perception than many other animals.
  • When the eye looks at an object, light rays come through the transparent cornea, enter the pupil and are focused on the retina by the lens. The light rays are bent when they enter the eye and the lens’ job is to make sure the rays come to a sharp focus on the retina.
  • Light-sensitive nerve cells called rods (for brightness) and cones (for color) react to the light and send messages to the brain that indicate brightness, color, and shape. The image that lands on the retina when it first enters the eye is upside-down. The light rays on the retina are converted to electrical impulses which are then transmitted through the optic nerve, to the brain, where the image is decoded and turned right side up.
  • Almost all animals have eyes, or descend from animals that did.
  • An ophthalmologist is a doctor that deals with the diseases and surgery of the visual pathways, including the eye and the brain.
  • An optometrist is a health care professional who is concerned with the health of eyes, gives eye examinations and prescribes glasses when necessary.
  • The human eye has a 200 degree viewing angle and can see 10 million colors.


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