• Question: how many cells are in ur eye????? :)

    Asked by lewis12345 to Judith on 11 Jun 2012.
    • Photo: Judith Sleeman

      Judith Sleeman answered on 11 Jun 2012:

      In the retina, there are about 6 million light-sensitive cone cells and another 100 million or so light-sensitive rods. But then there’s the optic nerve, the cornea, the lens…many millions. Lens cells are actually really interesting: so that the light can get through without being scattered, lens cells lose all of the structures that are inside ‘normal’ cells: even the nucleus. But they’re still alive. They don’t renew either, so we still have cells buried somewhere in the lenses of our eyes that were there before we were born.

Comments

  • Photo: Chris

    Chris commented on :

    About the same as in yours. Do you ever stare at a wall and see little circles in your eyes? If you try to look at them they move away? These are what we who use microscopes call “floaters”. They are red blood cells that have enterred the vitreous humor by damage to the capillaries in the eye. You’ll probably notice that you have them for a long time too as the inside of the eye is not rapidly cleaned in order to protect the light sensitive cells.