If I’ve said it once, I’ve probably told y’all twice… I…

  If I’ve said it once, I’ve probably told y’all twice… I hate things touching the surface of my eyeball.  This includes that really annoying puff of air that they use to diagnose glaucoma.  This condition can result from a clogged one of these (what letter) which leads to increased pressure in the anterior chamber of the eye.                              

  Nutrients are delivered and waste products are carried awa…

  Nutrients are delivered and waste products are carried away from the cells of the posterior segment of the eye by blood vessels. However, the cells in the cornea and lens (in the anterior segment) are avascular (=no vasculature or blood vessels).  Which is the best explanation for how these cells are maintained?