Why don’t our eyeballs fill up with water when we swim ?

  1. Pupil is present on the front surface of eye.
  2. Pupil is covered in front with a strong transparent film called cornea.
  3. At the back, there is a strong fibrous transparent object called lens.
  4. Space between cornea and lens is filled with gel like fluid called AQUEOUS HUMOR.
  5. All these layers form a tight seal and protect the eye ball from micro organisms, dust, infection and damage.
  6. Inner cavity of eye is filled with another gel like fluid called VITREOUS HUMOR.
  7. This fluid helps in maintaining pressure that keeps eyeball in shape.
  • When we go out swimming, water does not enter our eyes because it is already filled with gel like fluid. Water might irritate our eyes but it does not go inside.