### body part | organ | eye:

Dry eye
* affect older people more than younger people.
* are a part of the natural aging process
  - especially common in women after menopause
  - more common in women, especially after menopause
  - most common in women after they reach menopause
  - the leading cause of contact lens discomfort
* benefit from artificial tears.
* can be a major impediment to contact lens wear
  - symptom of tight lenses, and can be eliminated by refitting with looser lenses
  - extremely painful and easily become infected
  - uncomfortable, causing itching, burning, or even some loss of vision
  - cause dry spots to form on the ocular surface, causing scratchiness and irritation
  - lead to light sensitivity and corneal ulcers
* cause redness and strain
  - severe pain and later result in severe eyes infection
* common problem as people get older, and in diabetes.
* happen when tear glands don t make enough tears or make poor quality tears.
* is certainly the most common eye condition and the incidence is increasing rapidly
  - just a condition of eyes
* occur when the tear glands produce too few tears.
* reflect deficiency of nutrient or allergy.

Eye donation
* can give precious sight to two individuals.
* gives sight to two corneally blind persons.
* is an option for most cancer patients.

Eye tracking
* involves sophisticated, usually expensive equipment.
* is another important visual function during baseball
  - the ability to follow a moving target with the eyes
* technique used to determine where a person is looking
  - which attempts to determine where a person is looking

Eyes eye
* EYES Eyes are preferably dark or hazel in color.
* Eyes Eyes are large round and set apart
  - large, slightly oval, neither protruding or sunk
  - moderately large, walnut shaped, oval on top and round on bottom
  - the photoreceptive organs par excellence

Fish eye
* are different from our own
  - lidless and lenses are round and firm
* become progressively more cloudy the longer the fish is out of the water.
* have graded-index lenses.

Frog eye
* are large and round, sitting on top of the head.
* have eyelids.
* tend to bulge.

Green eye
* Green Eyes Make green eyes shine with warm browns.
* are basically the result of any remaining brown pigment
  - the result of blue pigmentation being admixed with yellowed phlegm deposits
* have just enough brown pigment mixed in with the blue to give the appearance of green.
* result from yellowish flecks of fatty pigment against a dark background.

Insect eye
* can change considerably between the larval and the adult stage.
* come in two types, simple and compound.

Large eye
* are prominent in silver eels
  - ringed with white fur
* can gather more light than small eyes.
* gather light in dark depths.
* help it to see obstructions.
* mean a large, sharp image.
* positioned at front are most appropriate for a nocturnal bird.

Lateral eye
* are like simple eyes of insects
  - relatively shallow while apical eyes are moderately deep
  - shallow and apical eyes are moderately deep
* make it possible to take in more of the visual world at one time.

Light eye
* are especially unattractive in dark or black dogs
  - more sensitive to macular degeneration and to light
* is only advantageous in the environment they have adapted to.

Owl eye
* are so large that there is little room in their skulls for eye muscles
  - very large
* face forward so that they can focus on their fast-moving prey and judge distances.
* function in bright sunlight, too.