### body part | organ | eye:

Blue eye
* are actually due to the lack of brown pigment
  - disqualifications
  - rare in nonhuman primates
* are the most sensitive to light and dark brown is the least
  - light, dark brown the least sensitive
  - result from lack of pigment in the iris
* can also signal neurological defects.
* is caused by the production of blue-green fungal spores on the germ in storage
  - blue-green fungal spores on the germ tissue

Bright eye
* appear larger than life.
* are good bands.
* do diminish and go dark.

Brown eye
* are dominant to blue eyes.
* is dominant over blue eyes.

Caecilian eye
* are small and dark.
+ Amphibian, Anatomy, Senses and skeletal system: Amphibians
  * Amphibians' eyes have lids, glands and ducts. Caecilian eyes are small and dark. Most of them are blind. Most amphibians have a good sense of smell, even underwater.

Cat eye
* are the road reflectors which help drivers see the road at night or in heavy rainstorms.
* contain a reflective layer called the tapetum.

Complex eye
* More complex eyes give the full sense of vision, including color, motion, and texture.
* can distinguish shapes and colours.
+ Eye, Evolution of the eye:
  * More complex eyes give the full sense of vision, including color, motion, and texture. These eyes have a round shape that makes light rays focus on the back part of the eye, called the 'retina'.

### body part | organ | eye:

Compound eye
* Most compound eyes detect movement.
* Most compound eyes have cones
  - crystalline cones
  - lenses
* Some compound eyes have fields.
* are common in arthropods, and are also present in annelids and some bivalved molluscs.
* are different from human eyes which have a single lens for each eye
  - simple eyes
  - found in insects and other arthropods
  - frequently present
  - like thousands of little eyes working together to form one image
  - mainly good for seeing movement
  - normally large
  - usually present
  - very sensitive to movement and can probably see in color
* can see up close.
* have a much lower acuity than mammalian eyes
* have many lenses for each eye
  - such chambers with their lenses on a convex surface
  - thousands of tiny lenses that see in all directions at once
* is an eye
* occur in one family, and simple eyes or none at all in many.
* vary in shape and protuberance.
+ Compound eye, Types of compound eye: Physiology :: Vision
+ Eye, Types of eye, Compound eyes
  * Compound eyes are different from simple eyes. Instead of having one organ that can sense light, they put together many such organs. Some compound eyes have thousands of them. The resulting image is put together in the brain, based on the signals of the many eye units. Each such unit is called 'ommatidium', several are called 'ommatidia'. The ommatidia are located on a convex surface, each of them points in a slighly different direction
  * Simple eyes' are made of only one concave chamber, perhaps with a lens. Compound eyes have many such chambers with their lenses on a convex surface

### body part | organ | eye:

Cuttlefish eye
* are among the most developed in the animal kingdom.
+ Cuttlefish, Anatomy, Eyes: Edible molluscs :: Cephalopods
  * Cuttlefish eyes are among the most developed in the animal kingdom. The way cephalopod eyes develop is fundamentally different from that of vertebrates like humans, but the way they work is rather similar. The similarity between cephalopod and vertebrate eyes is an examples of convergent evolution. Although they cannot see color, they can perceive the polarization of light, which improves their ability to see contrast. The lenses, instead of being reshaped as they are in humans, are instead pulled around by reshaping the entire eye in order to change focus.

Dark eye
* are preferred and seen more often in the black spotted dogs.
* do enhance expression, but true black eyes are undesirable.