Friday, February 05, 2010

OWL EYE

unfortunately owls are not friendly with my cam.difficult to spot and difficult to focus.

3 comments:

  1. As most owls are active at night, their eyes must be very efficient at collecting and processing light. This starts with a large cornea (the transparent outer coating of the eye) and pupil (the opening at the centre of the eye). The pupil's size is controlled by the iris (the coloured membrane suspended between the cornea and lens). When the pupil is larger, more light passes through the lens and onto the large retina (light sensitive tissue on which the image is formed).
    The retina of an owl's eye has an abundance of light-sensitive, rod-shaped cells appropriately called "rod" cells. Although these cells are very sensitive to light and movement, they do not react well to colour. Cells that do react to colour are called "cone" cells (shaped like a cone), and an Owl's eye possesses few of these, so most Owls see in limited colour or in monochrome.
    Since Owls have extraordinary night vision, it is often thought that they are blind in strong light. This is not true, because their pupils have a wide range of adjustment, allowing the right amount of light to strike the retina. Some species of Owls can actually see better than humans in bright light.

    To protect their eyes, Owls are equipped with 3 eyelids. They have a normal upper and lower eyelid, the upper closing when the owl blinks, and the lower closing up when the Owl is asleep. The third eyelid is called a nictitating membrane, and is a thin layer of tissue that closes diagonally across the eye, from the inside to the outside. This cleans and protects the surface of the eye.

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  2. WORLD OWL TRUST
    The Owl Centre
    Muncaster Castle
    Ravenglass
    Cumbria. CA18 1RQ
    United Kingdom

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  3. Owls eyes both face forward, giving them binocular vision somewhat like
    humans, unlike most birds whose eyes are more separated on either side of
    the head. Owls eyes are also very large and somewhat tube-like, giving
    them much greater light gathering ability than most other birds.

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