write about visions quality of (owl) answer in short
Answers
By comparison, humans have a field of view that covers 180 degrees, with 140 degrees being binocular. A woodcock has an amazing 360 degree field of view, because its eyes are on the side of its head. However, less than 10 degrees of this is binocular. owl's eyes are large in order to improve their efficiency, especially under low light conditions. In fact, the eyes are so well developed, that they are not eye balls as such, but elongated tubes. They are held in place by bony structures in the skull called Sclerotic rings. For this reason, an owl cannot "roll" or move its eyes - that is, it can only look straight ahead!The owl more than makes up for this by being able to turn its head up to 270 degrees left or right from the forward facing position, and almost upside down. There are several adaptations that allow this, outlined in the owl skeletal system article.
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).
Explanation:
VISION QUALITY OF OWL
ALTHROUGH OWLS HAVE BINOCULAR VISION , THEIR LARGE EYES ATE FIXED IN THEIR SOCKETS - AS ARE THOSE OF MOST OTHER BIRDS - SO THEY MUST TURN THEIR FAR VISION , OWLS CAN ROTATE THEIR HEADS AND NECKS AS MUCH AS 270°.
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