Search results
Results from the WOW.Com Content Network
The preorbital gland is a paired exocrine gland found in many species of artiodactyls, which is homologous to the lacrimal gland found in humans. These glands are trenchlike slits of dark blue to black, nearly bare skin extending from the medial canthus of each eye.
Animal pupils are sometimes vertical - it would appear that this is the same as a number of small pulis stacked on top of each other. This would give more light and the same sensitivity to movements/prey moving horizontally. If there is a predator that has a horizontal pupil than one could expect it's prey to move vertically.
The entrance pupil is typically about 4 mm in diameter, although it can range from 2 mm (f /8.3) in a brightly lit place to 8 mm (f /2.1) in the dark. The latter value decreases slowly with age; older people's eyes sometimes dilate to not more than 5–6mm in the dark, and may be as small as 1mm in the light.
The horse's wide range of monocular vision has two "blind spots," or areas where the animal cannot see: in front of the face, making a cone that comes to a point at about 90–120 cm (3–4 ft) in front of the horse, and right behind its head, which extends over the back and behind the tail when standing with the head facing straight forward.
The sheep have a dark, horizontal rectangle in the middle of their eyes and this is their pupil. Here we will examine why sheep have rectangular pupils and how this impacts their vision. Sheep ...
With the building out of the way, the Goat Shelter can hold up to 12 Prized Goats, regardless of type (e.g. you could store a Prized Red Goat alongside a Prized Pygmy Goat). Each individual animal ...
The pupil gets wider in the dark and narrower in light. When narrow, the diameter be 1.5 to 4 millimeters. [4] In the dark it will be the same at first, but will approach the maximum distance for a wide pupil 3 to 8 mm. [4] However, in any human age group there is considerable variation in maximal pupil size. For example, at the peak age of 15 ...
Dilation and constriction of the pupil Pupillary response is a physiological response that varies the size of the pupil between 1.5 mm and 8 mm, [ 1 ] via the optic and oculomotor cranial nerve. A constriction response ( miosis ), [ 2 ] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates / opioids or ...