Several differences between cow and human eyes include pupil shape and iris color, according to The Seattle Post-Intelligencer. For example, cow eyes are brown, with rare exceptions, while human eyes come in a variety of colors. However, range of motion and vision capabilities are more significant differences.Know More
Humans have six eye muscles that allow their eyes to travel in six directions: up, down, left, right, clockwise and counterclockwise. On the other hand, cows only have four muscles, and their eyes are limited to up, down, left and right. However, Pawnation states that cows' eyes make up for their limited motion by providing a wide range of vision. Cows can observe nearly everything going on around them at once.
Another difference between cow and human eyes is pupil shape. Humans have round pupils, while cows' pupils are slit-shaped. Due to their pupil shape and their weak eye muscles, cows have trouble focusing quickly on moving objects, according to Pawnation. They also have poor depth perception due to their monocular vision.
Color perception is another difference. It was once thought that cows could not see color, but Pawnation states that studies show cows can distinguish several colors quite easily, especially yellow, orange and red. On the other hand, except in cases of colorblindness, humans can distinguish a wider range of colors due to a difference in eye anatomy.Learn more about Organs
Some causes of broken blood vessels in the eyes are severe coughs, strong sneezes, vomiting, lifting heavy weights and straining according to the Mayo Clinic. In some cases, there is no cause for this problem. The rupture of a blood vessel in the eyes is called a subconjunctival hemorrhage.Full Answer >
Red or bloodshot eyes are the result of blood vessel swelling that can be brought on by a wide variety of factors and conditions. For example, things as innocuous as dry air can cause redness in the whites of the eyes.Full Answer >
Black eyes are caused by bleeding underneath the skin due to blunt impact. The skin underneath the eyes is thinner, so blood pooling in the area is more obvious than in other areas, giving the distinctive shine to a black eye.Full Answer >
According to optometrist Troy Bedinghaus, red spots on the whites of the eyes might be caused by bursting of small blood vessels, inflammation of episclera, sickle cell anemia, inflammation of pinguecula, conjunctival hemangioma or cancerous growths. These red spots are harmless in some cases, but signal a disease in others.Full Answer >