Dog vision

      For a long time, many people believe that dogs can not distinguish colors. Recently, researchers have found that dogs can distinguish the different Levels of gray, but also able to distinguish between certain colors, especially blue and purple.

Canine visual differences in human response to light, the dogs eyes and different from the human eye. The human eye caused by a variety of colors on the three primary colors (blue, yellow, red) responsive. University of Florida College of Veterinary Medicine Associate Professor of Ophthalmology, Dr. Dennis Brooks, said: 『dog's vision and human vision are different; dogs like human beings can not distinguish between the various colors, but the dog can actually see some color. Dogs to distinguish different shades of blue, indigo and purple, but for the spectrum of the red, green and high-chroma colors are not a special sensibility. Dr. Brooks research shows that the dog is dark red, and green for the right dog is white, so the green lawn in the dog appears to be a white grass.

Dog retina dog eyes light the receiving device - the retina - contains large amounts of columnar cells, columnar cells contribute to the dark vision and surveillance, as the moving object. Another cell in the retina as the vertebra-like cells, the main function of vertebral dendritic cells is to distinguish colors, and identification of the office fine. Dog an extra layer of the retina choroid layer (tapetum lucidum), there is a strong reflective nature, but also to increase the dog's night vision. Because the light entering the eye retina will impact the receiving device on the light (photoreceptor), but may also penetrate the retina fault; but in terms of pairs of dogs, due to choroid layer, it is not lost even if the light rays hit the receiving device , will reflect back to the retina, causing the so-called second sight. Choroid layer also contributed to the dogs when the dogs eyes showed bright yellow, green, red eyes because frightened people. A few dogs lack this layer of the eye structure, but cause remains unknown.

The relationship between vision and short-nose dog breeds (such as bull dogs) can see the long depth of field, while the long-nosed dogs (such as the Shepherd) is a wide field of vision. In addition, dogs skull shape and the length of the nose can also affect their vision. Is generally believed that most of the dogs are a little short-sighted phenomenon. A small number of hyperopia phenomenon;, but the degree of myopia and hyperopia base.

Veterinarians for dog owners to provide eye care tips eye foreign body was found in dogs, the veterinary treatment as soon as possible to send requests and not on their own cotton swabs or fingers so as to wipe out, so as not to damage the eyes. Another dog was found when the common claw grasp eyes, tears, blinking, red-eye, eye shade, colored discharge, or a third eyelid prominence, and so on, but also for medical treatment as soon as possible. Carry dog travel, they should ban dogs head out the vehicle to avoid the eyes caused by insects, the impact of serious harm. The use of any products containing alcohol (such as the Clean ears agent), should definitely avoid touching the eye. For the dog bath, avoid the bubble into the eye lotion; washing around the eyes, it can cover the eyes, and make the head slightly thrown back, to prevent the lotion into your eyes. The event of lotion into the eye, apply a large number of sterile saline wash, if necessary, and treatment.