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Anatomy of the eye. The bony cavity or socket that contains and protects the eyeball is called the orbit. The orbit is a structure that is formed by several bones. The orbit also contains muscles, nerves, blood vessels, and the structures that produce and drain tears. Structures that protect the eye, horse.
Horses have lots (think millions!) of photoreceptors (light-sensitive cells) in their retinas. They can see colors, though in a more muted scheme than humans. Humans have 3 cones in their retinas while horses only have two. Horses are also able to see movement well, even in lower light.
The equine eye holds about 26 cc of vitreous and 3 cc of aqueous, says Dwyer. Near the center of the eye is the clear lens, which sits just behind the iris—the colored part that...
In this comprehensive guide, we will delve into the intricacies of equine vision, exploring how horses see, the field of view, depth perception, and color vision. We will compare the differences between horse and human vision, shedding light on the role of the horse’s eye structure and shape in shaping their visual capabilities.
How do horses' eyes see? In terms of distance, colour, visual field and imagery, the structure of horse eyes is very different from that of humans. Colour perception. Horses, unlike some other mammals, can certainly perceive colours. Unlike humans, however, they can only see two of the three discernible wavelengths in the light spectrum.
The equine eye is eight times larger than human eyes placed on the sides of their head. The position of the eyes on the horse’s face accounts for differences in how horses see, dictate visual range, peripheral motion detection and depth perception.
Anatomy. The equine eye includes the eyeball and the surrounding muscles and structures, termed the adnexa. Eyeball. The eyeball of the horse is not perfectly spherical, but rather is flattened anterior to posterior. However, research has found the horse does not have a ramped retina, as was once thought. [2]
Vision involves all components of the eye. The eye is contained within the bony orbit of the head. The bony orbit is a cavity, comprising parts of the lacrimal bone (includes fossa for nasolacrimal duct) and the maxilla (includes caudal foramen of infraorbital canal).
The equine eye is designed to help horses easily spot predators, footing, and food. Learning about the unique capabilities of your horse’s eyes can help you better understand his behavior. Is the horse being mean? Stubborn? Probably not.
The anatomy and diseases of the equine cornea are described in Chapter 5. To examine the cornea of the horse, diffuse and focal direct illumination (or transillumination) with magnification is used first, followed in most cases by biomicroscopy using a slit-lamp.