Lion
Asiatic Lions
Learn more about the asiatic lions' eyes.
Basic Intro
The Asiatic Lion, with a scientific name of Panthera leo persica, is a lion that lives in the Middle East to India. They are also known as the Indian Lion or the Persian Lion. They have a life span of 16 to 18 years and the adult lion weigh 300 to 500 pounds. The Asiatic Lions have highly developed night vision.
Structure of the Eye and Vision
The Asiatic Lion mainly see blue and green. They're able to see better at night. The eye has the cornea, Pupil, lens, Iris, Vitreous gel, Retina, Macula and Fovea and the optic nerve. Also there is the Tapetum Lucidum. The Asiatic lion's eye have more rods than cone cells in the Retina. Also it has white strips under their eye.
Comparison to the Human Eye
The lion eye is just as strong as the human eye during the day; however, the lion eyes are far superior at night. In fact, asiatic lions can see eight times better than humans in the dark! The reasoning behind this lies in the amount of rods and cones in the eye. Like humans, asiatic lions have a larger presence of rods in comparison to cones. This allows the eye to adjust to dim light using the rods, while still providing sharp color during the day with cones. Asiatic lions, however, have a larger presence of cones in comparison to humans. The levels of cones and rods in the lion eye allow them to see in 1/6 of the light humans need to see! Another difference between humans' and lions' eyes is the tapetum. Lions have a tapetum which increases the amount of light entering the eye and reflects it. The tapetum is also what allows the lion eyes to illuminate at night. One major difference between human and lion eyes is the white stripes under the eyes of an asiatic lion. These stripes enhance the amount of light entering the lion eye by reflecting the light back into the eye. These are some main differences between the asiatic lion's eye and the human eye.
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The Anatomy of the eye
The ion eye is mainly composed of 14 parts. Here are the different parts and it's description:
The tapetum: The tapetum is a thin, blueish, greenish layer over the retina
The white stripes under the eye: a rectangular shaped white stripe under the eye
Macula (Fovea): the little dip at the back of the eye
Optic nerve: a bunch of nerves located behind the eye. It connects the brain to the eye
Retina: the thin black innermost layer of the eye
Lens: a concave or convex shaped transparent part in your eye
Cornea: the transparent front part of the eye that is positioned in front of the pupil and the iris
Iris: a circular muscle surrounding the pupil
Pupil: a black hole in the middle of the eye
Sclera: white, opaque, tough covering of the eye
Vitreous humor: a transparent gel-like material
Aqueous humor: clear liquid
Choroid: Middle layer of the eye, located between the retina and the sclera
Ciliary muscles: composed of both longitudinal and circular fibres
Interior: Lion
Below are parts of the interior eye with their functions.
The Function of the Eye
Tapetum lucidum: Reflects light entering the eye and increases the amount of light entering the eye
Rods, cones: helps see color (cones), helps see in dim light (rods)
Vitreous gel: Holds internal structure in place, and gives shape to the eyeball.
Macula (fovea): Helps produce a clear sharp vision. Highest sensitivity to vision.
Optic nerve:to transfer visual information from the retina to the vision centers of the brain via electrical impulses.
Retina: Absorbs light entering the eye.
Lens: Bends light rays so that they form a clear image on the retina.
Cornea: protect the pupil and iris positioned in front of both.
The Function of the Eye
Exterior: Lion
Below are parts of the exterior eye with their functions.
Iris: regulate the amount of light entering the eye.
Pupil: to regulate the amount of light entering the eye with help of the iris.
Sclera: supporting wall of the eyeball.
Cornea: protect the pupil and iris positioned in front of both.
White stripes: reflects faint light into the eye making their night vision better. (maximizes light in the eye)
Second eyelid (nictitating membrane): protects and keeps the eye clean
Impairments
of Felines
Felines have three main eye impairments. These impairments are cataracts, glaucoma, and progressive retinal atrophy. Cataracts occur when the lens gradually clouds up and prevents light  from entering the eye. Glaucoma is excessive fluid pressure within the eyeball that can cause it to harden and limit vision. Progressive retinal atrophy causes the retinal tissue to degenerate and lose its ability to function properly. It is possible to fix these impairments using surgery during the early stages.
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This Is Your About Page SubtitleBelow are the internal parts of a human eye
Human eye internal
Ciliary Muscles: A ring of smooth muscle fibers. Its function is that it is responsible for changing the shape of the lens in the eye.
Aqueous Humor: A clear, transparent liquid which nourishes the cornea
Lens: A clear, nearly transparent, colorless and hard disk; used to focus light
Vitreous Humor: Clear, jelly-like fluid; holds internal structures in place; give shape to the eye
Retina: The thin, innermost layer of the eye; sensitive to light; absorbs light entering the eye
Choroid: The thin, innermost layer of the eye; sensitive to light; absorbs light entering the eye
Macula: Concentration of cone cells. Helps produce a clear sharp vision.
Fovea: The dip in the macula which holds only cone cells; the highest sensitivity to light
Optic Disk: Raised disk on the retina; lacks visual receptors
Optic Nerve: A structure which transmits impulses from the retina to the brain in the back of the eye
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Below are the external parts of a human eye
Human eye external
Sclera: The white, opaque, tough covering of the eye; supporting wall of the eyeball
Cornea: Protects the iris and the pupil; positioned in front of both; nourished by the aqueous humor
Iris: Circular muscles surrounding the pupil; different colors for different people due to the lack or concentration of melanin
Pupil: An opening in the middle of the eye; sensitive to light; regulates the amount of light entering the eye with the help of the iris
Lacrimal glands: Tears are produced by the lacrimal glands; paired almond-shaped
Eyelashes: Hairs on the lid of the eye, protects eye from dirt and dirt
Eyebrows: Hairs on top of the eye, protects eye from sweat and dirt
Impairments for Humans
There are many common impairments associated with the human eye. A cataract is a cloudy or opaque discoloration in the lens of the eye. It can spread all over the lens until it is covered in thin film. This can lead to blindness if not treated properly. Another impairment could be astigmatism. Astigmatism is an eye disorder in that can occur in the lens or the cornea. It is caused by the lack of symmetry in the curvature of the lens or cornea. This causes the uneven curvatures to diffuse light rays and interfere with a sharp focus at the retina. Surgery can help in both cases of astigmatism and cataracts to correct the impairment. Glasses or contact lenses can also be used to both impairments; however, this option can only be used in the early stages of a cataract.
Visual Pathway
The red part of the bar is the left visual field and the blue part is the right visual field. Your left field of vision will hit the right side of the retina and the right will hit the left side of the retina. The part where the blue hits is the temporal part of the retina and the part where the red hits is the nasal part of the retina. The information goes through the optic nerve and then a crossover occurs in the optic chiasm. After the optic chiasm, information of the right visual field is on the left side of the brain and the information of the left visual field is on the right side. This continues all the way to the visual cortex.
