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Resource Article

The Human Eye

The human eye is a vital organ that refracts light to produce a focused picture. The human eye is about 0.9 inches tall and one inch wide and deep. The human eye is the key to see the outside world, read and gain knowledge, and our window for visual expressions. The human eye is protected by three layers of tissue: sclerotic coat, choroid coat, and retina. The sclerotic coat is the outer layer that forms the transparent layer cornea. The choroid coat is the middle layer that forms the iris in the eye. The retina is the innermost layer of the eye and contains rods, cones, and light receptors. 

The human eyes are very delicate and they are well protected by several mechanisms. The eyelashes and eyelids protect the eyes from dirt and bright light. Tears provide lubrication to the eyes and this moisture helps in removing any kind of irritants from entering the eyes. Eye care is very important for the entire family. Annual eye checkup not only helps in correcting vision problems, but also diagnosis some serious health problems.

Anatomy of the eye

Anterior Chamber: The anterior chamber is the section between iris and cornea, which is filled with a watery substance called aqueous chamber.

Aqueous: The aqueous humor is water like fluid that fills the space between lens and cornea, and well protected by the ciliary body.

Artery: Artery or central retinal artery is a blood vessel that branches off from the ophthalmic artery to supply blood to the retina.

Canal of Schlemm: The canal of schlemm allows the aqueous humor to pass from the anterior chamber to the blood vessel. Blockage of this canal can lead to glaucoma, an increased pressure in the eye that destroys the optic nerve.

Choroid: The choroid is the middle layer of the eye that lies between the sclera and the retina. This layer is responsible for supplying blood to the retina.

Ciliary Body: The ciliary body is the place where the aqueous is produced, and this contains ciliary muscles. The change in ciliary body and ciliary muscles help the eyes to adjust vision between far and near objects.

Conjunctiva: The conjunctiva is a thin layer of tissue that protects the inner eyelids and front of the eye. This is the first layer for protecting the eyes from any infection.

Cornea: The cornea covers the front part of the eye and it is nourished by the aqueous humor. The cornea acts like a lens and allows light to pass through the interior of the eye.

Iris: Iris is located at the front part of the eye, just behind cornea. Iris protects the retina and this pigmented part is responsible for eye color.

Lens: The lens is a transparent part that lies between the vitreous humor and the iris. The lens is an adjustable structure that helps to focus far and near objects.

Macula: Macula is the center structure of the retina and responsible for reading vision.

Optic Nerve: Optic Nerve or cranial nerve II is responsible for transmitting electric impulses from the eye to the brain. Each optic nerve is formed by many nerve fibers.

Ora Serrata: The ora serrata is the serrated margin between the ciliary body and the retina.

Posterior Chamber: The posterior chamber is the area that lies behind the iris and it is filled with aqueous humor.

Pupil: The pupil is the aperture through which the light is allowed to pass through and the iris controls the size of the aperture.

Rectus Medialis: The rectus medialis is an orbital muscle that helps in the movement of the eyeball.

Retina: Retina is the innermost layer of the eye. It is responsible for converting the light rays into electrical impulses.

Sclera: Sclera is the white, outer layer of the layer. It is responsible for the shape of the eye and protecting the delicate parts of the eye.

Vein: The retinal vein run through the optic nerve and allows blood to pass from the capillaries to the larger veins that lie outside the eye.

Vitreous: The vitreous cavity is the area between the retina and the lens, and it is filled with gel like fluid like vitreous humor.

Here are a few additional resources on the human eye and its anatomy:

• Description of the Human Eyes
• The Human Eye
• Vision
• Eye Anatomy
• Gross Anatomy of the Eye
• About the Eye

Resource Article

The Human Eye

The human eye is a vital organ that refracts light to produce a focused picture. The human eye is about 0.9 inches tall and one inch wide and deep. The human eye is the key to see the outside world, read and gain knowledge, and our window for visual expressions. The human eye is protected by three layers of tissue: sclerotic coat, choroid coat, and retina. The sclerotic coat is the outer layer that forms the transparent layer cornea. The choroid coat is the middle layer that forms the iris in the eye. The retina is the innermost layer of the eye and contains rods, cones, and light receptors. 

The human eyes are very delicate and they are well protected by several mechanisms. The eyelashes and eyelids protect the eyes from dirt and bright light. Tears provide lubrication to the eyes and this moisture helps in removing any kind of irritants from entering the eyes. Eye care is very important for the entire family. Annual eye checkup not only helps in correcting vision problems, but also diagnosis some serious health problems.

Anatomy of the eye

Anterior Chamber: The anterior chamber is the section between iris and cornea, which is filled with a watery substance called aqueous chamber.

Aqueous: The aqueous humor is water like fluid that fills the space between lens and cornea, and well protected by the ciliary body.

Artery: Artery or central retinal artery is a blood vessel that branches off from the ophthalmic artery to supply blood to the retina.

Canal of Schlemm: The canal of schlemm allows the aqueous humor to pass from the anterior chamber to the blood vessel. Blockage of this canal can lead to glaucoma, an increased pressure in the eye that destroys the optic nerve.

Choroid: The choroid is the middle layer of the eye that lies between the sclera and the retina. This layer is responsible for supplying blood to the retina.

Ciliary Body: The ciliary body is the place where the aqueous is produced, and this contains ciliary muscles. The change in ciliary body and ciliary muscles help the eyes to adjust vision between far and near objects.

Conjunctiva: The conjunctiva is a thin layer of tissue that protects the inner eyelids and front of the eye. This is the first layer for protecting the eyes from any infection.

Cornea: The cornea covers the front part of the eye and it is nourished by the aqueous humor. The cornea acts like a lens and allows light to pass through the interior of the eye.

Iris: Iris is located at the front part of the eye, just behind cornea. Iris protects the retina and this pigmented part is responsible for eye color.

Lens: The lens is a transparent part that lies between the vitreous humor and the iris. The lens is an adjustable structure that helps to focus far and near objects.

Macula: Macula is the center structure of the retina and responsible for reading vision.

Optic Nerve: Optic Nerve or cranial nerve II is responsible for transmitting electric impulses from the eye to the brain. Each optic nerve is formed by many nerve fibers.

Ora Serrata: The ora serrata is the serrated margin between the ciliary body and the retina.

Posterior Chamber: The posterior chamber is the area that lies behind the iris and it is filled with aqueous humor.

Pupil: The pupil is the aperture through which the light is allowed to pass through and the iris controls the size of the aperture.

Rectus Medialis: The rectus medialis is an orbital muscle that helps in the movement of the eyeball.

Retina: Retina is the innermost layer of the eye. It is responsible for converting the light rays into electrical impulses.

Sclera: Sclera is the white, outer layer of the layer. It is responsible for the shape of the eye and protecting the delicate parts of the eye.

Vein: The retinal vein run through the optic nerve and allows blood to pass from the capillaries to the larger veins that lie outside the eye.

Vitreous: The vitreous cavity is the area between the retina and the lens, and it is filled with gel like fluid like vitreous humor.

Here are a few additional resources on the human eye and its anatomy:

• Description of the Human Eyes
• The Human Eye
• Vision
• Eye Anatomy
• Gross Anatomy of the Eye
• About the Eye