But its importance can not be overstated.
It is very complex.
Vision is considered the most used of the 5 senses.
- The orbit is essentially the eye socket that is formed by the combination of the cheekbone, nose, forehead and temple.
- Fat lines the inside of the orbit to hold the eye.
- Lacrimal glands located near the upper and lower eye lids help produce tears to lubricate the eye.
- When foreign material enters the eye, lacrimal glands help wash away the eye
- Tears drain through the Nasolacrimal duct in the inner corner of the eye help drain away tears and other items.
Eyelids and Eyelashes
- These functional skin and hairs help protect the eye.
- When you blink, tears are spread through out the eye.
- Act as a filtering mechanism for foreign objects, dust, and debris
- This is the clear layer of skin that covers the eye.
- It is very thin.
- This keeps foreign material and dust from getting imbedded into the eye.
- This is the white aspect of the eye.
- This is a tissue of the eye and is thick and rough.
- This tissue is what gives the eye its shape.
- Muscles that help with movement attach to this layer.
- This is is a smaller, clear layer that sits at the front and center of the eye.
- It covers the Iris, which is the colored part of the eye.
- When light comes at the eye, it’s the Cornea that helps focus it.
- Contact lenses cover the Cornea.
- This is a space behind the Cornea, but in front of the Iris.
- This space is filled with fluid called aqueous humor.
- This fluid nourishes the Cornea and Iris.
- This is the colored portion of the eye.
- It controls the light amount that enters the eye.
- It is a ring shaped tissue and muscles fibers that surround the pupil
- When the pupil contracts or constricts, its the muscles of the Iris that do this.
- This is at the central opening of the Iris
- Contracts and Constricts depending on light brightness or darkness allowing the proper amount of light to enter.
- Works in conjunction with the Iris.
- A clear and flexible structure behind the Iris and Pupil.
- Muscular tissue called ciliary body surrounds the Lens.
- The muscle and the Lens help control the fine focusing aspect.
- This is a space behind the Lens and it sits in front of the Retina.
- Is filled with a gel-like fluid called vitreous humor.
- This also helps maintain the shape of the eye.
- This layer helps create an image.
- Specialized cell change light into nerve signals.
- The Optic Nerve than takes these signals to the brain.
- The brain processes the image.
- Retina has two main types of cells
- 1.) Rods and 2.) Cones
. Rods – sensitive to light – allow you to see in low light situations.
. Cones – sensitive to color – need light to process color.
- Central aspect of Retina
- This gives you sharp central vision.
- Layer of tissue that separates Sclera from Retina
- Largely made up of blood vessels that nourish the Retina.
- Over 1 million nerve fibers that transmit signal from eyes to the brain.
- Front of this nerve, near Retina is called the Optic disk.
Learn about Medical Conditions affecting the Eye