Because the different
parts of the eye work together so seamlessly, many of us think of the eye as one single
body part. If asked to label the eye, most would be hard pressed to point
out anything more than the pupil and the iris. The truth is, though, that
the eye is a very interesting organ, with many different parts.
parts of the eye that are visible when we look in the menu are:
- The iris and pupil – The iris is the colored part of the eye, a ring-shaped
tissue, and the pupil is the opening in the middle of the iris. Together,
they control how much light enters the eye; the iris’s muscles cause
the pupil to grow larger to let in more light in the dark or smaller when
the light is bright.
- The sclera – The sclera is the white part of the eye, a leatherlike
tissue that surrounds the eye and gives it shape.
- Conjunctiva – The conjunctiva is thin, clear skin that covers the
front of the eye, and helps to keep bacteria and other foreign material
from getting behind it.
- Cornea – The cornea is located just in front of the iris, and is
so clear that you may not even realize it is there. It acts as a lens
and helps focus light as it enters the eye.
What you cannot see may be even more interesting.
- Extraocular Muscles – Each eye has six extraocular muscles to help
move it left and right, up and down, and diagonally.
- Crystalline lens – The lens is a clear, flexible structure located
just behind the iris and the pupil, and is surrounded by a ring of muscular
tissue called the ciliary body. Together, these components work to control
the focus of light passing through the eye.
- Optic Nerve – The optic nerve is comprised of one million nerve fibers
that transmit nerve signals from the eye to the brain. Its front surface,
the optic disk, is visible on the retina.
- Vitreous Cavity – Behind the lens but in front of the retina is the
vitreous cavity, which is filled with a gel-like fluid, called the vitreous
humor. The vitreous humor helps maintain the shape of the eye.
- Retina – The retina converts light signals into nerve signals that
are sent to the optic nerve and carried to the brain for processing. The
retina contains rods and cones to help you see colors in high and low
light, and the macula, which provides sharp central vision.
The eye is a fascinating organ, seemingly simple to look at, but in truth
very complex. The way the parts of the eye work together to enable sight
is miraculous in its efficiency. Vision is something we often take for
granted, but it is good to know all that is involved in its function.
Key-Whitman Eye Center is a leader in LASIK and Cataract surgery in Dallas, Fort Worth, and North
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