Eye health
The eyes are complex organs. There are many parts that must work together to produce clear vision. Read on to get a basic overview of eye anatomy and learn about common eye conditions.
The major parts of theeyeare listed below. Problems or malfunctions in any part of the eye cause many common eye conditions.
Cornea
Thecorneais a layer of clear tissue at the front of the eye that helps focus light.
Tear ducts
The openings to the tear ducts are located in the upper and lower eyelids at the inner corner of each eye. Tears are secreted by the lacrimal gland from the outer, upper eyelid to the surface of the eye. Tears keep the cornea lubricated andclear of debris. The tear ducts drain the tears away.
Iris and pupil
The colored part of the eye is theiris. It is a set of muscles that control the pupil, which is the opening in the middle of the eye. The iris controls the amount of light coming in through the pupil.
Lens and retina
Thelensis behind the pupil. It focuses light onto the retina, the light-sensitive cells on the back of the eyeball. Theretinaconverts images into electrical signals that are sent to the optic nerve.
Optic nerve
Theoptic nerveis a thick bundle of nerve fibers attached to the back of the eye. It transmits visual information from the retina to thebrain.
When light isn’t focused properly, it causesblurry vision. Glasses, contacts, or surgery can usually correct refractive errors, which include:
- myopia (nearsightedness), which is when faraway objects look blurry
- hyperopia (farsightedness), which is when close-up objects look blurry
- astigmatism, which can result in blurry vision because the cornea is not perfectly shaped to direct light into the eye
- presbyopia, which is farsightedness that’s caused by the loss of elasticity of the eye’s lens due to aging
Glaucomais increased pressure of the fluid inside the eye. This can cause optic nerve damage. Glaucoma is a common cause ofblindness. Age, race, and family history are
Acataractis a clouding of the lens, causing blurry or color-tinted vision. People with cataracts often report “haloes” surrounding objects they’re looking at, particularly at night. This condition is most common in older adults.
Cataracts can be removed by surgery that replaces the damaged lens with anartificial lens.
Age-relatedmacular degeneration(AMD) is gradual damage to the cells of the macula. This condition is most common in people over 60 years of age.
AMD导致视力模糊,尤其是在中心of the field of view. According to the Centers for Disease Control and Prevention, AMD is the most prevalent cause of blindness and vision loss in people over age 65 in the United States.
Amblyopia is commonly referred to as a “lazy eye.” It occurs when vision has not properly developed in the eyes, and the brain begins to favor the eye with better vision.
This happens if one of the eyes is blocked from producing clear images during the critical years from ages birth to 6. One eye may be inhibited by problems such as alid droop, tumor, or misaligned eyes (strabismus) that are not corrected when a child is young.
It is crucial to have an eye doctor evaluate a young child whose eyes do not align or who has vision problems to ensure that the condition is properly diagnosed and treated.
Diabetic retinopathyis damage to the blood vessels of the retina caused by diabetes. It causesblurredor dark spots in the field of vision and can eventually lead to blindness.
The best way to avoid these vision problems is to keep your blood sugars under control, and see your eye doctor every year for adilated eye exam. Proper care can lessen complications.
When the retina separates from the back of the eye, it’s called adetached retina. It causes blurry vision and partial or complete loss of vision and should be treated as a medical emergency.
Dry eyeis a lack of tears. It’s usually due to a problem with the tear formation, tear ducts, or eyelids, or it’s a side effect of certain medications. This condition can causepainand blurry vision.
The eyes are complex, and it’s important to know the different parts and how they function.
Knowing how each part works can help you recognizevision problemsand symptoms of common eye conditions so you can get early treatment and maintain your eye health.