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In Depth: Eye

Eyes are approximately one inch in diameter. Pads of fat and the surrounding bones of the skull protect them.

The eye has several major components: the cornea, pupil, lens, iris, retina, and sclera. These work together to capture an image and transmit it directly to the brain’s occipital lobe via the optic nerve.

When we look at an object, light reflected from it enters the eye and is refracted, or bent. This creates a focused, upside-down image of the object that the brain will have to interpret and turn in the correct direction.

Inside the eye are photoreceptors, which create nerve impulses when struck by light.

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Nearsightedness (Myopia)

Nearsightedness is a common eye condition in which faraway objects appear blurry.

Farsightedness

Farsightedness means it’s easy to see things that are far away, but your close-up vision (near vision) is blurry.

Astigmatism

Astigmatism is a common vision problem caused by an error in the shape of the cornea.

Presbyopia

Presbyopia is an eye condition in which your eye slowly loses the ability to focus quickly on objects that are close.

conjunctivitis

Conjunctivitis, commonly known as “pink eye,” is an infection or swelling in the outer membrane of your eyeball.

Allergic Conjunctivitis

When your eyes are exposed to substances like pollen or mold spores, they may become red, itchy, and watery.

Foreign Object in the Eye

A foreign object in the eye is something that enters the eye from outside of the body.

cataracts

You use the lens of your eye every day, for everything from reading to driving to bird watching.

Eyelid Inflammation (Blepharitis)

Your eyelids are the folds of skin that cover your eyes and protect them from debris and injury.

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Eyelid Bump

Eyelid Bump

Three kinds of eyelid bumps are styes, chalazia, or xanthelasma. Most eyelid bumps go away on their own with home treatment, but see your doctor if they continue to grow, affect your vision, or show symptoms of infection, such as discharge.

Eyelid Turned In (Entropion)

Eyelid Turned In (Entropion)

Entropion refers to a condition in which your eyelid rotates inward. Your eyelashes rub against your eye and cause redness, irritation, and abrasions on the cornea of your eye. Entropion, or eyelid retraction, develops slowly and may not be noticeable in its early stages. Over time, however, the condition worsens until every movement of the eye irritates the surface of the cornea.

Eyelid Twitch

Eyelid Twitch

An eyelid twitch, or blepharospasm, is a repetitive, involuntary spasm of the eyelid muscles. A twitch usually occurs in the upper lid, but it can occur in both the upper and lower lids. For most people, these spasms are very mild and feel like a gentle tug on the eyelid.