Learn about the anatomy of your eyes and how each part of the eye works in order to create visual output.

The area that you can see at one time without moving your eyes is called your field of vision or visual field.

Acuity of vision is a term used to describe the clearness or sharpness of your vision when measured at a distance of 20 feet.

Your eyesight depth perception is how images appear three-dimensional (3-D).

Ocular dominance is when you use one eye more than the other, have better vision in one eye, or can fixate on something better with one eye.

Fact or fiction? Get the truth about what's actually good or harmful for your eyes and vision.

In middle age, your eyes go through changes. Most are related to how well you see. Vision problems are often the first signs of aging.

To keep your eyes in good shape, it’s important to see an eye doctor at least once every couple of years as an adult.

There are two main types of eye doctors: ophthalmologists and optometrists. Here's a look at how they're different.

Neuro ophthalmologists specialize in vision problems that relate to your nervous system due to brain injuries or diseases.

How often you go for eye exams depends on a number of factors such as your age, family history, and other risks.

Vision screening is a simple test that detects problems early. An eye exam is a detailed check of your eyes and eye health.

Test your eyesight without a trip to the eye doctor? Online vision tests aim to make it possible.

Don’t skip your annual eye exam because you think you can see just fine. Eye exams aren’t only for people with poor vision.

You’ve probably had a PERRLA eye exam during a checkup with your doctor or before an eye exam.

Ophthalmoscopy is an exam your doctor, optometrist, or ophthalmologist uses to look into the back of your eye.

Retinal imaging takes a digital picture of the back of your eye. It shows the retina, the optic disc, and blood vessels.

Dilation is part of a thorough eye exam. You may think it’s a hassle. But it gives your doctor a good look inside your eye.

is it safe to drive yourself home after your eyes are dilated? The answer depends on a few things.

Don't take your eyes for granted. Take these easy steps to keep your peepers healthy.

Doctors may also recommend eye exercises for conditions involving how your eyes work together.

When you have a dry, itchy or painful eye problem, you want to feel better. One way to do this is with a warm compress.

Eyewash solutions are a safe way to ease irritated eyes when you’re at home or on the go.

A clinical trial showed that a commercial eye drop made with Damask rose could be helpful for several eye conditions.

Eye drops can help correct a lazy eye, delay glaucoma’s onset, or moisten dry eyes. Eye drops can do more than ever before.

Do you know how to use eye drops properly? Here are 10 tips to help you insert drops in your eyes the correct way.

Castor oil has many healing properties and is used as a holistic eye treatment.

Ointments are used to treat many eye problems. They can start to work much faster than an oral medicine.

What can you do to protect your eye health and eyesight using vision supplements? Here is information to help you decide.

Lutein and zeaxanthin can help protect your eyes from harmful high-energy light waves like ultraviolet rays in sunlight.

Researchers think vitamin E plays a role in protecting certain parts of the eye, which is susceptible to oxidative damage. 

Zinc is essential for eye health. This mineral helps vitamin A create a pigment called melanin, which protects your eye.

The delicate tissues inside and around your eye need protection. Find out what causes most eye injuries, and how to prevent them.

Here are some quick first aid treatments for the most common eye injuries.

If your eye's own tears won't wash an object out of your eye, there are a few other things you can try. 

Chemical exposure to any part of the eye or eyelid may result in a burn. Permanent damage is possible and can be blinding.

When something injures your eye, quick action may prevent long-term problems to your eye or your vision.

Here are some simple steps you can take to protect your eyes when you’re in the kitchen, and prevent injuries.

A subconjunctival hemorrhage is a red spot on your eye caused by a broken blood vessel.

Injuries can cause bleeding in the front of your eye, between the cornea and the iris. This bleeding is called a hyphema.

A black eye is a bruise to the eyelid skin usually caused by an injury to the face.

Raccoon eyes are dark purple or blue bruises under your eyes. Doctors sometimes call raccoon eyes periorbital ecchymosis.

Besides icy treatment, there isn’t much you can do except to avoid anything that could cause further injury to your eye.

Eye removal a drastic procedure that doctors do as a last resort if no other treatment for a serious eye condition provides relief.

The right sunglasses can protect your eyes for years, but the wrong kind can do more harm than good.

If your eyes are often red, you might wonder if whitening drops can help. They’re easy to get OTC, but are they safe?

Colored contact lenses look like a fun way to change up your look. But they may harm your eyes if you don’t use them right.

Artificial eyelash extensions sometimes may lead to side effects, for your eyes as well as your natural lashes.

Many people use eyelash extensions and serums to get the look they want, but you may wonder if they’re a safe choice.

You may have heard about surgeries that promise to turn your eyes whatever color you want. But they might not be the safest.

Eyeball tattoos are considered one of the most extreme tattoos a person can get and are widely known for their dangers.

A prosthetic eye can help improve the appearance of people who have lost an eye to injury or disease.

Does your baby really need an eye exam in their first year? Absolutely. 

Preemies are more likely to have health problems, including eye conditions.

The smaller and more pre-term a baby is at birth, the greater their chance of having retinopathy of prematurity (ROP).

What if when you look into your newborns eyes, you see that they have sticky discharge? Is it something to be concerned about?

Buphthalmos means that one or both eyeballs are larger than normal and is typically noticed when your child was born or shortly after. 

One out of every 4 kids has trouble with eyesight. That's why all children should get regular eye exams.

If your doctor says your child is myopic or has myopia, that means they're nearsighted. They can't see objects far away clearly.

If your infant has been diagnosed pseudostrabismus, it means they have a condition where their eyes appear to be misaligned but are not.

Find out what tests could be done at your child's eye exam and what the doctor is checking for.

If your child struggles with their vision, their doctor might suggest vision therapy, a highly specialized field of treatment.

At first glance, the words "contacts" and "children" may not seem like they belong in the same sentence, but it could work.

There are many things you can do to keep your child's eyes healthy and seeing clearly.

If you've just learned that your child is visually impaired, there are tips for managing your child's condition.

A retinoblastoma is a cancerous tumor on a part of your child’s eye called the retina, it’s highly curable if you catch it early.

Primary congenital glaucoma is a serious condition that needs attention. It affects children between birth and 3 years.

A dermoid cyst around the eyes is an abnormal growth of non-cancerous tissue that forms when the baby is in the uterus.

A coloboma is a condition in which a baby is born with tissue missing from inside or around the eye.

Brown syndrome is a condition that affects your child’s eye movements. It is usually a congenital disability seen at birth.

Most people have had an eye problem. Some are minor and go away on their own, or are treatable at home. Others need expert care.

If your eyes are dry and itchy, there could be many causes. But chronic dry eyes could be caused by an ocular surface disease.

Your eyes change as you age. Some problems become more common as you get older, although they can affect anyone at any age.

Carotid cavernous fistula is a condition that affects your eye. It can come on suddenly after a head injury or slowly over time.

If you have photophobia, you are very sensitive to light. The sun or bright indoor light can be uncomfortable, even painful.

Snow blindness is temporary eye pain and discomfort after exposure to too much UV light. It’s like a sunburn on your eyes.

A freckle in your eye might seem odd, but they’re actually common and usually harmless.

When The white part of your eye (called the sclera) is inflamed and hurts, doctors call that condition scleritis.

Nearly everyone has had sore eyes. Sometimes they get better on their own, but pain can also be a sign of something serious.

Red eyes happen when the tiny blood vessels on the surface of the whites of your eyes expand and turn pink or reddish.

An eye twitch is an eye muscle or eyelid spasm that you can't control. Twitching is common and often not a cause for concern.

Dry weather and other things can wreak havoc on your eyes. Here are some things that might bug your eyes, plus ways to fix them.

Excessive blinking is when you blink more than normal. It may happen all the time or every once in a while.

Spring can lead to itchy eyes. So can infection and other conditions. But they usually aren’t a sign of something serious.

Rosacea causes redness and acne-like bumps on your face. When it affects your eyes, it's called ocular rosacea.

An infection in your eye can show up in many different ways. A lot depends on which part of your eye has the problem.

Blinking washes away the mucus your eyes make all day long. When you're asleep, you don’t blink that gunk away.

Conjunctivitis, often called "pink eye," is one of the most common and treatable eye conditions in children and adults.

Pink eye causes redness, itching, pain, burning, discharge, and swelling in and around the eyes.

Symptoms of pink eye vary depending on the type of pink eye you have.

Sometimes the symptoms of pink eye go away without medical treatment. You can use home remedies to feel better in the meantime.

Though it's named for a certain type of athlete, this common eye growth can affect anyone who spends a lot of time outdoors.

If you notice a small, yellow bump on your eyeball, it could be a pinguecula. While not dangerous, it can cause some discomfort.

The conjunctiva is the clear membrane that covers the white part of the eye. Conjunctival chemosis is a swelling of the membrane.

‌Giant papillary conjunctivitis causes swelling, redness, and irritation in the lining of the membrane inside your eyelids.

When your lacrimal gland doesn’t make enough tears, it causes dry eye. Another name for this type is keratoconjunctivitis sicca.

If your glands don't produce enough tears, you can get a condition called aqueous tear-deficient dry eye.

Are your eyelids swollen and your eyes dry and itchy? Is it worse in the morning? You might have evaporative dry eye.

Sometimes, there's a lack of balance in your tear-flow system. Or your AC, heater, or other things could dry out your tear film.

When a person’s eyes do not make enough tears to stay wet, or when tears don’t work the way they should, this can cause dry eye. People with dry eyes often have a scratchy feeling in the eye, as though there is something there.

There are many reasons you can have dry eyes. Allergies are one possible explanation.

Dry eye is the most common complication for LASIK. About 95% of people report dry eye symptoms just after the procedure.

If your eyelids don't shut completely while you sleep, part of your eye is exposed to the air. That can lead to dry eye.

Many things can cause your eyes to feel dry, gritty, and sore. Dry eyes can also be related to immune system conditions.

Dry eyes can be related to problems with your thyroid gland. Sometimes they may be the first sign of a thyroid disease.

Inflammation can contribute to dry eyes. In turn, dry eyes can make eye inflammation worse.

There are several skin conditions that can cause dry eye or make it worse.

Dry eyes can be caused by allergies, medications, certain medical conditions, hormones, and, yes, age.

Medications lead to dry eye in many ways. They can cut the number of tears you make or change the mix of ingredients in them.

Nearly 60% of Americans use a digital device for at least 5 hours a day. That screen time can cause dryness and eye irritation.

Smoking is a common trigger for dry eye. You can try to prevent the problem. Or you can treat your symptoms when they happen.

Some people with dry eye swear off coffee and tea, assuming they make the problem worse. But some research suggests the opposite.

If you're bothered by dry eye, it's possible your hormones are to blame.

Your environment can trigger dry eye disease or make it worse. Luckily, you may be able to make changes to ease the discomfort.

You can do a lot to help your dry eyes feel better. But you could be doing things that aren't helping and not even know it.

No matter why you have dry eye, it’s good to know when to touch base with your doctor to get the treatment you need.

If you’re dealing with dry eye symptoms, an eye doctor can help you figure out what's causing them and how to treat them.

If left untreated over the long term, dry eye may lead to complications like infection, inflammation, and scarred corneas.

Although no cure exists for dry eye syndrome, many treatments are available.

If your dry eyes itch, burn, or sting, punctal plugs may be just the thing to relieve your symptoms.

You use different types of drops to treat different problems, like allergies vs. dry eyes. The wrong drops may worsen symptoms.

Dry eye is more than just uncomfortable. It can hurt your vision. Treatments and some simple actions can bring relief to sore eyes.

Cequa is a safe and effective over-the-counter (OTC) eyedrop for treating dry eyes by making artificial tears.

There are steps you can take to ease the scratchy, irritating symptoms of dry eyes. Try these home remedies to find relief.

If you’re looking to boost your eye health and help your dry eye symptoms, focus on these key nutrients.

Summer is usually great for dry eyes. But there are a few things that can dry your eyes out during the warmer months.

People with desk jobs have routines and workspaces that make it more likely for them to have dry eye.

When you have dry eyes, your eyes may sting, itch, or water. It makes it hard to wear makeup.

If you’ve noticed something’s different about one or both of your eyelids, it’s important to know what to look out for.

Not all eye problems involve your eye itself. Sometimes, they start with your eyelid.

Double eyelids is the crease in some people’s top lids and the absence of extra tissue, which creates the appearance of two lids.

Moderate twitching of your eyelids (also known as myokymia) is common and can be caused by several conditions.

There are many reasons for dry eyelids and lots of ways you can treat it.

Blepharitis is inflammation of the oil glands in your eyelids. It’s the most common cause of dry eyes.

If you have trouble closing your eyes all the way when you blink or sleep, you may have a condition called lagophthalmos.

Eyelid ectropion occurs when the muscles around your eyelid weaken, causing the lid to turn outward and pull away from your eye. 

Do your upper eyelids sag a little or cover your pupil? It could be ptosis, which is a fancy way to say "drooping."

Most people don’t have this problem, but around 5% of people who get Botox will have problems with eyelid droop.

Canthoplasty is a cosmetic procedure that reconstructs the eyelid. It’s sometimes referred to as “almond eye” surgery.

A swollen eyelid happens when fluid collects in the tissues around your eye. You might also have itching or pain.

Periorbital cellulitis is an infection of your eyelid or the skin around your eyes.

Meibomian gland dysfunction is common. You get it when there's a problem with a few dozen tiny glands in your eyelids.

Eyelid bumps come in many forms. They don’t usually cause problems, but some can be a sign of a more serious problem.

A chalazion is a small swelling or lump on your eyelid caused by a blocked gland.

If you notice yellow patches on the inside corners of your eyelids, you might have xanthelasma.

A stye is a pimple or abscess that forms on your upper or lower eyelid. 

If you get a lot of styes, you'll want to get rid of the germs and dead skin cells that bacteria like to feed on.

Most styes burst or go away on their own after several days. But cleaning it will help bring the pus out.

Eyelid scrubs are gentle cleansers that soothe inflamed eyelids and help treat some eye conditions.

Eyelash mites are tiny cigar-shaped bugs found in bunches at the base of your eyelashes. They’re normal and usually harmless.

Sometimes, your eyelashes grow in the wrong direction. This is a common condition called trichiasis.

Distichiasis (you might hear it called double eyelashes) is a rare condition where you have two rows of eyelashes.

Eye floaters appear as small spots that drift through your field of vision. They might annoy you, but they shouldn’t interfere with your sight.

Floaters come and go and are usually harmless, if annoying. But there are times when floaters could be a sign of a problem.

 If your floaters greatly interfere with your vision or daily life, your doctor may recommend a surgery called a vitrectomy.

If your eyes are watery and irritated, get them checked to find out whether it’s a blocked tear duct.

Blocked tear ducts can happen for different reasons, including the shape of the ducts, an infection -- even your age. 

Several possible reasons you have watery eyes range from allergies to infections, blocked tear ducts, and funny looking eyelids.

There are ways to get relief from blocked tear ducts. Opening up the ducts often eases symptoms like tearing, pain, and redness.

If you see dark specks or flashes of light, it's possible you could have posterior vitreous detachment (PVD).

The vitreous humor lies between the lens and retina inside your eyes. Bleeding into the vitreous humor is a vitreous hemorrhage.

Asteroid hyalosis is a condition that causes an accumulation of lipids and calcium in the vitreous humor of the eyeball.

A virectomy is an operation that removes the vitreous, a jelly-like fluid inside your eye, and replaces it with a saline solution.

If you have blurry vision, you might chalk it up to age or needing new glasses. But it can be a sign of other health problems, too.

The most common forms of impaired vision are errors of refraction. Myopia, hyperopia, and astigmatism are examples.

If you've been experiencing problems with your vision, learn about the symptoms of these common eye conditions.

Periodic comprehensive eye exams by an eye doctor are essential to monitor the health of your eyes and diagnose problems.

It's normal for vision to change as you get older. With good eye care, you can often limit the impact those changes.

Presbyopia is a decline in your vision when your eyes lose the ability to focus on things close to you.

A lazy eye is when the vision of one of your eyes doesn’t develop the way it should. Doctors also call this amblyopia.

Diplopia is when you see two images of the same thing. You might know it as double vision.

Exophoria is a condition in which your eyes drift outward out of your control. It’s not a serious condition and can be corrected.

Convergence insufficiency means you might find it hard to focus your eyes. It’s due to trouble with how your eyes work together.

Palinopsia is when you see an image repeatedly even when the image’s stimulus has gone away.

Myopia, also known as nearsightedness, is a condition that usually can be fixed with eyeglasses, contacts, or eye surgery.

Nystagmus, or "dancing eyes," is a condition where you can't control your eye movements.

Hyperopia, or farsightedness, is when you see things that are far away better than things that are up close.

Bulging eyes, also called exophthalmos, is when your eyes protrude, or stick out more, than normal.

A scotoma is a blind spot in your vision, which is an area you cannot see.

Photopsia can be one of many symptoms that indicate various health problems, including a concussion or an eye structure concern.

Contrast sensitivity is the ability to tell the difference between two similar colors or shades of gray.

If you’re expecting, you might be surprised when your vision changes. Most issues are usually minor and temporary.

Computer vision syndrome isn’t one specific problem. Instead, it includes a whole range of eye strain and discomfort.

Eye strain a common condition but rarely serious. You can take simple steps to prevent or ease this problem.

In cases where eye strain bothering you, there are several exercises you can do to help relieve it faster.

Color blindness means your eye doesn't see color the way it should. Your eyes see differences in the light that comes in.

Eye professionals have a lot of ways to check for colorblindness. The most common tests use colored tablets or diagrams.

When you’re colorblind, basic tasks like driving or picking a ripe apple can get a lot harder. But they don’t always have to be.

Colored lenses and colorblind glasses are available to help you cope with color blindness effectively. 

Night blindness, which your doctor will call nyctalopia, makes it hard to see well at night or in poor light.

A wide range of conditions -- from sun exposure to diabetes -- makes it hard to see at night.

Light is crucial for vision. But sometimes, it’s the source of vision problems, like halos or glare.

 Astigmatism is a condition in which your eye, especially your cornea or the clear front part of the eyeball, isn’t completely round.

The most common symptom of astigmatism is blurred or double vision.

There are ways to check for astigmatism at home. You should still be seen by an eye doctor. Here's what you need to know.

When you have strabismus, or crossed eyes, your eyes point in different directions. It might happen sometimes or all the time.

Esotropia, also known as strabismus, is an eye misalignment that causes one or both eyes to turn inward.

When someone has hypertropia, one eye turns up while the other looks in the right direction.

Strabismus can be treated. Options range from eyeglasses to eye patches to surgery, and exercises for your eyes.

As your eyes get less flexible, your close vision gets worse. It may make you wonder if you need reading glasses.

There are many different types of eyeglass lenses for various lifestyle activities.

As technology advances, so do lenses. New ones are lighter, don’t break as easily as glass, and can be treated with a UV filter.

Pupillary distance, also called interpupillary distance or PD, is a measurement of the distance between your pupils.

Prism lenses are made of plastic or glass and are wedge or triangle shaped.

Aspheric lenses have a varying curve across the lens. They’re a thinner, flatter, upgraded lens.

Photochromic lenses are the type of lens that transitions to a darker color when exposed to the sun or other sources of UV light. 

Progressive lenses have three prescriptions in one pair of glasses. They're sometimes called multifocal lenses.

Bifocals or progressives may change the way you judge distance or depth. Take these steps to get used to wearing them.

Choosing glasses can be hard, especially when you consider how many different types of glasses and face shapes there are.

The exact way you order glasses online depends on the website you use.

If you have a prescription that requires you to wear glasses, you may want to consider a pair of prescription sunglasses, too.

Night driving glasses may help you to see better at night while you’re driving. They’re usually yellow-tinted.

Pinhole glasses, as the name implies, are glasses with tiny holes poked through their lenses.

Scratched glasses could lead to disturbed vision. Scratched lenses can lead to glare, reflections, or blurry vision.

If you don't have 20/20 vision but your eyes are otherwise healthy, you can choose between glasses and contacts to help you see.

Scleral contact lenses are larger than soft lenses. They're firm, hold their shape, and rest on the sclera around the cornea.

If you’ve just gotten fitted with contacts for the first time, you may have questions about how to wear and take care of them.

Contact lenses can make your life a lot easier. But using contacts safely does take some effort.

 If you don't clean and care for your contact lenses correctly, you're more likely to get eye infections.

Follow these steps to extend the life of your contact lenses and keep your eyes safe and healthy.

ICL surgery (also known as EVO Implantable Collamer or Interocular Contact Lens) is an alternative to LASIK.

Vision correction surgery, also called refractive and laser eye surgery, is any surgical procedure used to fix vision problems.

A good candidate for refractive or laser eye surgery is one who will still be OK with wearing glasses under certain situations.

Laser eye surgery is an elective surgery. Many health insurance companies consider it cosmetic and not medically necessary.

Photorefractive keratectomy laser eye surgery can help if you are nearsighted, farsighted, or have astigmatism.

LASIK is a popular surgery that can correct vision in people who are nearsighted or farsighted, or who have astigmatism.

Both LASIK and PRK use a laser to reshape the cornea. But they do it in slightly different ways.

LASEK is an eye surgery that combines many of the benefits of other vision correction surgeries.

With the rise of more effective procedures like LASEK, LASIK and PRK, radial keratotomy is now considered outdated.

SMILE is a surgical procedure that works by reshaping your cornea. This focuses light accurately on your retina.

Astigmatic keratotomy eye surgery corrects astigmatism by making one or two incisions at the steepest part of the cornea.

After laser eye surgery, take these precautions to prevent injury or infection.

Eye patches can help treat some types of vision problems, especially in the case of children.

Syntonic phototherapy has been used for over 80 years for the treatment of lazy eyes, eye turn, and problems with eye focusing.

Orthokeratology is a noninvasive and nonsurgical process, during which specially designed contacts are fitted to a patient.