Health A-Z

Eye Health

Your eyes are your windows to the world. Learn how to maintain your eye health and what to expect from exams and treatments for common vision problems.

Astigmatism Test: Eye Exam and Online Test

Medically reviewed by Johnstone M. Kim, MD

For Stye Treatment article

How to Get Rid of a Stye

Medically reviewed by Bryan M. Wolynski, OD

tear duct infection

What Is Dacryocystitis?

Medically reviewed by Johnstone M. Kim, MD

Bacterial pink eye

Bacterial Conjunctivitis (Pink Eye): Overview and More

By Luana Ferreira

Explore Eye Health

What Is Nyctalopia (Night Blindness)?

Medically reviewed by Bryan M. Wolynski, OD

Ophthalmologist doctor with the snellen chart

Symptoms of Astigmatism

Medically reviewed by Bryan M. Wolynski, OD

Watery Eyes: Overview and More

By Rachael Zimlich, BSN, RN

How Long Is Pink Eye Contagious?

Medically reviewed by Johnstone M. Kim, MD

What Causes Eye Floaters?

Medically reviewed by Johnstone M. Kim, MD

For What Causes a Stye?

Styes: Causes and Risk Factors

Medically reviewed by Johnstone M. Kim, MD

What Is Farsightedness (Hyperopia)?

Medically reviewed by Bryan M. Wolynski, OD

Viral conjunctivitis is highly contagious.

What You Should Know About Viral Conjunctivitis

Medically reviewed by Bryan M. Wolynski, OD

Close-up of young woman

Living With Thyroid Eye Disease

Medically reviewed by Ami A. Shah, MD

close up of eyes of man and woman

Causes and Risk Factors of Thyroid Eye Disease

Medically reviewed by Ami A. Shah, MD

woman at eye doctor

How Thyroid Eye Disease Is Diagnosed

Medically reviewed by Ami A. Shah, MD

Close-up of woman putting in eye drops

How Thyroid Eye Disease Is Treated

Medically reviewed by Ami A. Shah, MD

Young woman checking her eye in the mirror

Symptoms of Thyroid Eye Disease

Medically reviewed by Ami A. Shah, MD

a woman taking care of her eyes

How Do I Treat My Dry Eyes?

Medically reviewed by Ami A. Shah, MD

bag under the eye women

Why Are My Eyes Puffy?

Medically reviewed by Ami A. Shah, MD

close-up of eye

What Are Monolids (Epicanthal Folds)?

Medically reviewed by Johnstone M. Kim, MD

What Is Hypertropia?

Medically reviewed by Bryan M. Wolynski, OD

Types of Eye Infections

By Lana Bandoim

Close-up of brown eye

What Is the Most Common Eye Color?

By Lana Bandoim

For Erythromycin Ointment

What to Know About Erythromycin Eye Ointment

By Mali Schantz-Feld

Man having an eye exam at ophthalmologist's office

What Is a Marcus Gunn Pupil?

By Elizabeth Yuko, PhD

Detail of a person's eye

Blurry Vision in One Eye

By Elizabeth Yuko, PhD

Female patient undergoing laser eye surgery at clinic

Eye Surgery to Correct Vision Problems

Medically reviewed by Johnstone M. Kim, MD

Woman at optometrist

What Is the Difference Between an Optometrist and an Ophthalmologist?

Medically reviewed by Ami A. Shah, MD

eye and letters

How To Improve Your Eyesight

By Brian Mastroianni

color blindness test

What Is a Red-Green Color Blind Test?

Medically reviewed by Bryan M. Wolynski, OD

Man takes photo with phone on rock empire

What Do Color-Blind People See?

By Margaret Etudo

What Causes Double Vision?

By Luana Ferreira

What Causes Eyelid Pain?

Medically reviewed by Johnstone M. Kim, MD

a woman tired from looking at her laptop

Do Eye Exercises Improve Your Vision?

Medically reviewed by Johnstone M. Kim, MD

Young woman applying eye drops

What to Know About Prednisolone Eye Drops

By Rachel Macpherson

halos around lights

What Causes Halos Around Lights?

Medically reviewed by Johnstone M. Kim, MD

a man looking a computer

Do Blue Light Glasses Work?

By Luana Ferreira

How Long Does Lasik Surgery Last?

How Long Does LASIK Surgery Last?

By Mali Schantz-Feld

optician testing eyesight

How To Test for Depth Perception

Medically reviewed by Johnstone M. Kim, MD

man with hordeolum ill eye

How Long Does a Stye Last?

Medically reviewed by Johnstone M. Kim, MD

Applying eye ointment to the inside of the lower lid

How to Use Antibiotic Eye Ointments

Medically reviewed by Johnstone M. Kim, MD

woman putting eye drops in her eyes

Can I Use Neosporin for My Eye Infection?

Medically reviewed by Ami A. Shah, MD

An ophthalmologist performs an eye exam

How To Get Rid of Eye Floaters

Medically reviewed by Johnstone M. Kim, MD

Images show what to expect during an eye exam.

What is an Optometrist?

Medically reviewed by Ami A. Shah, MD

close up of woman with brown eyes

What Is the Rarest Eye Color?

Medically reviewed by Ami A. Shah, MD

Man takes Durezol eyedrop to soothe pain, redness and swelling.

What to Know About Durezol Eye Drops

Medically reviewed by Bryan M. Wolynski, OD

Portrait of stylish young man sitting on sidewalk

The 8 Best Places to Buy Glasses Online in 2021

Fact checked by Ashley Hall

An Overview of Coloboma

By Sherry Christiansen

At optician's office.

A Retinal Tear Can Cause a Retinal Detachment

Medically reviewed by Johnstone M. Kim, MD

What to Know About Rhythmic Eye Jerking in Nystagmus

Medically reviewed by Johnstone M. Kim, MD

A Baby and her doctor

Aniridia—A Genetic Eye Disorder Affecting the Iris

Medically reviewed by Johnstone M. Kim, MD

Woman putting cleaning dilution into contact lens case

The 10 Best Contact Lens Solutions of 2021

Fact checked by Ashley Hall

Woman talking with eye doctor

What Your Blind Spot Really Is

Medically reviewed by Bryan M. Wolynski, OD

A close-up of an older man's eyes.

Charles Bonnet Syndrome: Symptoms, Causes, Diagnosis, and Treatment

Medically reviewed by Johnstone M. Kim, MD

Doctor examining man's eyes

How Epiretinal Membrane Can Affect Your Vision

Medically reviewed by Johnstone M. Kim, MD

Young man, close-up (focus on eye)

Eye Movement Disorders of the Eyes

Medically reviewed by Ami A. Shah, MD

Woman getting cornea examined at doctor

How Corneal Haze Can Affect Your Vision

Medically reviewed by Johnstone M. Kim, MD

Do Your Eyes Have Emmetropia?

Medically reviewed by Johnstone M. Kim, MD

Learn All About Tunnel Vision

Medically reviewed by Johnstone M. Kim, MD

Doctor looking at patient through glasses

The Grey Ring in Your Eye May Be Arcus Senilis

Medically reviewed by Ami A. Shah, MD

Why Are Your Eyes Discolored or Yellow?

Medically reviewed by Johnstone M. Kim, MD

Optician looking into patients eyes at small business opticians

Papilledema: Swelling Behind the Eye

Medically reviewed by Johnstone M. Kim, MD

Learn What It Means to Have 20/20 Vision

Medically reviewed by David R. Watt, MD

A bridge beginning close and ending at a distance

Discover How Depth Perception Works

Medically reviewed by Johnstone M. Kim, MD