written or reviewed by
L. Dean Flanders, M.D.

Are Cataracts Contagious?

Cataracts are one of the most common eye conditions, particularly among older adults. If you or someone you know has been diagnosed with cataracts, you might wonder: Can cataracts spread from one eye to the other? Are they contagious like a virus? The good news is the answer is no. Cataracts are not contagious, and they do not spread between people or from one eye to the other.

What are Cataracts?

A cataract is a progressive clouding of the eye’s natural lens that can lead to loss of vision. This clouding occurs due to changes in the proteins and fibers within the lens, leading to blurred or diminished vision over time. Cataracts typically develop as part of the aging process, usually in a person’s 60’s or 70’s, but they can also be caused by factors such as excessive UV exposure, smoking, diabetes, certain medications, and eye injuries.

Can Cataracts Spread Between Eyes?

Cataracts do not spread from one eye to the other because they are not caused by an infection. However, it is possible for cataracts to develop in both eyes independently, often as a result of aging or shared risk factors. While one eye may develop a cataract sooner than the other, both eyes can eventually be affected over time.

Are Cataracts Contagious to Others?

No, cataracts are not contagious. Unlike infectious diseases such as the flu or conjunctivitis (pink eye), cataracts cannot be passed from one person to another. They develop due to internal changes within the eye, not because of bacteria, viruses, or direct contact.

Treating Cataracts

If cataracts begin to interfere with daily activities such as reading, driving, or recognizing faces, cataract surgery is the only effective treatment. This procedure involves removing the clouded lens and replacing it with a clear artificial intraocular lens (IOL). Cataract surgery is one of the safest and most commonly performed procedures, with a high success rate in restoring vision.

Protecting Your Eye Health

While cataracts are not preventable in all cases, you can take steps to slow their progression and maintain healthy vision:

• Wear sunglasses with UV protection.
• Maintain a healthy diet rich in antioxidants.
• Avoid smoking and heavy alcohol use.
• Manage underlying health conditions such as diabetes.
• Schedule regular eye exams to monitor eye health.

Cataracts may affect your vision, but you do not need to worry that they are contagious. If you live in the Washington, DC area and are experiencing cataract symptoms such as blurry vision, glare sensitivity, or difficulty seeing at night, schedule an appointment with one of Washington Eye Physicians and Surgeons’ cataract specialists. Early detection and monitoring can help you maintain clear vision and determine the best time for treatment.