FAQs on Cataract

FAQs on Cataract

A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are common in older individuals. By age 80, more than half of all Americans either have a cataract or have undergone cataract surgery.

A cataract can manifest in either or both eyes. It cannot transfer from one eye to another.

What is the lens?

The lens is a clear component of the eye that aids in focusing light, or an image, onto the retina. The retina is the light-sensitive tissue situated at the back of the eye.

In a healthy eye, light traverses the transparent lens to the retina. Here, light is transformed into nerve signals that the brain interprets.

For the retina to receive a sharp image, the lens must remain clear. A cloudy lens due to a cataract results in a blurred vision.

Types of Cataract

While most cataracts are age-related, various types exist:

• Secondary cataract: Forms post-surgery for other eye conditions, like glaucoma. Also associated with diabetes and steroid use.
• Traumatic cataract: Arises after eye injury, possibly years post-injury.
• Congenital cataract: Present at birth or developed in childhood. May necessitate lens removal if vision is affected.
• Radiation cataract: Occurs after specific radiation exposure.

Causes and Risk Factors

What causes cataracts?

The lens, situated behind the iris and the pupil, operates similarly to a camera lens. It focuses light onto the retina. Over time, proteins in the lens may clump, forming a cataract.

Various factors, like smoking and diabetes, may cause cataracts. Aging and wear and tear on the lens can also lead to cataracts.

How cataracts affect vision

Cataracts can:

1. Result in reduced image sharpness due to protein clumps.
2. Add a brownish tint to vision as the lens discolors.

When are cataracts likely?

While termed "age-related", cataracts can appear in individuals as young as in their 40s. Cataracts predominantly affect vision post the age of 60.

Risk factors

Risks include aging, diabetes, smoking, alcohol use, and prolonged sun exposure.

Symptoms and Detection

Cataract symptoms

Common signs include:

• Cloudy or blurred vision.
• Faded colors.
• Glare or halo around lights.
• Poor night vision.
• Frequent prescription changes.

It's crucial to consult an eye professional if these symptoms appear.

Detection

Cataracts are identified through comprehensive eye exams including:

1. Visual acuity test: Measures vision at varying distances.
2. Dilated eye exam: Examines retina and optic nerve post pupil dilation.
3. Tonometry: Assesses eye pressure.

Treatment

How are cataracts treated?

If early symptoms don't improve with eyeglasses or brighter lighting, surgery is the subsequent step. The surgery entails replacing the cloudy lens with an artificial one.

Decision for surgery is based on how much the cataract affects daily activities.

Cataract surgery types

• Phacoemulsification (phaco): A small incision is made to insert a probe, breaking up the lens for removal.
• Extracapsular surgery: Removes the lens' cloudy core.

Post natural lens removal, it's usually replaced with an intraocular lens (IOL).

Risks of cataract surgery

Like any surgical procedure, risks include infection and bleeding. Cataract surgery can also slightly raise the risk of retinal detachment. Immediate medical attention is essential if symptoms of retinal detachment, like increased floaters or flashes, arise.

Adapted from NIH info on cataracts