Presbyopia

What Is Presbyopia?

Presbyopia is an eye condition in which your eye slowly loses the ability to focus quickly on objects that are close. It’s a disorder that affects everyone during the natural aging process.

When light enters your eye, it passes through your cornea. Then, it passes through your pupil. Your iris is the colored ring in your eye that opens and closes your pupil to adjust the amount of light passing through it. After passing through your pupil, the light passes through your lens. In its healthiest state, your lens changes shape so it can bend the light rays further and focus them on your retina at the back of your eye. However, your lens becomes less flexible with age. Then, it can’t change shape as easily. As a result, it’s unable to bend the light properly to focus it on your retina.

Symptoms of Presbyopia

The most common symptoms of presbyopia occur around age 40 for most people. The symptoms of presbyopia typically involve a gradual deterioration in your ability to read or do work up close.

Common symptoms of presbyopia are:

  • having eyestrain or headaches after reading or doing close work
  • having difficulty reading small print
  • having fatigue from doing close work
  • needing brighter lighting when reading or doing close work
  • needing to hold reading material at an arm’s distance to focus properly on it
  • overall problems seeing and focusing on objects that are close to you
  • squinting

Hyperopia, or farsightedness, is a condition that has symptoms similar to presbyopia. However, they’re two different disorders. In both conditions, distant objects are clear but closer objects appear blurred.

Hyperopia occurs when your eye is shorter than normal or your cornea is too flat. With these malformations, the light rays focus behind your retina, as in presbyopia. However, hyperopia is a refractive error that’s present at birth. It’s possible to have hyperopia and then develop presbyopia with age.

Causes of Presbyopia

When you’re young, the lens in your eye is flexible and relatively elastic. It can change its length or shape with the help of a ring of tiny muscles that surround it. The muscles that surround your eye can easily reshape and adjust your lens to accommodate both close and distant images.

With age, your lens and the muscle fibers surrounding your lens slowly lose flexibility and stiffen. As a result, your lens becomes unable to change shape and constricts to focus on close images. With this hardening of your lens, your eye gradually loses its ability to focus light directly onto your retina.

Risk Factors for Presbyopia

The most significant risk factor for presbyopia is age. Most people lose some ability to focus on close objects by age 40. It affects everyone, but some people notice it more than others.

Certain diseases or drugs can cause presbyopia in people younger than age 40. When the symptoms of presbyopia occur earlier than usual, it’s called premature presbyopia. If you notice the symptoms of presbyopia at an age earlier than normal onset, it may be a sign of an underlying medical condition.

You’re at a higher risk of premature presbyopia if you have:

  • anemia, which is a lack of enough normal blood cells
  • cardiovascular disease
  • diabetes, or difficulties metabolizing blood sugar
  • hyperopia, or farsightedness, which means you have a greater difficulty seeing objects nearby than objects that are far away
  • multiple sclerosis, which is an autoimmune disease that affects your spine and brain
  • myasthenia gravis, which is a neuromuscular disorder that affects your nerves and muscles
  • eye trauma or disease
  • vascular insufficiency, or poor blood flow

Diagnosis of Presbyopia

Contact your doctor or eye specialist if you have any of the symptoms of presbyopia. Even if you’re not experiencing symptoms, you should have an eye examination by age 40.

According to the Foundation of the American Academy of Ophthalmology, adults who don’t have any symptoms or risk factors associated with eye disease should have a baseline examination at age 40. An eye screening can identify early signs of disease and vision changes that can begin, sometimes without any symptoms, around this age.

Presbyopia can be diagnosed as part of a comprehensive eye examination. A typical exam will include tests to evaluate your eyes for the presence of diseases and vision disorders. Your pupils will probably be dilated with special eye drops to allow your doctor to examine the inside of your eye.

Treatment of Presbyopia

No cure exists for presbyopia. However, there are several treatments available to correct your vision. Depending on your condition and lifestyle, you may be able to choose from corrective lenses, contact lenses, or surgery to correct your vision.

If you didn’t need eyeglasses before getting presbyopia, you might be able to use nonprescription reading glasses. These readers are typically available at retail stores, such as drug stores. They typically work best for reading or close work.

When selecting a pair of nonprescription reading glasses, try different degrees of magnification. Choose the lowest magnification that allows you to read a newspaper comfortably.