What is presbyopia, and which treatments can help?

Why does near focus change with age?

Looking into the distanceLooking up close

Younger lensOlder lens+

The eye’s natural lens sits behind the coloured iris. In a younger eye, the focusing system changes the lens shape: it becomes rounder for a nearby book or phone, then flatter for the distance. This automatic adjustment is called accommodation.

Over time, the lens becomes stiffer and less able to respond. Presbyopia is often noticeable in the forties, although the timing varies. Holding a menu farther away may help at first; eventually your arms cannot make up for the missing near focus.

The illustration compares flexibility, not cloudiness. A lens can be clear yet unable to focus comfortably at reading distance. A cataract is different: the lens becomes cloudy. The two can occur together later in life.

How does a rounder lens increase focusing power?

More curved lens surfaces bend light more sharply. In the comparison below, the same parallel light rays meet farther away after the less curved lens, but closer after the rounder lens. The lens-to-focus distance is its focal length. A shorter focal length means greater focusing power.

Less curved: longer focal length

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Rounder: shorter focal length

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The blue dot is the focal point; the bracket shows the focal length. 

How does this help the eye focus on a nearby book?

Light from a close book spreads out more than light from something far away. To bring it together on the retina, the eye needs extra focusing power. A flexible lens becomes rounder to provide that extra power. The retina stays in the same place; the lens adjusts the focus to reach it.

Flexible lens: near image in focus on the retina

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Stiffer lens: near focus would fall behind the retina

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Both eyes are trying to focus on the same close object. In presbyopia, the lens cannot become round enough, so the near image is blurred on the retina. 

Moving the book or phone farther away makes the incoming light less spread out, reducing the extra focusing power needed. That can help in early presbyopia. The age-related problem is the lens’s reduced flexibility. The cornea provides most of the eye’s overall focusing power, while the lens supplies the adjustable part.

Further explanation: Short-sighted before cataract surgery: should you keep your near vision?.

How do I know whether it is presbyopia?

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A gradual change in close-up vision is typical. Small print may be harder to read, your phone may drift farther from your face, and prolonged close work may leave your eyes tired. Distance vision can still be good.

An eye examination checks your prescription and eye health. Dry eye, an uncorrected glasses prescription, cataract or retinal disease can also cause blur, so a new symptom should not be diagnosed by age alone. Sudden blur or a marked difference between the eyes needs assessment.

This guide to refractive errors explains myopia, hyperopia and astigmatism. Previous LASIK, PRK or SMILE changes the cornea; it does not stop the natural lens ageing.

↔Blurred close-up printWith suitable correction+

What are my treatment options at a glance?

The right starting point is the task you want to make easier. Reading a book, using a desktop screen and driving at night need different kinds of focus. You may prefer different corrections for different activities.

Which glasses suit reading and computer work?

Reading glasses add near focus while you wear them. They are a good choice if your distance vision is already comfortable. A prescription can account for different needs in each eye and astigmatism; ready-made readers have the same power in both lenses.

Progressive glasses combine distance, intermediate and near zones in one pair. They can be convenient if you also need distance correction, although you need to learn where to look through the lens.

Computer or occupational glasses can provide a wider useful area at screen and desk distances. Tell your optometrist how far away your screen is; a pair suited to a close book may be too strong for a monitor. Glasses designed only for desk work are not for driving.

Use a comfortable working distance, good reading light and larger text. Choosing glasses does not mean you have failed to treat presbyopia. It is a flexible option that can be updated as your needs change.

Can contact lenses help me avoid reading glasses?

Yes, for some people. Multifocal contact lenses provide more than one focusing power in each lens. Another option is distance contact lenses with reading glasses when needed. Comfort, dry eye, lens care and how much fine detail you need all affect the choice.

Contacts may reduce glasses use without making every task equally sharp. Try them during your usual day: phone messages, a computer, shopping, sport and evening travel. A fitting trial is more useful than choosing from a label alone.

What is monovision, and should I try it first?

Monovision gives one eye a distance focus and the other a closer focus. Your brain combines the two views. It can be created with contacts, corneal laser treatment or lens implants.

Some people adapt well; others dislike the difference between their eyes. Depth judgement and low-light visual quality may be affected, and glasses may still help for demanding tasks. A smaller difference, sometimes called mini-monovision, may feel easier but usually provides less close-reading help.

A contact-lens trial lets you experience the compromise before committing to a lasting surgical target. Include activities that matter to you, particularly driving, steps, sport and detailed work. For how focus targets are planned with implants, see glasses after cataract surgery.

One eye targets distance

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The other targets closer work

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Monovision gives the eyes different targets. Your brain must adapt to using them together.

What about pupil-constricting eye drops?

Some prescription miotic drops make the pupil smaller, increasing the range that appears in focus, rather like a pinhole. They may temporarily help near vision; they do not soften the ageing lens. Effects and suitability vary. Headache, irritation and dimmer vision can occur, and retinal precautions matter, particularly with short-sightedness or retinal disease. Ask your ophthalmologist about retinal assessment, suitability and local availability. New flashes, floaters or loss of vision need urgent assessment.

Can laser eye surgery treat presbyopia?

Corneal laser treatment changes the front surface of the eye to compensate for lost near focus, commonly with monovision or a related blended-focus approach. It does not make the natural lens flexible again, and near-vision needs can continue to change.

Suitability depends on your prescription, corneal shape and thickness, and the eye surface. Dry eye, glare or halos, an imperfect result and further correction are possible. Glasses may still be needed. A corneal refractive surgeon can assess these options; the decision is different from choosing lens replacement surgery.

When might lens replacement be considered?

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Refractive lens exchange removes a clear natural lens and replaces it with an artificial intraocular lens. Cataract surgery replaces a lens that has become cloudy. Both require choosing a focus target and balancing glasses use against visual quality.

A monofocal implant offers one main focus and relatively few optical side effects. Reading glasses are usually needed when both eyes target distance. Extended-depth-of-focus implants extend the useful range, often towards computer distance; multifocal or trifocal implants aim for a broader range including near. Halos and reduced contrast may accompany greater range. Compare extended-depth-of-focus and multifocal lenses and the wider lens choices.

No implant is perfect. Infection, retinal detachment and other complications can threaten sight, and glasses or further treatment may be needed. At 45, with a clear lens, replacement is a significant decision; strong short-sightedness adds particular retinal-detachment concern. Glasses, contacts and waiting remain reasonable alternatives.

How do I choose an option that fits my life?

Bring examples of the tasks that are difficult and say which trade-offs you would accept. A useful assessment looks at the whole eye and your daily priorities, rather than age or a desire to stop wearing glasses alone.

• Do I mainly need help with a phone, books, a screen or all three?
• How important are night driving, fine detail and depth judgement?
• Would I accept glasses for some tasks to preserve visual quality?
• Can I try contacts or monovision before making a lasting change?
• How do my cornea, dry eye, retina, prescription or previous surgery affect the options?

If glasses work well, there is no need to rush into surgery. If cataract is also affecting your vision, its timing and surgical plan belong in the discussion. Your visit explains how to prepare for an assessment.

When should I seek urgent advice?

Presbyopia develops gradually. Seek urgent eye care for sudden loss of vision, new flashes or many new floaters, a curtain or shadow, a painful red eye, or new double vision. Contact your eye-care professional promptly; if you cannot obtain urgent advice, attend an emergency department. Do not wait for a routine presbyopia appointment.