Laser vision correction
- Reshapes the front surface of the eye; the natural lens stays in place
- Suits many younger eyes with a stable prescription
- Does not address the loss of near focus that comes with age
- Not an operation inside the eye
Lens replacement
surgery
Lens replacement surgery, or refractive lens exchange (RLE), replaces the clear natural lens with an artificial lens to reduce dependence on glasses. It is the same operation as cataract surgery, chosen electively, so suitability and alternatives are assessed carefully.
Replacing the natural lens. Refractive lens exchange uses an intraocular lens to change the eye’s focus.
Enlarge diagramWhat is refractive lens exchange?
Refractive lens exchange replaces the natural lens of the eye with an artificial lens before a cataract has formed, to change the focus of the eye and reduce dependence on glasses.
The operation is the same as modern cataract surgery: through a very small opening the natural lens is removed and a folded intraocular lens (IOL) is placed in its position. What differs is the reason. In cataract surgery a cloudy lens is removed because it is affecting vision. In RLE a clear lens is removed by choice, which makes the decision an elective one and the suitability conversation more important, not less.
Dr Chen approaches RLE conservatively. It suits some eyes well, but if glasses, contact lenses or laser vision correction are a better choice, Dr Chen will say so.
What should I know about RLE?
- Lens-replacement surgery, the same operation as cataract surgery
- Performed before a cataract, for refractive reasons
- Elective: the eye is otherwise healthy
- The lens design chosen sets what vision to expect
- Not suitable for every eye
How does refractive lens exchange compare with laser eye surgery?
People usually arrive at RLE after weighing glasses, contact lenses and laser vision correction. This is how the three approaches differ.
Refractive lens exchange
- Replaces the clear natural lens with an artificial intraocular lens (IOL)
- Considered for the age-related loss of near focus or for high prescriptions, often once laser has been ruled out
- The same operation as cataract surgery, chosen for a different reason
- Carries the risks of surgery inside the eye, and the lens has to be chosen with care
Cataract surgery
- Replaces a lens that has become cloudy
- The same lens designs and the same trade-offs apply
- Treatment for a condition rather than an elective change
- A cataract will not develop in the artificial lens afterwards
Educational comparison only. Which option, if any, suits an eye is decided at the consultation.
How is suitability for refractive lens exchange assessed?
The assessment looks at the whole eye, because RLE is only sensible when the rest of the eye is healthy and the expectations are realistic.
Measurements of the length and curvature of the eye (biometry) predict the lens power. A map of the cornea shows astigmatism and any irregularity, and whether earlier laser treatment has changed it. The surface of the eye is checked for dryness, which affects both the measurements and the result. An OCT scan (optical coherence tomography) of the macula and a dilated examination of the retina confirm the back of the eye is healthy; this matters particularly in short-sighted eyes, which carry a higher risk of retinal detachment after lens surgery.
Because Dr Chen works across both the lens and the retina, the retinal side of that assessment is part of the same conversation rather than a separate referral.
What do we discuss at the consultation?
- What you want your vision to do: reading, screens, driving, sport
- How you feel about glasses for some tasks
- Your tolerance of haloes or glare at night
- The health of the retina and cornea
- The alternatives, including doing nothing
Which lens is used for refractive lens exchange?
RLE stands or falls on the lens choice, because the lens sets the focus of the eye for good.
Monofocal, toric, extended-depth-of-focus and multifocal designs each place focus at different distances and carry different trade-offs. The comparison, with a diagram of which distances each design typically brings into focus, is on the lens choices page.
Compare intraocular lens designsWhich lens combinations are common?
- One eye set for distance and the other for nearer vision (monovision), usually with monofocal lenses
- Toric versions of any design where astigmatism needs correcting
- Extended-depth or multifocal designs where the eye and the person suit them
Which pairing suits an eye is decided at the consultation; none is promised in advance.
Read the monofocal, EDOF and multifocal guides →
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A general guide to what each design is intended to do, not a prediction for an individual eye. Glasses are often still helpful beyond the shaded range. Reading depends on the lens, the focusing target chosen, lighting and the health of the eye.
What are monovision and blended vision?
Monovision is a way of planning the focus of the two eyes together. It can reduce reliance on glasses, but involves compromises that need to suit you.
One eye for distance, one for nearer tasks
One eye is usually aimed at distance and the other at a closer range. Your brain uses the clearer image for the task. This approach can be used with monofocal lenses during cataract surgery or refractive lens exchange.
What does “blended vision” mean?
The term is used in different ways. With lens surgery, it often describes a smaller difference between the eyes, also called mini-monovision. This may help with computer or arm’s-length tasks while leaving glasses useful for small print.
The trade-offs
The eyes may feel unbalanced, and depth judgement or vision in dim light may be less comfortable. Adaptation varies. Some people prefer matching distance focus in both eyes and reading glasses instead.
Try the idea before committing
A contact-lens trial can help assess tolerance, particularly if you have not used monovision before. It cannot reproduce every aspect of an implanted lens or guarantee the surgical result. Your eye health and daily tasks still guide the recommendation.
Discuss night driving, sport, fine close work and your previous experience with contact lenses. Glasses may still help for demanding tasks, and no focusing plan guarantees complete freedom from them.
What does refractive lens exchange change?
What happens to natural focusing?
Removing the natural lens permanently removes its remaining ability to change focus. An implant can broaden the useful range or be paired with monovision, but it does not restore youthful accommodation. This is an important reason to be cautious in younger eyes.
Is an implant the same as a contact lens?
No. An IOL sits inside the eye and is intended to remain there; it is not removed for cleaning or sleeping. A phakic lens is a different operation: an additional lens is placed inside the eye while the natural lens remains.
What if some prescription remains?
Healing and measurement uncertainty mean the target cannot be guaranteed. Glasses or contact lenses may be the simplest solution. Laser correction or another lens procedure is considered only after assessing the cause, stability and additional risks.
Does the rest of the eye still age?
Yes. Removing the natural lens prevents a cataract forming in that lens, but does not prevent retinal disease, glaucoma or dry eye. The capsule behind the implant can also become cloudy. Continue appropriate eye checks.
Understand the refractive errors you are trying to correct →
What are the risks of refractive lens exchange?
RLE carries the same risks as cataract surgery.
- Surgical risks. Infection, bleeding, swelling of the macula or cornea, raised pressure and, rarely, loss of vision. Retinal detachment is uncommon but more likely in highly short-sighted eyes.
- Glasses may still be needed for some tasks, depending on the lens design and how the eye settles.
- Night-time effects. Haloes or glare around lights with some lens designs, which most people adapt to and some do not.
- Adaptation. Multifocal and extended-depth designs ask the brain to adjust; a few people never feel comfortable with them and, in selected cases, the lens is exchanged.
- Later haze on the capsule behind the lens, cleared with a brief laser treatment.
Who is not suited to refractive lens exchange?
- Eyes with macular disease, an epiretinal membrane or other retinal problems
- Younger eyes that still focus well up close
- Corneal irregularity or significant dryness
- People who want a guarantee of no glasses
What is recovery like after refractive lens exchange?
RLE follows a similar surgical and recovery pathway to cataract surgery. Arrange transport, use your prescribed drops and attend the planned reviews. Early improvement and complete settling are different: vision and comfort may change over the following weeks, and adjustment to a new optical design may take longer.
Discuss work, driving and travel before choosing a date. Seek prompt advice for deterioration, significant pain or new retinal symptoms. A promise of glasses-free vision or a quick return to every activity should not replace an individual plan.
What should I ask Dr Chen about refractive lens exchange?
- Am I a suitable candidate, and what in my eyes makes you say so?
- What are the alternatives for me, including glasses, contact lenses or laser vision correction?
- Which lens design do you recommend for my eyes, and why?
- Will I still need glasses for some tasks?
- What are the risks for my eyes in particular, including to the retina?
- What is realistic for night driving with the lens you recommend?
- What happens if I am not happy with the result?
Common questions about refractive lens exchange
How is RLE different from cataract surgery?
The operation is the same; the difference is the reason. In cataract surgery a cloudy lens is removed. In RLE a clear lens is removed to change the focus of the eye and reduce dependence on glasses.
How is it different from laser vision correction?
Laser reshapes the cornea and leaves the natural lens in place. RLE replaces the lens, so it can address the age-related loss of near focus and higher prescriptions, but it is an operation inside the eye with a different set of risks.
Will I need cataract surgery later?
No. The artificial lens does not develop a cataract. Some people later need a brief laser treatment if the capsule behind the lens becomes hazy.
Is RLE right for a short-sighted eye?
It can be, but highly short-sighted eyes carry a higher risk of retinal detachment after lens surgery, so the retina is examined carefully and the trade-off is discussed openly.
Can both eyes be done together?
Usually one eye at a time, a short interval apart, so the first result can inform the plan for the second.
Can I reverse monovision if I do not like it?
A contact-lens trial can be stopped, but an implanted-lens plan is not as easily reversed. Glasses or contact lenses may help rebalance the focus; another procedure has additional risks and may not be suitable. Discuss the alternatives before committing to surgery.
Where can I read more?
Longer articles by Dr Chen go into these questions in more detail, including what the research shows.
How do I make an appointment with Dr Chen to discuss refractive lens exchange?
Appointments and enquiries are made through Vision Eye Institute Chatswood.
Level 3, 270 Victoria Avenue, Chatswood NSW 2067For referrers
Optometrists, GPs and ophthalmologists can refer through Oculo or with the PDF referral form.
Vision Eye Institute confirms your appointment after you submit your request. The request form is not for emergencies. A referral is not strictly essential to request an appointment, but you need a valid one to claim a Medicare rebate for your consultation.