EVO Viva : Reversible, Minimal, Modern.
EVO Viva and refractive lens exchange (RLE) can both reduce or even remove the need for glasses in short‑sighted adults who are also struggling with reading vision, but they work in very different ways and suit different patients.
Who this article is for
If you are short‑sighted (myopic) and noticing that reading up close is becoming harder, you may have heard of surgical options to correct both problems at once. As we age, the eye’s natural lens loses focusing power — a normal process called presbyopia — and glasses for distance and for reading can become inconvenient, especially for people with active lifestyles or visually demanding work.
At Sandhurst Eye Centre, we offer two main lens‑based approaches for this situation: EVO Viva, a modern phakic implantable lens, and refractive lens exchange (RLE), which replaces your natural lens with an artificial intraocular lens.
This article explains how they differ, who they tend to suit, and why retinal safety is a central part of the decision.
Understanding myopia and presbyopia
Myopia means you see better up close than far away without glasses, because the eye is focusing light in front of the retina.
Presbyopia is the age‑related loss of near focusing ability, usually starting in the 40s, as the natural lens becomes stiffer and less able to change shape.
Many adults have both conditions: they are dependent on glasses for distance and also need reading glasses or multifocals.
Lens‑based surgery aims to reshape how light is focused in the eye so that distance and near vision can be improved, often reducing reliance on spectacles or contact lenses.
What is EVO Viva?
EVO Viva is a type of phakic intraocular lens (ICL) designed to treat myopia and presbyopia while preserving your own natural lens.
In this procedure, a small, flexible lens is placed behind the coloured part of the eye (iris) and in front of the natural lens, in a space called the posterior chamber.
Because the natural lens remains in place, EVO Viva is considered additive and reversible: if needed, the implant can be removed or exchanged in the future.
In a recent study of patients aged 45–55, EVO Viva provided very good uncorrected vision at distance, intermediate, and near, with binocular distance vision typically 20/25 or better across a useful range of focus.
Not everyone is a candidate for EVO Viva.
The front of the eye needs enough depth and volume, the drainage angles must be open, and conditions like advanced glaucoma or significant corneal disease may mean a phakic implant is not advisable.
Careful measurements of corneal thickness, anterior chamber depth, endothelial cell count, and angle anatomy are part of the pre‑operative work‑up.
What is refractive lens exchange?
Refractive lens exchange (RLE) is essentially cataract‑style surgery performed earlier in life for refractive reasons.
In this procedure, your natural lens is removed and replaced with an artificial intraocular lens (IOL) chosen to correct your distance prescription and presbyopia.
Modern RLE uses advanced lens designs such as multifocal, trifocal or extended‑depth‑of‑focus IOLs to provide a broad range of vision from near to far. Because there is no remaining natural accommodation, the IOL’s optical design is responsible for your near vision, and RLE can offer the widest possible range of vision when optimisation is successful.
Unlike EVO Viva, RLE is not reversible in the sense of restoring your original natural lens: once the crystalline lens is removed, it cannot be put back. On the other hand, this means that you have effectively had your cataract surgery “early”, and you should not need cataract surgery again later in life for that eye.
Feature | EVO Viva (phakic ICL) | Refractive Lens Exchange |
What happens | A small implant lens is placed behind the iris and in front of your own lens, leaving the natural lens untouched. | Your natural lens is removed and replaced with an artificial intraocular lens, similar to modern cataract surgery. |
Natural lens | Stays in place and continues to function, including any remaining accommodation. | Permanently removed; all focusing is done by the implanted IOL. |
Reversibility | The implant can be removed or exchanged if necessary, preserving the option to consider other techniques later. | Not reversible with respect to the natural lens; while IOLs can sometimes be exchanged, the lens extraction itself is permanent. |
Typical age range | Commonly offered from the 20s up to about 60, particularly in younger presbyopes who still value preserving the natural lens. | Usually mid‑40s onward, when presbyopia is more established and lens change is expected in the natural course of ageing. |
Best suited for | Myopia within the approved range (approximately −0.5 to −20.0 D) with adequate anterior chamber depth and early presbyopia, especially if reversibility is important. | More advanced presbyopia, complex prescriptions (including hyperopia and significant astigmatism), or cases outside phakic lens ranges or anatomy. pubmed.ncbi.nlm.nih+1 |
Recovery | Clear vision often within a day or two, with many patients returning quickly to normal activities. | Recovery similar to cataract surgery; distance vision is often clear within days, with near performance stabilising over weeks. |
Future cataracts | You may still develop cataracts later; cataract surgery would then be done with the implant in place or adjusted as needed. | Cataracts are effectively dealt with at the time of RLE, so you usually will not need cataract surgery again in that eye. |
Retinal detachment risk: the key safety difference
For myopic eyes, especially those with longer axial lengths, retinal detachment is one of the most serious potential complications to consider. High myopia stretches and thins the retina and increases the likelihood of peripheral retinal changes; surgical interventions inside the eye can add to that risk.
Published data and recent reviews consistently show that RLE in myopic patients carries a higher lifetime risk of retinal detachment than standard cataract surgery in non‑myopic eyes, particularly in younger patients with long axial lengths.
A narrative review and several cohort studies have highlighted age under 60 years and axial length over about 23–26 mm as important risk factors.
Phakic IOLs like EVO Viva do not remove the natural lens and generally involve less disturbance of the vitreous body, and comparative series in highly myopic patients aged 30–50 have reported retinal detachments in the lens‑extraction group but not in the phakic IOL group over several years of follow‑up. This is one reason why many surgeons favour phakic IOLs over early RLE in younger high myopes without existing cataract.
It is important to emphasise that your baseline myopia‑related risk never completely disappears, whichever procedure you choose. Lifelong regular dilated retinal checks remain recommended, and any new flashes, floaters or a curtain‑like shadow in the vision should be examined urgently.
Other risks to consider
All eye surgery carries some risk, and part of your consultation is to understand these in the context of your own eyes.
For refractive lens exchange, typical concerns include:
Posterior capsule opacification (PCO) — a clouding of the thin membrane behind the IOL that can reduce vision but is usually easily treated with a short laser procedure (YAG capsulotomy).
Capsule rupture or zonular instability during surgery, which can increase the risk of other complications; large series report rates of capsular complications in a few percent of cases, depending on lens status and surgeon.
Cystoid macular oedema (CME), a swelling of the central retina, which is uncommon but can occur after lens surgery in a small proportion of eyes and is usually treatable.
For EVO Viva and other phakic IOLs, risks include:
Endothelial cell loss or corneal health issues over time if the lens is poorly sized or positioned too close to the cornea, which is why careful measurements and follow‑up are essential.
Raised eye pressure, inflammation or need for repositioning/exchange of the implant, all of which are uncommon but recognised in the post‑operative period.
Unsuitable anatomy, for example a front chamber that is too shallow, narrow drainage angles, or coexisting glaucoma, which can make phakic IOLs poor candidates and push the choice more toward RLE or other approaches.
Your surgeon will discuss these risks in the context of your prescription, axial length, corneal and anterior segment anatomy, and retinal status.
How well do the procedures work?
Published outcomes for both procedures are generally excellent when patients are carefully selected and surgery is performed with modern techniques.
For EVO Viva, clinical data in presbyopic myopes aged roughly 45–55 show:
High levels of uncorrected distance and near vision, with binocular distance acuity frequently 20/25 or better across a range of focus from slight plus to moderate minus vergences.
A significant reduction in presbyopic add power after surgery, indicating improved functional near vision without full‑strength reading glasses. For RLE with modern multifocal or extended‑depth‑of‑focus IOLs, large presbyopic series report:
The majority of patients achieving 20/20 or better distance vision in both eyes and becoming largely independent of glasses for most day‑to‑day tasks.
A meaningful proportion experiencing optical side effects such as halos, glare or reduced contrast sensitivity under some conditions, which need to be weighed against the benefit of broad spectacle independence.
No procedure can guarantee complete freedom from glasses in every situation. Some patients may still prefer thin spectacles for specific tasks, such as prolonged near work, driving at night, or very fine detail.
Which option may suit you better?
Although the decision is always individual, the following broad patterns often apply:
You may be better suited to EVO Viva if:
You are in your 30s, 40s or early 50s and still have some useful natural accommodation that you would prefer to preserve for now.
Your myopia is within the approved range for phakic IOLs and your anterior segment anatomy meets safety criteria.
You value the concept of a reversible procedure and may wish to keep the option of future lens‑based solutions open.
You may be better suited to refractive lens exchange if:
You are in your mid‑40s or older and your presbyopia is well established, with the natural lens already providing little accommodation.
Your prescription (short‑ or long‑sighted, with or without astigmatism) falls outside typical phakic lens ranges, or your eye anatomy is not suitable for a phakic IOL.
You would also like to eliminate the future need for cataract surgery, addressing presbyopia and lens clarity at the same time.
In younger high‑myopic patients, many surgeons now prefer phakic IOLs over early lens extraction due to the balance of visual benefit and retinal safety, whereas in older presbyopes with modest myopia or hyperopia, RLE may be the more natural choice.
Questions to ask your surgeon
Before deciding, it can be helpful to ask your surgeon:
Which of these two procedures fits my specific prescription and eye measurements? This includes corneal shape, anterior chamber depth, endothelial cell count and axial length.
What is my personal risk of retinal detachment, based on my degree of myopia and the length of my eye? Understanding your individual baseline risk helps frame the pros and cons of RLE versus a phakic IOL.
If I choose EVO Viva now, could I still consider refractive lens exchange later in life? Many patients start with a phakic IOL and convert to lens exchange when a cataract develops or presbyopia progresses.
What does recovery look like for me specifically, and when can I safely return to driving, work and sport? Timelines can vary slightly with your occupation, eye healing response, and the type of lens implanted.
What is the realistic chance that I will still need glasses for some tasks afterwards? This includes night driving, fine near work and digital device use.
Final note
This article is a general educational guide and does not replace a detailed, in‑person consultation.
At Sandhurst Eye Centre, your surgeon will assess your individual prescription, eye measurements, retinal health and lifestyle needs before recommending whether EVO Viva, refractive lens exchange, or another option is most appropriate for you.
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