enVista Envy lens: benefits and trade-offs
The enVista Envy is a multifocal lens implant made by Bausch + Lomb. More specifically, it is a trifocal lens: it is designed to help you see at distance, at computer range and up close after cataract surgery, reducing how often you need glasses.
Its fine focusing rings and pupil-dependent light distribution are designed to balance a broad range of vision with visual quality. As with other multifocal lenses, the main trade-offs are possible haloes, glare and reduced contrast. Understanding the design, the clinical results and your own priorities can help you decide whether it suits you.
How does the enVista Envy lens work?
During cataract surgery, the cloudy natural lens is removed and replaced with a clear artificial lens, called an intraocular lens or IOL. Envy stays inside the eye, behind the iris, which is the coloured part of the eye. It is not a contact lens and does not need daily removal or cleaning.
Envy's front surface has fine concentric rings that divide incoming light between three main focusing ranges. This is called a diffractive design. Its curved surfaces also bend light, and its aspheric shape is designed to control an optical imperfection called spherical aberration, which can affect image sharpness.
“Multifocal” is the broad category; “trifocal” describes the three main focusing ranges. Bausch + Lomb also makes other enVista lenses with different optics. The name enVista Envy is therefore important when comparing implants.
Unlike a young natural lens, Envy does not change shape to focus. Its optical design is fixed. It provides several useful focusing ranges at the same time, rather than restoring the eye's original focusing mechanism.
What distances is it designed to cover?
Envy aims to make a range of everyday tasks easier without changing glasses: seeing across a room, checking a computer screen and reading a phone or book. Intermediate activities such as using a computer are commonly around 60–70 cm away, while a book or phone may be held around 40 cm away. The US clinical study tested intermediate vision at 66 cm and near vision at 40 cm. Those are useful reference distances, rather than a promise that everything at those distances will be perfectly sharp.
Your usual working distance matters. A desktop monitor, laptop and handheld phone may sit at quite different distances. Very close craft work, tiny print or sustained reading may still be more comfortable with glasses and good lighting.
The lens has an intermediate add of +1.6 dioptres and a near add of +3.1 dioptres. These numbers describe additional focusing power at the implanted lens inside the eye. They are not the strengths of reading glasses you should buy, and they are separate from the main lens power calculated for your eye.
A broad range of focus does not mean identical sharpness at every distance. Your preferred reading position and the size and contrast of what you are looking at still matter.
What does the ActivSync design do?
ActivSync is Bausch + Lomb's name for the way Envy distributes light as pupil size changes. Pupils tend to become smaller in bright light and larger in dim light. The optical design uses this change to alter the balance of light directed towards the different focusing ranges.
| Lighting and pupil size | What the design aims to do |
|---|---|
| Brighter light and a smaller pupil | Share light more evenly between distance, intermediate and near focus. |
| Dimmer light and a larger pupil | Direct a greater proportion of light towards distance focus. |
This happens passively: there is no electronic sensor, moving mechanism or battery. The optic includes a 1.2 mm central zone and a diffractive pattern that varies across its surface. “Apodised” is the technical term for this graduated diffractive design.
The change in light distribution with pupil size has been measured in laboratory testing. This explains the optical design, but does not establish that every person will have good night vision or avoid haloes. Pupil size, the eye's optics, retinal health and any remaining prescription all influence what you actually see.
What is the lens made of, and how is it held in place?
Envy is a one-piece lens made of foldable hydrophobic acrylic, a clear plastic used for lens implants. “Hydrophobic” describes the material's interaction with water; it does not mean the lens causes dry eye. The central optic and its two supporting arms, called haptics, are part of the same implant.
The optic is 6 mm across. The overall span, including the arms, is 12.5 mm. The curved arms sit against the inside of the capsular bag—the thin natural envelope left around the lens after cataract removal—to help keep the implant centred and stable.
| Design feature | What it means for you |
|---|---|
| Curved supporting arms with small openings | Help position the lens in the capsule; the openings also allow the surgeon to adjust its orientation during surgery. |
| Foldable material | Allows the lens to pass through a small incision before unfolding inside the eye. |
| UV-absorbing material | Filters ultraviolet light; sunglasses remain useful for comfort and outdoor protection. |
| A square edge around the back of the optic | Intended to limit cells growing behind the lens and reduce later clouding of the capsule. |
TruSight is the name Bausch + Lomb gives to the lens material technology, including resistance to scratches and “glistenings”. Glistenings are tiny fluid-filled spaces within some lens materials, seen by the surgeon under magnification. They are different from the haloes you may notice around lights. A material described as glistening-free does not mean a halo-free visual experience.
StableFlex refers to unfolding and recovery of the lens's shape after insertion. SureEdge refers to the square posterior edge. These features have practical design purposes, but none guarantees perfect vision or prevents every complication. Clouding of the capsule behind the lens, called posterior capsule opacification or PCO, can still occur and may need YAG laser treatment.
What are its dimensions and optical specifications?
Envy is much smaller than it looks in an enlarged product photograph. The 6 mm optic is the part that focuses light; the 12.5 mm overall span includes the supporting arms. Both the standard and toric versions have these dimensions.
| Technical feature | Specification and meaning |
|---|---|
| Lens models | EN is the standard Envy; ETN is Envy Toric, which also corrects regular astigmatism. |
| Optic body diameter | 6.0 mm across the central lens body. |
| Overall diameter | 12.5 mm from one supporting-arm tip to the other. |
| Clear optical diameter | 4.5–5.9 mm, depending on lens power; this describes the clear optical area within the 6 mm body. |
| Central optical zone | 1.2 mm within the larger diffractive optic. |
| Front and back surfaces | An aspheric, apodised diffractive front surface; an aspheric refractive back surface, with toric shaping in Envy Toric. |
| Additional focusing powers | +1.6 D for intermediate and +3.1 D for near, measured at the implanted lens plane. |
| Supporting-arm design | Modified C-loop haptics with small openings for positioning; 0° angulation, meaning no built-in forward or backward angle relative to the optic. |
| Posterior optic edge | A continuous 360° square edge, intended to reduce cell growth behind the implant. |
| Material refractive index | 1.53 at 35°C: a measure of how strongly the material bends light. |
| Ultraviolet filtering | For a +20 D lens, UV transmission is 10% at about 389 nanometres, a wavelength close to the visible-light boundary. |
The aspheric design has a specified −0.15 micrometres of spherical aberration in a standard laboratory model eye, measured with a 5.1 mm aperture at the optic. In practical terms, the shape helps control how light passing through different parts of the lens comes into focus. This is a lens design measurement, not a prediction of your eye's final optical quality: the cornea and the position of the implant also contribute.
How much could it reduce my need for glasses?
The goal is useful vision across a wider range than a standard distance-focused monofocal lens. You may be able to manage many ordinary activities without glasses, while keeping a pair for small print, prolonged reading or demanding work. Good lighting can make near tasks easier.
The usual target is a very small or no remaining distance prescription in each eye, called emmetropia. This lets the trifocal optics provide their intended range. The final result depends on more than the implant. Accurate lens calculations, correction of astigmatism, a healthy cornea and retina, and the way the eye heals all matter. Even a small remaining glasses prescription can affect the sharpness of multifocal vision.
Most of the main Envy study results describe people who had the study lens implanted in both eyes. The eyes work together, so a result after two-eye surgery is not a promise about one eye alone. If the other eye already has a different implant, that combination needs its own discussion.
What do the clinical studies show?
The main US study randomly assigned 501 cataract patients at 23 centres to Envy or an enVista monofocal lens: 332 received Envy and 169 received the monofocal lens. The study included one year of follow-up, with several key results assessed at four to six months. Envy improved intermediate and near vision while maintaining comparable distance vision to the monofocal comparator.
At four to six months after implantation in both eyes, the following results were recorded in bright test conditions. These were measured with any distance prescription corrected, so they should not be read as percentages of people who never needed glasses. The underlying study thresholds allowed up to two missed letters on the stated chart line.
| Clinical study result | How to interpret it |
|---|---|
| About 85% reached the 6/6 distance threshold; 312 assessed | Distance chart vision with the best distance correction. 6/6 is the metric equivalent of 20/20. |
| About 91% reached the 6/7.5 intermediate threshold; 283 assessed | Intermediate chart vision with distance correction in place. |
| About 79% reached the 6/7.5 near threshold; 284 assessed | Near chart vision at 40 cm with distance correction in place. |
A separate Canadian study reported that 93% of 110 patients were completely to moderately satisfied at four to six months after bilateral implantation. This combines several levels of satisfaction; it does not mean 93% were completely satisfied. These results come from manufacturer-held study data.
These findings support the lens's ability to provide a broad visual range in selected patients. They do not predict an individual outcome or establish superiority over every other modern trifocal. The main US trial compared Envy with a monofocal lens, rather than another trifocal. Envy-specific very long-term experience is also less extensive than for older designs.
Will I see haloes or have trouble driving at night?
Haloes are rings around lights; glare can make a bright light seem more intrusive; starbursts look like rays spreading from a light. They can be noticeable around streetlights and headlights after a multifocal implant. Splitting light between focal distances can also reduce contrast, making faint detail harder to pick out in dim conditions.
In the FDA patient information, about 20 in 100 Envy recipients described haloes as quite or very bothersome at four to six months, compared with about 7 in 100 monofocal recipients. Another way of describing the Envy result is that about 80 in 100 had little or no bother from haloes. Little bother does not necessarily mean no haloes were present.
About 6% of Envy recipients in the US study rated their haloes as severe at four to six months. Severity and bothersomeness are different questionnaire measures: the 6% and 20% figures answer different questions and should not be substituted for one another.
Some people become less aware of optical effects over time; others remain troubled by them. If night driving is central to your work or lifestyle, discuss that before choosing a lens. ActivSync's light distribution and the manufacturer's technology intended to reduce light scattering do not eliminate the multifocal trade-off.
Is there a toric version for astigmatism?
Yes. Envy Toric adds correction for regular corneal astigmatism to the trifocal design. Astigmatism means the front surface of the eye focuses light differently in different directions. It can leave vision blurred at several distances unless it is adequately corrected.
The toric version has an additional shaped optical surface and alignment marks. During surgery, the surgeon rotates it to the planned orientation. Stable positioning matters because rotation away from that orientation reduces the amount of astigmatism correction. Planning also accounts for the back surface of the cornea and the effect of the surgical incision; the front-surface measurement alone does not tell the whole story.
The curved haptics press gently against the capsule to help maintain the lens's position. Rotation can still occur. If a toric lens moves enough to affect vision, the surgeon may need to reposition it. Our guide to toric lens implants explains this planning in more detail.
Envy Toric includes a relatively low cylinder option of 0.90 dioptres at the lens plane, approximately 0.63 dioptres at the corneal plane in an average eye. This can be useful when a small amount of regular astigmatism still matters to the intended visual result. Those two numbers describe the same correction at different positions in the eye; they are not interchangeable with a glasses prescription.
What lens powers are available?
The main lens power is selected from measurements of your eye, rather than from your current glasses alone. It is separate from the near add and, for a toric implant, the cylinder power used to correct astigmatism. Dioptres, abbreviated D, are units of optical power.
| Lens specification | Australian power range |
|---|---|
| Envy EN main power | +6 to +10 D in 1 D steps, then +10 to +34 D in 0.5 D steps. |
| Envy Toric ETN main power | +6 to +34 D in 0.5 D steps. |
| Envy Toric cylinder powers | 0.90, 1.25, 1.50, 2.00, 2.50, 3.00, 3.50, 4.25, 5.00 and 5.75 D, measured at the lens plane. |
The toric main powers are expressed as a spherical equivalent: the average focusing power across the two principal directions of the lens. Your surgeon selects both the main power and the astigmatism correction using your eye measurements and the intended focus. The exact model and power for your operation depend on these calculations and local supply.
How is the lens implanted?
Envy is implanted as part of cataract surgery, after the natural lens has been removed. It is folded for delivery through a small incision and then unfolds in the capsular bag. The lens can be delivered with the BLIS insertion system through a recommended incision of 2.2–2.4 mm; the exact approach depends on the surgical plan.
The lens is intended to remain in the eye permanently and does not need routine replacement. Its optical design does not stop later changes elsewhere in the eye, such as macular disease, dry eye or capsule clouding, from affecting vision.
The usual risks of cataract surgery still apply, including infection, inflammation, swelling, retinal complications, a remaining glasses prescription and, occasionally, further surgery. Choosing a trifocal adds decisions about visual effects and glasses dependence to the usual surgical discussion.
Who might be a good candidate?
Envy may suit someone who strongly values reducing glasses use across several distances, has suitable eyes and accepts the possibility of night-time optical symptoms. The decision starts with a careful examination, not simply a preferred lens brand.
Dry eye, an irregular cornea, previous laser vision correction, macular disease or glaucoma affecting the optic nerve can change the balance. Their severity and effect on vision matter. For example, lens choice with macular degeneration needs particular care because the retina already influences contrast and reading vision.
Measurements of eye length and corneal shape help calculate lens power and astigmatism correction. Treating an unstable eye surface may be needed before final measurements. Examination and, where appropriate, a retinal scan help assess whether the eye can make good use of a multifocal implant.
Tell your surgeon which activities matter most: night driving, reading in bed, detailed craft work, sport, or long hours at a screen. Explain how willing you are to use glasses for occasional tasks and how concerned you would be by haloes. These preferences can be as important as the measurements when choosing between suitable lenses.
How does it compare with other lens options?
Different lens implant options prioritise different things. This is a general comparison of categories, not a head-to-head ranking of brands.
| Lens approach | Main balance to consider |
|---|---|
| Monofocal lens, usually focused for distance | Usually fewer lens-related haloes and good optical quality; reading glasses are commonly needed. |
| Extended depth of focus lens | A broader distance-to-intermediate range; reading glasses are more likely than with a trifocal. Optical effects vary with the design. |
| Trifocal lens such as Envy | Greater potential to reduce near-glasses use; haloes, glare and reduced contrast need more consideration. |
You can also read about Tecnis PureSee and Clareon Vivity, two options with a different approach to extending focus. A useful question is: “What would I gain, and what might I notice, compared with a simpler lens in my eyes?”
What if my vision takes time to settle or I am unhappy with it?
Early vision can be affected by healing, dry eye, temporary swelling and the difference between the eyes before the second operation. Learning to use the new range of focus and becoming less aware of optical effects can also take time. Do not assume that every problem is simply adaptation: persistent blur or troublesome symptoms deserve an examination.
Even relatively mild capsule clouding can affect vision with a multifocal lens; reduced contrast sensitivity may make it noticeable sooner. New haze does not necessarily mean the implant itself has deteriorated. The cause guides the response. Options may include treating dry eye, allowing healing, using glasses for a remaining prescription or addressing capsule clouding. In selected cases, a further procedure may be considered. A toric lens may need repositioning; occasionally, a lens exchange is discussed if symptoms remain unacceptable.
If exchange is being considered, discuss it before having YAG laser treatment for capsule clouding, because opening the capsule can make a later exchange more complex. Further surgery has its own risks, so it is worth discussing the plan for an unexpected result before the first operation.
What happened with the 2025 recall?
An Australian recall involving enVista Envy and Envy Toric lenses began on 28 March 2025, following increased reports of toxic anterior segment syndrome, or TASS. This is inflammation caused by a non-infectious reaction inside the eye, usually soon after surgery.
The TGA record lists the recall action as closed out on 16 September 2025. Closing a recall action does not mean a lens has no future risk. If you are considering Envy, your surgeon can discuss the current product information and this history. If you already have an implant, the recall record alone does not mean it should be removed; keep your follow-up appointments and have any symptoms assessed promptly.
What should I ask before deciding?
| Your priority | A useful question for your surgeon |
|---|---|
| Reading and screens | Which tasks am I most likely to manage without glasses at my usual working distances? |
| Night driving | How would you weigh my driving needs against my wish to read without glasses? |
| Eye health | How do my cornea, macula and optic nerve affect the suitability of a trifocal? |
| Astigmatism | Do I need the toric version, and which power is appropriate and available? |
| An unexpected result | What would we check or treat if blur, haloes or a remaining prescription bothered me? |
A good decision is one where you understand both the benefit you are seeking and the trade-offs you are willing to accept. The best fit is individual; the newest design or the longest feature list is not, on its own, a reason to choose a particular lens.
When should I seek urgent help after surgery?
Contact your surgeon or an ophthalmologist urgently if you have worsening or severe pain, increasing redness or a sudden reduction in vision. New flashes, a sudden shower of floaters or a dark curtain across your vision also need urgent assessment. If you cannot reach an eye specialist promptly, attend an emergency department. Do not assume these symptoms are normal adaptation to a multifocal lens.
References and further reading
- US Food and Drug Administration. enVista Envy: summary of safety and effectiveness.
- US Food and Drug Administration. enVista Envy patient information, including the visual-symptom results.
- Shultz and colleagues. Randomised US trial of a full-visual-range lens versus a monofocal lens. American Journal of Ophthalmology, 2025.
- Bausch + Lomb Australia. Patient implant information.
- Therapeutic Goods Administration. Australian enVista recall record.
- European Society of Cataract and Refractive Surgeons. Recommendations for cataract surgery.
- Kaiser and colleagues. Lens exchange with an open posterior capsule, including the implications of previous YAG laser treatment.