Light Adjustable Lens: benefits, limitations and how it works

What vision can the Light Adjustable Lens provide?

The original Light Adjustable Lens (LAL) is a monofocal implant whose focusing power can be fine-tuned after cataract surgery. A distance target aims for clear far vision, but reading glasses are usually still needed. The lens does not move or change focus automatically when you look from far to near.

Some patients choose a modest difference between the two eyes, with one aimed further away and the other slightly closer. This is often called mini-monovision or blended vision. It can reduce reliance on glasses, but involves a compromise in how the eyes work together and may not suit driving, fine detail or depth-perception needs.

The newer LAL+ has an additional central optical design intended to extend the range of focus. It is a different model. Neither model guarantees freedom from glasses.

How does light change the lens?

The clear silicone optic contains light-sensitive molecules. A clinic-based Light Delivery Device directs a planned pattern of ultraviolet (UV) light onto it. This triggers polymerisation; remaining mobile molecules redistribute within the optic, altering its shape and focusing power. The surgeon uses measurements of your healed eye to plan the adjustment.

This treats the lens implant itself. It is different from LASIK, which reshapes the cornea, and from YAG posterior capsulotomy, which opens a cloudy capsule. The LAL remains inside the thin capsular bag behind the iris, like other implants used in cataract surgery.

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What happens at the adjustment visits?

The eye must first heal and the prescription become sufficiently stable. Treatment often starts around three weeks after surgery, but dry eye, inflammation or an unstable measurement can delay it.

1. Measure and choose: the team checks the prescription and discusses the vision target.
2. Adjust and reassess: one to three adjustment treatments are typical. You return to assess the effect before deciding whether another adjustment is needed.
3. Lock in: two final light treatments stabilise the lens once the target is accepted. Further routine light adjustment is then finished.

The light exposure is brief, often around 90 seconds, although the appointment includes dilation, examination and preparation. A contact lens is placed on the eye for treatment.

What is the lens made from?

The LAL is a three-piece silicone implant with two thin supporting arms, called haptics, made from PMMA, an acrylic plastic. These hold the optic in the capsular bag. Its surface does not have the series of diffractive rings used by many multifocal lenses.

The enhanced UV-protected platform includes an additional protective layer called ActivShield. It does not remove the requirement for the supplied UV-protective glasses. Available powers and exact model codes must be checked against the Australian product information; overseas catalogues do not establish local stock.

Can it correct astigmatism?

Light adjustment can change both spherical prescription and regular astigmatism. This differs from a conventional toric implant, whose cylinder power is selected before surgery and which must be placed at the planned axis.

Adjustment cannot make every irregular cornea normal. Scarring, keratoconus or irregular changes after earlier surgery can still limit the quality of vision. Read more about toric lens implants and astigmatism.

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Is it available in Australia?

RxSight reported Australian regulatory approval in February 2026. 

As of November 2026, the system is not generally being used in Australia yet.

What are its main advantages?

• Fine-tuning after healing: the prescription can be adjusted using the actual postoperative result, rather than relying only on the preoperative calculation.
• A chance to reassess the target: within treatment limits, patients can discuss a different distance or blended-vision target before lock-in.
• Correction of residual regular astigmatism: the light treatment can address cylinder as well as spherical error.

This may be useful when earlier LASIK or PRK makes lens-power prediction less straightforward. It still requires a healthy enough eye, reliable measurements and a realistic target.

What are the practical limitations?

The principal cost is a longer treatment process. Surgery is followed by several visits, careful UV protection and a period before the final prescription is settled. Patients who travel frequently, live far from the treatment centre or cannot reliably wear the glasses may find this difficult.

There are limits to the amount of adjustment. The lens cannot correct retinal disease, optic-nerve damage or every source of blurred vision. Glasses may still be needed for reading, demanding tasks or residual prescription error. Haloes, glare and reduced night-vision quality can still occur after cataract surgery; absence of diffractive rings is not a promise that these symptoms cannot happen.

After lock-in, later changes in the eye can still alter vision. A cloudy capsule, dry eye or retinal problem needs its own assessment and treatment. General cataract recovery advice remains relevant alongside the additional LAL instructions.

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What can we learn from US experience?

US ophthalmologists have been using the lens since 2017. This video by US ophthalmologist Dr Shannon Wong highlights that earlier experience, including patients referred to him with visual-quality problems after adjustment or lock-in. These referral cases do not show how often such problems occur.

2:11US experience: Shannon Wong, MD

Watch on YouTube →

What does the clinical evidence show?

The original US approval was supported by a randomised multicentre trial comparing the LAL with a fixed monofocal lens. It supports improved refractive accuracy through postoperative adjustment. 

A 2023 retrospective US series studied an enhanced UV-protected LAL in eyes with previous LASIK or PRK. Among 34 eyes in 33 patients aimed at distance, 28 eyes (82.4%) achieved uncorrected distance vision of 20/20 or better, and 33 (97.1%) were within 0.50 dioptres of the intended zero spherical-equivalent prescription. Final assessment averaged about 96 days after lock-in. This was a small series without a fixed-lens control, and included an author with a paid RxSight consultancy.

A 2025 prospective US registry compared 50 bilateral LAL patients with 100 bilateral LAL+ patients. At least two weeks after final lock-in, binocular uncorrected distance vision was 20/20 or better in 46/50 (92%) and 89/100 (89%), respectively. At 40 cm, binocular uncorrected near vision reached 20/20 in 18/50 (36%) and 49/100 (49%). Most patients had blended-vision targets. The groups were not randomised or masked, follow-up was short, and RxSight funded the study; all authors were consultants. 

Who may be a suitable candidate?

Suitability depends on the whole eye and the ability to complete the treatment course. A patient who values precise distance vision, has residual regular astigmatism, or has had previous laser vision correction may have a reason to discuss the system.

US labelling includes restrictions concerning light-sensitising medicines, medicines toxic to the retina, previous ocular herpes, uncontrolled eye movements and inability to comply with treatment or UV protection. Pupil dilation and retinal health also matter. These US requirements should not be substituted for the current Australian instructions for use.

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What are the alternatives?

A conventional monofocal lens can provide good distance vision with a simpler follow-up pathway, although reading glasses are usually required. A toric version can address regular astigmatism. Enhanced monofocal, extended-depth-of-focus and multifocal lenses offer different balances of reading range, contrast and optical symptoms.

The useful comparison is the vision target, the health of your eye and the burden of treatment. See which lens implants are available in Australia and the main lens-choice guide. Depending on the cause of a residual prescription, alternatives after surgery can include glasses, a corneal laser procedure or, less commonly, lens exchange.

What risks should I understand?

The usual risks of cataract surgery still apply, including infection, inflammation, swelling at the macula, retinal detachment and problems with the position or support of the implant. Light adjustment adds its own risks, including unintended changes in lens power after unwanted UV exposure and possible retinal light injury or colour-vision changes.

The FDA assessment recorded uncommon light-related adverse events, including retinal phototoxic injury and persistent changes in colour perception. Temporary pink or reddish vision can also occur after treatment. UV protection and careful treatment planning reduce risk but do not make it zero. If the prescription cannot be corrected satisfactorily, further treatment or lens exchange may be needed.

Individual reports have also described optical distortion or haze within an LAL or LAL+ after adjustment or lock-in, sometimes requiring lens exchange. These reports cannot establish how often this happens. Haze in the implant itself is different from a cloudy capsule behind it; persistent blurred vision needs examination before deciding whether YAG laser or another treatment is appropriate.

What should I ask before choosing it?

• Which exact model is being proposed: LAL or LAL+, and why?
• What distance and reading target suits my daily activities?
• Can my eye dilate adequately, and do any medicines or eye conditions affect eligibility?
• How many visits should I plan for, and what could delay lock-in?
• What is included in the total fee, including adjustments and any additional treatment?
• Who will review me if a problem develops during the adjustment period?
• What glasses am I still likely to need after treatment?

When should I seek urgent advice?

Contact your surgeon urgently if you develop worsening vision, significant eye pain, increasing redness, new flashes or floaters, or a curtain or shadow across your vision. Do not wait for the next adjustment appointment. These symptoms can signal a complication that needs prompt assessment.