Multifocal and trifocal lens implants

Multifocal lens implants provide more than one focusing distance. Trifocal designs aim to cover distance, intermediate and near tasks, reducing the need to reach for glasses throughout the day.

Main strength

Useful vision at several distances, including closer tasks.

Glasses

Less dependence is the aim; complete independence is not assured.

Trade-off

Haloes, glare and reduced contrast must be weighed against the wider range.

Explore a multifocal lens in 3D

The central optic is the clear part of the lens. The curved arms, called haptics, help support it inside the eye.

Compare lens designs and optional features. Surface details and tint are enhanced for illustration; actual lenses vary.

An illustrative multifocal intraocular lens with concentric optical rings, curved supporting arms, yellow tint and toric axis marks

Compare lens types, rotate and explore optional features.

How do multifocal and trifocal lenses work?

These implants distribute incoming light between different focuses. A trifocal design provides distance, intermediate and near focuses; other multifocal designs use a different arrangement. Your visual system learns to use the image most helpful for the task.

The exact reading and screen distances vary between models and patients. Holding a phone slightly farther away or using better lighting may help, but glasses may still improve demanding tasks.

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Schematic distribution of light with distance from the eye. A monofocal concentrates light at one distance, a trifocal divides it between three, and an extended depth of focus lens keeps it together but spreads it along the range. Heights and widths are illustrative and are not measured values. Some light is lost or scattered in any lens.

Do multifocal lenses cause glare or haloes?

Dividing light brings a compromise. Compared with monofocal lenses, multifocal designs can make haloes or rings around lights more noticeable and reduce contrast, particularly in dim conditions. This matters if you drive frequently at night or depend on very fine visual detail.

Adaptation can take time, and some people remain troubled by optical effects. A lens should be selected with this possibility in mind. If symptoms persist, the eye needs checking for other causes such as dry eye, a remaining prescription or capsule clouding before treatment is considered.

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Illustrations of the kind of effect each design can produce, drawn for teaching. They are not photographs, not measurements of any particular lens, and not a prediction of what you will see. Most people notice far less than this, and many stop noticing it over months. Moving the slider shows why haloes are more obvious in the dark: the pupil is wider, so more of the lens is being used.

Who is suited to a multifocal lens?

The health of the eye

A regular cornea and healthy macula help make the most of a multifocal image. Macular disease, significant glaucoma, corneal irregularity or previous surgery can change the recommendation.

Your priorities

These lenses may appeal if reducing glasses for near tasks is a high priority and you accept the optical compromises. Someone who prioritises night vision may prefer a different approach.

Dr Chen uses multifocal lenses where the examination and discussion support that choice. A toric version can also address regular corneal astigmatism when appropriate. No single design is right for every eye.

What should I ask before choosing a multifocal lens?

Ask what vision you can reasonably expect for your usual reading distance, screen and night driving. Discuss the plan for both eyes, the chance of still needing glasses and what would happen if the result did not meet your expectations.

An artificial lens is intended to remain in the eye. Exchanging it later is a further operation with additional risks. In particular, discuss dissatisfaction with the implant before having YAG treatment to the capsule behind it, because an open capsule can complicate exchange.

Understanding vision after cataract surgery and IOL exchange →

Common questions about multifocal lenses

Is a trifocal lens a type of multifocal lens?

Yes. “Multifocal” is the broader term. A trifocal lens is designed to provide three principal focusing ranges: distance, intermediate and near.

Will haloes always disappear as I adjust?

No. They may become less noticeable, but some people continue to see them. Discuss your tolerance of night-time effects before choosing the lens and report persistent troublesome symptoms afterwards.