Which intraocular lens type has the lowest rate of glare and halos?

Standard monofocal lens Monofocal lenses give sharp vision at one distance with the lowest rate of glare and halos, which is why they remain the standard option.

How do multifocal intraocular lenses provide vision at more than one distance?

They split light between distances Multifocal lenses split light between distances, which can reduce glasses dependence but commonly brings halos and glare at night.

They move forward with ciliary contraction

They correct corneal astigmatism

Which vision ranges does an EDOF intraocular lens typically provide well?

Distance and intermediate EDOF lenses stretch focus across a range, giving good distance and intermediate vision; near may need a little help, and glare is usually less than with multifocals.

Near only, with distance glasses

Near and intermediate, not distance

Distance only, like a monofocal

Above what level of corneal astigmatism do patients benefit from a toric intraocular lens?

More than one diopter Patients with more than one diopter of astigmatism benefit from toric lenses, which need accurate measurements, topography and alignment.

What does an enhanced monofocal intraocular lens offer over a standard monofocal lens?

Slight intermediate gain with low glare Enhanced monofocal lenses extend the intermediate range slightly while keeping glare low, but reading glasses are still needed for fine print.

Full reading range without glasses

Correction of irregular astigmatism

Which eye is a poor candidate for a premium intraocular lens?

An eye with macular disease Eyes with macular disease, corneal irregularity or glaucoma do poorly with premium lenses, and dry eye lowers accuracy and comfort.

An eye with moderate axial myopia

An eye with a dense nuclear cataract

An eye of a keen amateur reader

Before choosing monovision with intraocular lenses, how should the patient's tolerance be tested?

With a contact lens trial Monovision sets one eye for distance and one for near, but not every patient tolerates it, so it is tried with contact lenses first.

With a red-green duochrome test

Which intraocular lens choice is avoided in eyes with previous LASIK or PRK?

Premium multifocal lenses Previous LASIK or PRK makes calculation harder, so several formulas and corneal imaging are used and premium multifocal lenses are avoided.

What do Cochrane reviews show about multifocal compared with monofocal intraocular lenses?

Less spectacle use but more visual phenomena Cochrane reviews show multifocal lenses reduce spectacle use but are linked with more visual phenomena; satisfaction is similar when lenses are well selected.

Equal spectacle use with fewer halos

Higher spectacle use and less glare

No difference in any visual outcome

Why should dry eye be treated before biometry for intraocular lens selection?

A poor surface gives unreliable biometry Dry eye and blepharitis are treated before measuring because a poor surface gives unreliable biometry, which is key for premium lenses.

Dry eye shortens the axial length

Lubricants raise intraocular pressure

It prevents posterior capsule opacification

IOL Selection: Monofocal, Multifocal and EDOF

IOL selection is one of the most personal decisions in cataract surgery.

Each lens type trades distance, near vision and glare differently.

A good choice starts with the patient’s goals and eyes.

Why IOL Selection Matters

The lens stays in the eye for life.

It sets the baseline for vision and glasses use.

A mismatch with expectations causes dissatisfaction even when the surgery is perfect.

Therefore, discuss options before surgery.

Monofocal Lenses in IOL Selection

Monofocal lenses give sharp vision at one distance.

Most patients choose distance and wear reading glasses.

They have the lowest rate of glare and halos.

So they are the standard option.

Test your knowledge 10 questions from this article

Enhanced Monofocal Lenses

Enhanced monofocal lenses extend the intermediate range slightly.

They keep glare low (see enhanced monofocal IOL).

Reading glasses are still needed for fine print.

Also, they suit patients who want a modest range.

Toric Lenses in IOL Selection

Toric lenses correct corneal astigmatism.

Accurate measurements and alignment are essential (see toric IOL misalignment).

Patients with more than one diopter of astigmatism benefit.

Therefore, check topography before choosing.

Multifocal Lenses in IOL Selection

Multifocal lenses split light between distances.

They can reduce dependence on glasses.

However, halos and glare at night are common.

So counsel patients carefully.

EDOF Lenses in IOL Selection

EDOF lenses stretch focus across a range.

They give good distance and intermediate vision.

Near vision may need a little help.

Also, glare is usually less than with multifocal lenses.

Who Is a Poor Candidate for Premium Lenses

Eyes with macular disease, corneal irregularity or glaucoma do poorly.

Dry eye lowers accuracy and comfort.

Patients with high expectations or night driving needs may be unhappy.

Therefore, screen carefully.

Lifestyle Questions

Ask about driving at night, reading and computer use.

Ask about hobbies and occupation.

These details guide the choice.

So take time at the visit.

Monovision in IOL Selection

Monovision sets one eye for distance and one for near.

It reduces the need for glasses.

Not every patient tolerates it.

Therefore, try it with contact lenses first.

Surface Optimization

Treat dry eye and blepharitis before measuring.

A poor surface gives unreliable biometry.

This is key for premium lenses.

Also, repeat the measurements if values disagree.

Expectations and Consent

Explain that no lens is perfect.

Discuss glare, halos and the chance of glasses.

Document the discussion and the decision.

Because satisfaction depends on expectations, be honest.

Clinical image illustrating IOL Selection (figure 2)

Cost

Premium lenses cost more, and insurance rarely covers the difference.

Be transparent about prices.

Do not pressure patients.

Therefore, let them decide calmly.

Evidence

Cochrane reviews show that multifocal lenses reduce spectacle use.

They are linked with more visual phenomena.

Satisfaction is similar between lens types when selected well.

So match the lens to the person.

IOL Selection: Practical Summary

Start with the patient’s goals and the health of the eye.

If the eye is healthy and the expectations are realistic, offer options.

Because glare matters, discuss it openly.

Finally, document your counseling.

Pitfalls to Avoid

Do not promise independence from glasses
Never ignore macular disease
Avoid pressuring patients toward premium lenses
Do not skip the dry eye assessment

IOL Selection and Previous Refractive Surgery

Previous LASIK or PRK makes lens calculation harder.

Use several formulas and corneal imaging.

If the result is uncertain, tell the patient before surgery.

Because accuracy matters, avoid premium multifocal lenses in these eyes.

IOL Selection in Glaucoma

Patients with glaucoma may lose contrast sensitivity.

Multifocal lenses further reduce contrast.

Because the optic nerve is fragile, prefer monofocal or EDOF lenses.

Therefore, discuss this limit openly.

IOL Selection in Dry Eye

Dry eye makes measurements less reliable.

Treat the surface before surgery.

If symptoms persist, avoid lenses that depend on perfect optics.

So choose conservatively.

IOL Selection and Night Driving

Night drivers may dislike halos from diffractive lenses.

Ask about the typical night routine.

Because glare is the most common complaint after multifocal lenses, set clear expectations.

Then decide together.

IOL Selection and Lens Exchange

Lens exchange is possible if the patient is unhappy.

It carries a risk and is not ideal.

Because it is better to choose well at first, take time.

Therefore, document the options discussed.

IOL Selection: Satisfaction Factors

Satisfaction depends on expectations, accuracy and the quality of the ocular surface.

Patients who understand trade-offs are happier.

Because small refractive errors matter, measure carefully.

So invest time before surgery.

For the latest studies, see the PubMed results for IOL selection.

References

de Silva SR, Evans JR, Kirthi V, Ziaei M, Leyland M. Multifocal versus monofocal intraocular lenses after cataract extraction. Cochrane Database Syst Rev. 2016;12:CD003169.
Rampat R, Gatinel D. Multifocal and extended depth-of-focus intraocular lenses in 2020. Ophthalmology. 2021;128:e164-e185.
Miller KM, Oetting TA, Tweeten JP, et al. Cataract in the adult eye preferred practice pattern. Ophthalmology. 2022;129:P1-P126.
Kohnen T, Suryakumar R. Extended depth-of-focus technology in intraocular lenses. J Cataract Refract Surg. 2020;46:298-304.

Test yourself

A few questions straight from this article.

1 / 10 0 correct

Which intraocular lens type has the lowest rate of glare and halos?
Monofocal lenses give sharp vision at one distance with the lowest rate of glare and halos, which is why they remain the standard option.
How do multifocal intraocular lenses provide vision at more than one distance?
Multifocal lenses split light between distances, which can reduce glasses dependence but commonly brings halos and glare at night.
Which vision ranges does an EDOF intraocular lens typically provide well?
EDOF lenses stretch focus across a range, giving good distance and intermediate vision; near may need a little help, and glare is usually less than with multifocals.
Above what level of corneal astigmatism do patients benefit from a toric intraocular lens?
Patients with more than one diopter of astigmatism benefit from toric lenses, which need accurate measurements, topography and alignment.
What does an enhanced monofocal intraocular lens offer over a standard monofocal lens?
Enhanced monofocal lenses extend the intermediate range slightly while keeping glare low, but reading glasses are still needed for fine print.
Which eye is a poor candidate for a premium intraocular lens?
Eyes with macular disease, corneal irregularity or glaucoma do poorly with premium lenses, and dry eye lowers accuracy and comfort.
Before choosing monovision with intraocular lenses, how should the patient's tolerance be tested?
Monovision sets one eye for distance and one for near, but not every patient tolerates it, so it is tried with contact lenses first.
Which intraocular lens choice is avoided in eyes with previous LASIK or PRK?
Previous LASIK or PRK makes calculation harder, so several formulas and corneal imaging are used and premium multifocal lenses are avoided.
What do Cochrane reviews show about multifocal compared with monofocal intraocular lenses?
Cochrane reviews show multifocal lenses reduce spectacle use but are linked with more visual phenomena; satisfaction is similar when lenses are well selected.
Why should dry eye be treated before biometry for intraocular lens selection?
Dry eye and blepharitis are treated before measuring because a poor surface gives unreliable biometry, which is key for premium lenses.

Ahmed Ophthalmologist

Writes and reviews the clinical articles on Educate. Every post is checked against peer-reviewed sources before it goes live.

IOL Selection: Monofocal, Multifocal and EDOF Lenses