Intraocular Lens Types Compared: Monofocal, Monofocal Plus, EDOF and Trifocal

Four main intraocular lens (IOL) types are used in cataract surgery: monofocal, monofocal plus, EDOF and trifocal. In short, monofocal suits patients wanting the sharpest distance vision alone; monofocal plus or EDOF suits balanced distance and intermediate vision; trifocal suits reducing glasses dependence, including for near tasks. Suitability depends on your eye anatomy and examination findings; this page is only a general guide.

It sets all four types side by side. For one type's full details, see its own page; deciding only between monofocal and trifocal, see the dedicated comparison.

A monofocal lens gives clear vision at one focal distance, usually distance, and is the longest-established IOL type; reading glasses are usually still needed for near tasks. Cataract surgery is covered on a separate page.

Of the four types, monofocal has the most predictable outcome and widest track record — usually the first option when eye anatomy does not suit a multifocal lens.

Monofocal plus, EDOF and trifocal lenses are grouped as "premium" IOLs, each adding vision at more than one distance (intermediate and/or near) beyond standard monofocal. They differ in distance range covered and possible optical side effects.

All three need eye anatomy suited to a multifocal lens; irregular astigmatism or certain retinal conditions can limit these options, so examination findings decide suitability.

The core difference is how many distances the lens can focus: monofocal targets one distance (usually far); monofocal plus adds limited intermediate reach; EDOF gives a wide, continuous band from distance to intermediate; trifocal aims to focus near, intermediate and distance at once.

As the distance range widens, some patients notice more night haloes and glare.

Patients driving at night for long periods, wanting the lowest halo/glare risk, more often consider monofocal or monofocal plus. Those at a screen for long hours, wanting distance-intermediate balance, may look at EDOF or monofocal plus.

For heavy near-vision demands — reading, close handwork — wanting to stay glasses-free, trifocal can stand out. These are general tendencies only; recommendation depends on examination.

The table summarises the four lens types against the same criteria.

Monofocal may be preferred for patients whose eye anatomy limits multifocal lens use — irregular astigmatism or advanced retinal disease, for example — or for those who simply prioritise the sharpest distance vision above all else.

It is also frequently chosen by patients who drive at night often and want the lowest possible optical side-effect risk, given its predictable outcome.

Premium lenses (monofocal plus, EDOF, trifocal) are considered when eye anatomy is suitable and the patient wants less dependence on glasses across more than one distance. Which premium type is chosen depends on priorities and examination findings.

With monofocal and monofocal plus lenses, little learning is expected from the brain; vision generally stabilises within a few weeks. EDOF's adaptation stays short, since light concentrates into one continuous zone.

With trifocal, the brain must learn to select between three focal points (neuroadaptation), so adjustment can take from the first weeks to a few months, varying by patient.

Monofocal lenses generally give the highest contrast and lowest risk of night haloes and glare. Monofocal plus and EDOF stay close to standard monofocal but carry slightly higher optical side-effect risk.

With trifocal, night haloes and glare are often more noticeable than the other three types — a difference that matters especially for frequent night drivers.

Op. Dr. Anıl Kaya weighs corneal structure, intraocular measurements, any coexisting eye conditions and the patient's lifestyle priorities together when choosing a lens. No single type is right for every patient; the decision becomes clear only after an individual examination.

Premium lenses (monofocal plus, EDOF, trifocal) are sometimes assumed interchangeable; in reality each works on a different optical principle with its own distance-range and side-effect balance.

Another misconception is that the newest or most advanced-sounding lens will automatically suit every patient; suitability depends on eye anatomy, and none of the four types is automatically right for everyone.

Working out which IOL type suits you needs a detailed decision guide and an eye examination; a separate page explains the factors behind lens selection. The most-asked monofocal-versus-trifocal comparison is covered on its own page too.

For a personalised IOL assessment, book an appointment with Op. Dr. Anıl Kaya in Istanbul via the contact page.