How to Pick Your Lens Implant
During cataract surgery, your cloudy natural lens is replaced with a permanent artificial lens — and the lens you choose shapes how you will see for the rest of your life. This guide, written by our surgeons, explains every option honestly: what each lens does brilliantly, and where it compromises.
The Lens Simulator
The same simulator as our Cataract Surgery Guide app. Choose a scene, a lens type, and an astigmatism level — and see an approximation of how the world would look.
These images are approximations to help visualize differences in optical quality between lens types and the effect of uncorrected astigmatism. Individual outcomes vary. Discuss your specific situation with your eye surgeon.
Monofocal Lens
A monofocal lens focuses at one distance only — almost always set for distance. Far vision is excellent: driving, television, recognizing faces across a room. But everything closer than that is out of focus. Objects at computer or dashboard length are blurry, and reading material up close is blurrier still — glasses fill in the gap.
The monofocal is the standard lens typically covered by insurance and Medicare, and it delivers sharp, high-contrast distance vision with the fewest optical side effects.
Extended Depth of Focus (EDOF) Lens
An EDOF lens stretches your range of clear focus. Distance vision stays excellent — and unlike a monofocal, vision at computer and dashboard length is also excellent. Crucially, this added range comes with no additional risk of halos or glare compared to a standard monofocal lens.
The honest trade-off is up close: reading vision is better than a monofocal, but not quite as sharp as a multifocal. Many patients read menus and phones comfortably, while very fine print may still call for light reading glasses.
For many patients, this balance — a wide range of useful vision with monofocal-like optical quality at night — makes the EDOF lens one of the best all-around choices in modern cataract surgery, especially for people who drive at night and live at arm's length: screens, cooking, dashboards, conversation.
Multifocal Lens
A multifocal lens divides incoming light into multiple focal points, giving clear vision at distance, computer or dashboard length, and reading distance — the greatest independence from glasses of any lens type. Approximately 90% of people with a multifocal lens in both eyes do not wear glasses — though this is not a guarantee of freedom from glasses.
The trade-off is shown in the night scene: because the optics split light, there is a possible risk of halos or rings around lights at night. Many patients adapt over weeks to months as the brain learns to filter the halos, but frequent night drivers should weigh this carefully.
The image alternates automatically — or tap it — to compare uncorrected astigmatism with toric correction.
Toric Lens & Limbal Relaxing Incisions
Astigmatism means the cornea is shaped more like a football than a basketball, so light focuses unevenly — and with moderate or significant astigmatism, vision is smeared at every distance, no matter how good the lens is. The comparison shows what that looks like, and what correction restores.
Two tools fix it at the time of cataract surgery: a toric lens, which has the correction built into the implant itself, and limbal relaxing incisions (LRIs) — precise relaxing cuts that gently round the cornea. Toric versions exist for monofocal, EDOF, and multifocal lenses, so correcting astigmatism doesn't limit your other choices.
If you have meaningful astigmatism, correcting it is usually the single highest-impact upgrade available — without it, no lens can deliver its sharpest vision.
The honest comparison.
| Lens | Distance | Computer / Dashboard | Reading | Night Halos |
|---|---|---|---|---|
| Monofocal | Excellent | Blurry | Blurry | Minimal |
| EDOF | Excellent | Excellent | Good | Minimal — like monofocal |
| Multifocal | Excellent | Excellent | Excellent | Possible halos |
| Toric (any type) | Adds astigmatism correction to the lens above — essential if you have meaningful astigmatism | |||
Assumes astigmatism is corrected. Your candidacy for each lens depends on the health of your eyes — macular disease, prior surgery, and other factors can change the recommendation, which is why the final choice is always made together with your surgeon.
The Cataract Surgery Guide App
This simulator — plus everything else you need to know about cataract surgery — lives in our free app, designed by Dr. Shomer.
Your eyes. Your lifestyle. Our guidance.
Dr. Shomer and Dr. Gunzenhauser will measure your eyes, discuss how you live, and recommend the lens that fits — honestly.