AI biometry for cataract surgery uses high-resolution swept-source optical scans of your eye, analysed by artificial-intelligence intraocular lens (IOL) formulas, to calculate the exact lens power needed for your target vision. By combining precise optical measurements with AI prediction models trained on large surgical datasets, it improves the chance that you land on your refractive target first time — reducing the need for glasses and the risk of a surprise result. At our partner clinics, AI-assisted biometry and lens planning are included in every cataract surgery assessment at no extra charge.
What is biometry and IOL calculation?
During cataract surgery your eye’s clouded natural lens is removed and replaced with a clear artificial intraocular lens. That replacement lens has to be the right strength — just like spectacles, but permanently inside the eye. Biometry is the set of precise measurements (the length of the eye, the curvature of the cornea, the depth of the anterior chamber and more) that feed an IOL power formula. The formula then predicts which lens power will give you your desired vision, whether that is sharp distance vision or a fuller range with a premium lens.
Older formulas relied on a handful of measurements and theoretical optics. Modern AI-assisted formulas are trained on tens of thousands of real surgical outcomes, learning subtle patterns — particularly in unusual eyes — that traditional equations miss. The result is tighter refractive accuracy across the whole range of eye shapes, including very long, very short and previously laser-treated eyes.
Where accuracy matters most
- Long and short eyes — high myopes and hyperopes where classical formulas drift
- Post-laser eyes — patients who have had LASIK, PRK or SMILE, where corneal measurements are altered
- Astigmatism — precise corneal mapping for toric IOL alignment
- Premium lenses — EDOF and multifocal lenses demand a bullseye refractive result to perform
- Refractive lens exchange — precision is even more critical in RLE where there is no cataract driving the decision
Planning premium-lens cataract surgery? AI biometry gives your surgeon the accuracy that premium lenses need to deliver their full benefit.
Book a cataract assessmentWhy AI-assisted lens calculation?
No single formula is perfect for every eye. Our approach cross-checks several modern methods and applies AI prediction to converge on the most reliable lens power for your individual eye.
AI does not replace your surgeon — it informs them. Every calculated result is reviewed by your consultant, who matches the lens power and lens type to your eye anatomy and your goals. The full range of implant lens options is available, and your plan covers both eyes together where you are having bilateral surgery, including same-session ISBCS.
What happens during your biometry scan
Biometry is quick, painless and completely non-invasive. It is done at your assessment visit, before any decision about surgery is finalised.
- You rest your chin on a support and look at a target light — nothing touches your eye.
- The swept-source OCT scanner captures the length of your eye, corneal curvature, chamber depth and lens position in seconds.
- The measurements are run through multiple AI and modern optical formulas to calculate candidate lens powers.
- Your consultant reviews and cross-checks the results, discussing your target vision and any astigmatism correction.
- A final lens plan — power, type and, for toric lenses, axis — is agreed with you.
After your scan
There is no recovery from biometry itself — it is just a scan. What follows is your personalised surgical plan. Our consultation guide explains the whole visit, and the patient journey page walks through every step from assessment to aftercare.
At your assessment
Biometry scan and full eye examination. No drops needed for the scan itself, though your pupils may be dilated for other checks.
Same visit
Your consultant reviews the AI-calculated lens options with you and answers your questions about target vision.
Before surgery
Your final lens power, type and axis are confirmed. Measurements may be repeated if anything has changed.
On the day
Your planned lens is implanted. Premium and toric lenses are positioned to the calculated specification.
At review
Your achieved result is checked against the target — the accuracy of the original biometry is reflected in your vision.
Cost
AI-assisted biometry and IOL planning are included in your cataract package at our partner clinics — there is no separate charge for the technology. You pay only for your chosen procedure and lens.
- Cataract surgery: from £2,900 per eye (monofocal), with premium lenses priced on the cataract price list. AI biometry is part of every package.
- Insurance: recognised by Bupa, AXA, Aviva, Vitality, Cigna, WPA and others — see insured patients.
- Finance: 0% options available — see our finance page.