A biometry workup is one of the calmest, least invasive parts of preparing for cataract surgery. There are no eye drops that affect your vision for hours afterwards, no contact with the eye, and the entire measurement sequence usually takes between fifteen and twenty minutes.
What Happens, in Order
- You will sit in a comfortable chair facing the first biometer (the Lenstar LS900). Your chin rests on a pad. You look at a small fixation target. The machine acquires its measurements in a few seconds per scan.
- We then repeat the measurement on a second, independent device (the REVO FC OCT). This is the same posture, same fixation, different technology. Each acquisition is brief.
- We then perform corneal topography and anterior segment imaging on the same OCT platform, which gives us a full map of your cornea’s shape, thickness and curvature.
- In selected patients, typically those considering a premium intraocular lens, we also perform a posterior segment OCT to screen the macula before lens surgery is offered.
- All measurements are reviewed by Mr Hove during the consultation. You see the results on the screen. You ask questions. You leave with a written summary.
What You Should Know
The reason for two biometers is not that we doubt the first one. It is that we independently confirm the result. High-quality optical biometers like the Lenstar are reproducible to better than 0.9% for all parameters¹, and modern OCT biometers achieve almost identical reproducibility². When two devices agree, the lens power calculation rests on a verified value rather than an assumed one³.
What You Do Not Need to Worry About
- Biometry is painless. Nothing touches the eye.
- Your vision is not affected during or after the scan.
- You do not need to fast, stop medication, or arrange transport.
- If you wear contact lenses, you may be asked to leave them out for a short period before the appointment so that the corneal shape returns to baseline. We will tell you in advance.
The work that determines whether your surgery is a refractive success is mostly the work that happens before you reach the operating theatre.
Clinical Takeaway
Blue Fin Vision® biometry is brief, painless, and completed entirely within a single consultation visit. The two-device workup is what gives Mr Hove the verified data to plan your surgery confidently.
References
- Cruysberg LPJ, Doors M, Verbakel F, Berendschot TTJM, De Brabander J, Nuijts RMMA. Evaluation of the Lenstar LS 900 non-contact biometer. Br J Ophthalmol. 2010;94(1):106-110. doi:10.1136/bjo.2009.161729
- Jasvinder S, Khang TF, Sarinder KKS, Loo VP, Subrayan V. Agreement analysis of LENSTAR with other techniques of biometry. Eye (Lond). 2011;25(6):717-724. doi:10.1038/eye.2011.28
- Domínguez-Vicent A, Venkataraman AP, Dalin A, Brautaset R, Montés-Micó R. Repeatability of a fully automated swept-source optical coherence tomography biometer and agreement with a low coherence reflectometry biometer. Eye Vis (Lond). 2023;10(1):24. doi:10.1186/s40662-023-00343-4
Related Topics
- Double Biometry for Every Patient
- Why Blue Fin Vision® Performs Double Biometry for Every Cataract Patient
- How a 0.01 mm Difference Can Change Cataract Surgery Outcomes
- Why Most Cataract Clinics Only Use One Biometry Machine, and Why We Don’t
- How Double Biometry Helps Reduce Cataract Surgery Enhancements
- Lenstar vs REVO FC: Why Blue Fin Vision® Uses Both Before Lens Surgery
- What Patients Can Expect During a Blue Fin Vision® Biometry Workup
- Why Trifocal and Toric IOLs Need More Precise Biometry Than Standard Lenses
- Why Topography Quality Matters, and What a TQF Warning Tells Us
