Manufacturer Directory · Diagnostics
Imaging and Biometry the measurement layer behind surgical referrals.
Optical biometers, OCT and widefield imaging decide lens power, document disease and support co-management. Many optometric practices own some of this equipment already, which makes their measurements part of the surgical conversation.
Quick answer
Good biometry starts with a good surface.
Optical biometers measure axial length, keratometry and anterior chamber depth for IOL calculations. Their keratometry depends on a stable tear film; eyes with hyperosmolar tears showed more variable readings in a multicenter study. Treating the ocular surface first protects the lens calculation.
Key takeaways
- Swept-source OCT biometry: IOLMaster 700 (ZEISS).
- Low-coherence reflectometry: Lenstar LS900 (Haag-Streit).
- Scheimpflug plus biometry: Pentacam AXL (OCULUS).
- Other biometers include Topcon Aladdin and Nidek AL-Scan.
- Repeat keratometry after treating dry eye.
Optical biometers.
Technologies as described in a 2017 Review of Ophthalmology comparison.
| Device | Company | Technology |
|---|---|---|
| IOLMaster 700 | ZEISS | Swept-source OCT |
| Lenstar LS900 | Haag-Streit | Optical low-coherence reflectometry |
| Aladdin | Topcon | Low-coherence interferometry |
| AL-Scan | Nidek | Optical biometry with optional ultrasound A-scan |
| Pentacam AXL | OCULUS | Scheimpflug imaging with biometry |
Imaging platforms commonly seen in referrals.
Device names as listed by their manufacturers.
| Device | Company | Use |
|---|---|---|
| SPECTRALIS | Heidelberg Engineering | OCT imaging platform |
| CIRRUS 6000 | ZEISS | OCT |
| Maestro2 | Topcon | OCT with fundus photography |
| optomap devices | Optos | Ultra-widefield retinal imaging |
| Keratograph 5M | OCULUS | Topography and dry eye imaging |
Related pages.
Dry eye diagnostics and retinal imaging have their own guides.
References
- Review of Ophthalmology. Sizing up optical biometers, April 2017. Review of Ophthalmology
- Epitropoulos AT, et al. Tear osmolarity and keratometry repeatability. J Cataract Refract Surg. 2015;41(8):1672-1677. PubMed
- Heidelberg Engineering. SPECTRALIS. Heidelberg
- ZEISS. CIRRUS 6000 specifications. ZEISS
- Every source behind this guide is listed on the Vision Rescue sources page. All sources
About this guide
Written for licensed eye care practices by the Vision Rescue team from manufacturer, FDA, CMS and peer-reviewed sources. Questions: providers@visionrescue.com or 1-855-692-8024.
Important notes and disclosures
Information only; listings are not endorsements, and Vision Rescue is not a distributor of capital surgical equipment. Confirm U.S. availability, indications and specifications with each manufacturer. Vision Rescue is a licensed pharmaceutical wholesale distributor.
Measure on a healthy surface.
Treat dry eye, then repeat keratometry before the lens is chosen.
All product names are trademarks of their respective owners.