Corneal Topographers
A corneal topographer is a foundational diagnostic instrument for any practice that fits contact lenses, screens for keratoconus and other ectatic disease, evaluates irregular astigmatism, or plans cataract and refractive surgery. Most systems work on the Placido-disc principle: concentric illuminated rings are projected onto the tear film, and the reflected pattern is analyzed to reconstruct the shape and curvature of the anterior cornea. The software renders that data as color-coded maps — steeper zones in warm colors, flatter zones in cool colors — so you can see surface irregularities at a glance and track how they change over time.
At US Ophthalmic we bring together corneal topographers across a range of budgets and workflows, from our own Ezer Onyx to the Huvitz HTG-1 family and Tomey diagnostic platforms. Every system is backed by our in-house technical and repair department, genuine spare parts, and a US warranty, so your capital diagnostic stays supported long after the sale. Our team helps you match the right topographer to your patient volume and clinical focus — request a quote and we will walk you through the options.
How to choose a corneal topographer
- Measurement scope: Placido-disc topographers characterize the anterior corneal surface — curvature, astigmatism and keratoconus screening — which covers the needs of most contact lens and general practices. If you also need posterior-surface elevation and full-thickness pachymetry, that is the domain of Scheimpflug tomography, a distinct and typically higher-cost class of instrument.
- Ring coverage and resolution: The number of Placido rings (or mires) and the corneal area sampled affect how much of the cornea, including the periphery, you capture and how finely surface detail is resolved. Some platforms offer a choice here — the Tomey TMS-4N, for example, is available in 25-ring or 31-ring cone configurations.
- Analysis maps and screening software: Look at the map set and indices included: axial, tangential, refractive, Gaussian and elevation maps, Fourier or Zernike analysis, dedicated keratoconus screening, and differential or comparison maps that quantify change between visits. Progression tracking is essential for monitoring keratoconus and post-surgical corneas.
- Stand-alone versus multifunction: Decide whether you want a dedicated topographer (Huvitz HTG-1, Ezer Onyx, Tomey TMS-4N) or an all-in-one unit that consolidates several exams. The Tomey MR-6000 folds refraction, keratometry, topography, tonometry, pachymetry and dry eye analysis into a single automated instrument, which can save bench space and streamline high-volume workflows.
- Dry eye and specialty-lens tools: If tear-film and meibomian gland assessment matter in your clinic, choose a model with dry eye analysis or meibography — such as the Huvitz HTG-1 D, Ezer Onyx or Tomey MR-6000. For GP, scleral and ortho-k fitters, contact lens fitting simulation is a valuable add-on to have on the same platform.
- Service, warranty and support: A topographer is a long-term capital investment, so factor in who stands behind it. As a US provider with an in-house repair department, genuine spare parts and US warranty coverage, we keep your instrument calibrated and serviceable rather than leaving you to source support overseas.
Featured corneal topographers
These are the corneal topographer platforms we carry, spanning dedicated Placido-disc units, our Ezer house-brand system, and a full multifunction diagnostic. Model availability and configuration vary — contact us for current pricing and lead times.
| Model | Type | Best for |
|---|---|---|
| HTG-1 | Huvitz Placido-disc topographer | Practices wanting dependable stand-alone corneal mapping for contact lens fitting and surgical planning |
| HTG-1 D | Huvitz topographer with dry eye analysis | Clinics that also want tear-film and dry eye assessment built into one platform |
| Onyx | Ezer full-featured topographer (house brand) | Comprehensive mapping with meibography, contact lens fit simulation and visit-to-visit progression tracking |
| MR-6000 | Tomey 6-in-1 multifunction unit | High-volume offices consolidating refraction, keratometry, tonometry, pachymetry, topography and dry eye |
| TMS-4N | Tomey Placido-disc topographer (25 or 31 rings) | Detailed keratoconus screening and specialty or GP lens work |
Frequently asked questions
What is the difference between a corneal topographer and a corneal tomographer? A topographer maps the shape and curvature of the anterior corneal surface, typically using Placido-disc reflection, which is ideal for contact lens fitting, astigmatism evaluation and keratoconus screening. A tomographer — usually Scheimpflug-based — reconstructs the cornea in three dimensions, adding posterior-surface elevation and pachymetry data. Tomography provides a more complete picture but is a costlier, separate class of device; most practices are well served by a quality Placido topographer.
Which topographer is best for keratoconus screening? Any model with dedicated keratoconus indices and differential or comparison maps is well suited, because tracking change over time is central to detecting and monitoring ectasia. All of the systems we carry offer keratoconus analysis; the Ezer Onyx and Tomey TMS-4N are particularly strong for detailed screening and progression tracking. Our team can help you compare the map sets on each.
Can a corneal topographer help with contact lens fitting? Yes. Precise curvature and eccentricity data make topography valuable for fitting soft, GP, scleral and ortho-k lenses, and several models include contact lens fitting simulation so you can model a lens on the measured cornea before ordering. The Ezer Onyx is a good example of a platform with fitting-simulation tools built in.
What is dry eye or meibography analysis, and which models include it? Beyond corneal mapping, some topographers add tear-film and meibomian gland imaging to help evaluate dry eye disease — assessing tear meniscus, break-up and gland structure. In our lineup, the Huvitz HTG-1 D, Ezer Onyx and Tomey MR-6000 offer dry eye or meibography capabilities, letting you combine surface mapping and ocular-surface assessment on one instrument.
Do you sell new or refurbished topographers, and how are they supported? The topographers featured here are offered as new systems. Because we are a US provider rather than a reseller, every instrument is backed by our in-house technical and repair department, genuine spare parts and US warranty coverage — so calibration, service and support are handled here. Request a quote and we will confirm current availability, configuration and pricing for your practice.
