If you want the best all-around value in a dedicated A-scan ultrasound biometer for 2026, the Ezer EUS-1800 A is our top recommendation. It delivers the fast, repeatable axial-length readings and IOL power calculation that cataract pre-op demands, in a portable touchscreen unit that is fully warrantied and serviced in the United States, at a fraction of the cost of a premium optical biometer. For most clinics building or refreshing their cataract workup, it hits the accuracy-to-value sweet spot that matters most in day-to-day practice.
That said, biometry is not one-size-fits-all. Buyers today weigh two distinct technologies: ultrasound (A-scan) biometry, which touches or immerses a probe against the eye and remains the reliable fallback for dense, mature, and posterior-subcapsular cataracts that optical light cannot penetrate; and optical biometry (swept-source OCT or partial coherence), which is non-contact, fast, and highly reproducible but can fail on very dense media. The best practices keep an ultrasound biometer on hand no matter what else they own.
This guide compares seven of the models U.S. ophthalmologists and optometrists actually shop for, spanning both technologies. We rank the Ezer EUS-1800 A first on genuine value, then compare it fairly against the Zeiss IOLMaster 700, Nidek AL-Scan, Sonomed Escalon PacScan Plus, Quantel Compact Touch, and two additional Ezer configurations, so you can match the right instrument to your surgical volume, patient mix, and budget.
Shopping for ultrasounds? US Ophthalmic is a direct provider of ultrasounds to eye care practices across the US. Tell us how your lane is set up and we will come back with the configurations that fit, plus current availability and lead times.
How to Choose an Ophthalmic Ultrasound Biometer
- Measurement method: Decide between contact (applanation) A-scan, immersion A-scan, and non-contact optical biometry. Contact is fast and simple but can compress the cornea and shorten axial length if technique is imperfect; immersion removes that variable; optical is non-contact but needs clear media. Many practices keep an ultrasound unit specifically as the backup for eyes optical cannot read.
- Accuracy and repeatability: Axial length is the single largest source of IOL power error, so look for automatic capture, multi-reading averaging, and a displayed standard deviation across scans. Repeatable, gate-verified echoes with a clean retinal spike matter more than any single fast reading.
- Dense-cataract penetration: This is ultrasound's decisive advantage. When a mature white or dense brunescent cataract blocks the optical signal, a 10 MHz A-scan probe still returns a usable axial length. Any clinic doing cataract surgery needs this capability somewhere in the building.
- IOL formula suite: Confirm the device carries the formulas you use, including modern and post-refractive options (for example Haigis, Hoffer Q, Holladay, SRK/T, and post-LASIK/PRK methods). Onboard calculation with lens-constant storage saves time and reduces transcription error.
- Added modalities: Consider whether you also need pachymetry (LASIK co-management, keratoconus screening, glaucoma) or B-scan posterior imaging (dense cataracts, vitreous hemorrhage, tumors, trauma). Combination A/P and A/B/P platforms consolidate several instruments into one footprint.
- Portability and workflow: A compact unit with a color touchscreen, footswitch capture, onboard memory, and USB or network export moves easily between lanes and satellite offices and keeps techs efficient.
- Service, warranty, and parts: Downtime is lost surgical planning. Prioritize a provider with a genuine U.S. warranty, in-house repair, and stocked spare parts and probes, rather than an overseas RMA that idles the device for weeks.
- Total cost of ownership: Look past the sticker to probe replacement cost, calibration, software updates, and support. A well-supported value biometer often delivers a far better return than a premium optical unit whose price the busiest surgical centers can justify but the average clinic cannot.
#1 · Ezer EUS-1800 A (Ezer)
Best overall value: a fast, accurate, U.S.-warrantied A-scan biometer that covers the cataract pre-op essentials without the premium-optical price.
The Ezer EUS-1800 A is a high-end yet cost-effective ultrasonic A-scan biometer built around exactly what cataract pre-op requires: quick, repeatable axial-length readings and dependable IOL power calculation. Its 10 MHz A-scan probe takes multiple readings and averages them, helping you select the appropriate intraocular lens power with confidence, while the color touch LCD screen and portable, sleek chassis keep the workflow simple enough for any technician to master. Because it is ultrasound, it does the one thing optical biometers cannot: return a usable axial length through dense, mature, and posterior-subcapsular cataracts that block optical light, which is precisely why leading clinics keep an A-scan on hand regardless of what else they own. What separates the EUS-1800 A from imported bargain units is the ownership experience. As an Ezer product sold through usophthalmic, it ships with a full U.S. warranty and is backed by an in-house technical, repair, and spare-parts department, so a probe issue or calibration need is handled domestically instead of a weeks-long overseas RMA. For the majority of practices, that combination of genuine accuracy, everyday usability, and dependable stateside support makes it the smartest first biometer to buy.
Pros: Excellent accuracy-to-value ratio for a dedicated A-scan biometer · 10 MHz probe with multi-reading averaging for repeatable axial length · Reads through dense and mature cataracts optical biometry cannot penetrate · Portable design with an intuitive color touch LCD · Full U.S. warranty plus in-house repair, service, and spare parts
Considerations: Contact ultrasound requires good technique to avoid corneal compression · Dedicated biometer: no onboard pachymetry or B-scan (see the AP and 2600 configurations)
Best for: Cataract-focused practices wanting an accurate, well-supported dedicated A-scan biometer at the best value.
#2 · Zeiss IOLMaster 700 (Zeiss)
The premium optical benchmark: swept-source OCT biometry with class-leading reproducibility for high-volume surgical centers that can justify the investment.
The Zeiss IOLMaster 700 is the reference standard many surgeons measure everything else against, and for good reason. It was the first swept-source OCT biometer, generating a full-length cornea-to-retina cross-section that lets clinicians visualize the fovea and detect unusual ocular geometry such as crystalline lens tilt or decentration, findings that can quietly undermine refractive outcomes if missed. It derives axial length, central corneal thickness, anterior chamber depth, and lens thickness in one non-contact capture, and its Total Keratometry feature accounts for the posterior corneal surface, a meaningful advantage for toric and premium-IOL planning. Reported cataract penetration exceeds 99 percent, which is exceptional for an optical device. The trade-offs are cost and category. This is a premium instrument priced for high-volume cataract and refractive centers, and like all optical biometers it can still be defeated by the densest media, where an A-scan remains the fallback. usophthalmic does not sell the IOLMaster 700; we include it as the fair optical benchmark. If your surgical volume and case mix justify the investment, it is outstanding, but many practices get the accuracy they actually need from a well-supported ultrasound biometer at a fraction of the outlay.
Pros: First-in-class swept-source OCT biometry with a full-length ocular scan · Total Keratometry captures the posterior cornea for toric/premium IOLs · Reported cataract penetration above 99 percent for an optical device · Detects lens tilt and decentration that can affect outcomes · Non-contact, highly reproducible, fast in trained hands
Considerations: Premium price aimed at high-volume centers · Optical signal can still be blocked by the densest cataracts · Larger, table-mounted footprint; not a portable unit · Not sold or serviced through usophthalmic
Best for: High-volume cataract and premium/toric IOL surgical centers that need best-in-class optical reproducibility.
#3 · Nidek AL-Scan (Nidek)
A fast optical biometer with a built-in ultrasound safety net: captures the core cataract metrics in seconds, with an optional contact A-scan for eyes optical cannot read.
The Nidek AL-Scan is a well-regarded optical biometer that appeals to clinics wanting speed and breadth in a single non-contact capture. It measures six fundamental cataract values, axial length, corneal curvature, anterior chamber depth, central corneal thickness, white-to-white distance, and pupil size, in about ten seconds, aided by 3-D auto-tracking and auto-shot that reduce operator variability. Its most practical feature for a mixed patient population is the optional A-scan ultrasound probe: when the optical measurement fails on a dense cataract, the tech can switch to contact ultrasound on the same device rather than reaching for a second instrument, with an axial-length range spanning roughly 12 to 40 mm. That hybrid approach makes it a sensible bridge between pure optical and pure ultrasound workflows. usophthalmic does not carry the AL-Scan; we include it as a recognized comparison point. It is a strong choice for practices ready to invest in optical biometry, though it sits well above a dedicated ultrasound unit in price, and clinics that primarily need a reliable, well-supported A-scan will find better value in the Ezer EUS-1800 A.
Pros: Captures six key cataract metrics in about ten seconds · 3-D auto-tracking and auto-shot minimize operator error · Optional onboard A-scan ultrasound probe as a dense-cataract fallback · Non-contact primary workflow is comfortable for patients · Established, widely recognized brand in cataract clinics
Considerations: Priced well above a dedicated ultrasound biometer · Full ultrasound capability depends on the optional probe · Table-mounted rather than truly portable · Not sold or serviced through usophthalmic
Best for: Clinics wanting fast multi-metric optical biometry with an integrated ultrasound fallback for dense eyes.
#4 · Ezer EUS-1800 AP (Ezer)
Two instruments in one: the EUS-1800 A biometer plus onboard corneal pachymetry, ideal for practices doing cataract, refractive, and glaucoma work.
The Ezer EUS-1800 AP takes everything that makes the EUS-1800 A a strong value biometer and adds a dedicated pachymeter, combining two indispensable tools in one compact, portable unit. On the biometry side it performs the same fast, multi-reading A-scan axial-length measurement and IOL power calculation for cataract planning. On the pachymetry side it delivers precise central corneal thickness readings, exactly what you need when co-managing LASIK, screening for keratoconus, planning limbal relaxing incisions, or refining risk assessment for glaucoma patients whose true IOP interpretation depends on corneal thickness. Consolidating both functions into a single touchscreen device saves bench space and capital versus buying separate instruments, and it keeps a technician on one familiar interface. Like every Ezer unit sold through usophthalmic, it carries a full U.S. warranty and is backed by in-house repair, service, and spare parts, so uptime is protected domestically. For a growing practice that wants biometry now and knows pachymetry is coming, the EUS-1800 AP is the efficient, future-proofed choice, adding a whole clinical modality for far less than a second standalone device would cost.
Pros: Combines A-scan biometry and corneal pachymetry in one device · Supports LASIK co-management, keratoconus screening, LRI, and glaucoma workups · Portable touchscreen platform with a familiar single interface · More cost-effective than buying separate biometer and pachymeter · Full U.S. warranty with in-house Ezer service and parts
Considerations: No B-scan posterior imaging (step up to the EUS-2600 for that) · Contact ultrasound technique still affects biometry accuracy
Best for: Multi-service practices that need A-scan biometry and corneal pachymetry in a single portable unit.
#5 · Ezer EUS-2600 (Ezer)
An affordable A/B combination platform: A-scan biometry plus diagnostic B-scan imaging for dense cataracts, vitreous, and posterior-segment evaluation.
The Ezer EUS-2600 is a portable ultrasonic A/B scanner that brings A-scan biometry and B-scan posterior imaging together on one easy-to-use platform, a natural step up for practices that need to see behind an opaque media as well as measure it. It ships with a 10 MHz A-scan probe and a 10 MHz B-scan probe, with an optional 20 MHz B-scan probe for higher-resolution anterior work, and supports capture by touchscreen, mouse, keyboard, or footswitch so the operator can work hands-free at the slit lamp. Clinically, that means one instrument for cataract biometry and for evaluating vitreous hemorrhage, retinal detachment, posterior staphyloma, and intraocular masses, cases where a mature cataract blocks the ophthalmoscopic view entirely. Patient records save, print, or transfer easily over USB. Sold through usophthalmic as an Ezer product, it includes a full U.S. warranty plus in-house repair, service, and stocked probes and parts, protecting your investment against downtime. For a clinic that wants both biometry and diagnostic imaging without buying two separate machines or paying premium-brand pricing, the EUS-2600 is a versatile, budget-conscious workhorse.
Pros: Combined A-scan biometry and B-scan diagnostic imaging · Ships with 10 MHz A and B probes; optional 20 MHz B probe · Hands-free capture via footswitch, touchscreen, mouse, or keyboard · Ideal for imaging behind dense cataracts and posterior pathology · Full U.S. warranty with in-house Ezer service and parts
Considerations: Broader platform is more than clinics needing biometry alone require · 20 MHz high-resolution B-probe is an optional add-on
Best for: Practices needing both cataract biometry and B-scan posterior imaging in one affordable platform.
#6 · Sonomed Escalon PacScan Plus (Sonomed Escalon)
A well-established U.S.-made combination A-scan and pachymeter with immersion or contact modes and a broad IOL formula suite.
The Sonomed Escalon PacScan Plus is a familiar name in American ophthalmic ultrasound, a portable, digital combination A-scan biometer and pachymeter with a large color touchscreen and a reputation for repeatable measurements. Its flexibility is a genuine strength: it supports both immersion and direct-contact A-scan with manual or automatic capture, plus dedicated modes for cataract, dense cataract, aphakic, silicone oil, and pseudophakic eyes, so it adapts to unusual media without workarounds. It auto-calculates axial length, anterior chamber depth, lens thickness, and vitreous, and reports the average and standard deviation across up to five scans per exam so you can judge measurement quality at a glance. The onboard IOL suite is deep, including Holladay, Hoffer Q, Haigis, and regression formulas alongside post-refractive options. The pachymeter builds each reading from many individual measurements for alignment confidence. usophthalmic does not sell the PacScan Plus; we include it as a fair, recognized comparison. It is a solid, proven instrument, though pricing and service run through Sonomed's own channels; practices weighing it against the Ezer EUS-1800 AP should compare total cost and the convenience of usophthalmic's in-house U.S. support.
Pros: Established U.S. brand with a long ophthalmic ultrasound track record · Both immersion and contact A-scan with mode presets for tricky eyes · Averaged readings with standard deviation for quality control · Deep onboard IOL formula suite including post-refractive options · Integrated pachymetry with multi-sample per-reading averaging
Considerations: Sales and service run through Sonomed's channels, not usophthalmic · B-scan requires a separate device in the product line · Positioned above a value biometer on price
Best for: Practices that specifically want a proven U.S.-brand immersion-capable A-scan and pachymeter combination.
#7 · Quantel Medical Compact Touch (Quantel Medical (Lumibird))
A modular, ultra-compact A/B/P platform that scales from biometry to high-resolution B-scan and pachymetry as your imaging needs grow.
The Quantel Medical Compact Touch, now part of Lumibird Medical, is an ultra-compact modular ultrasound platform that combines A-scan biometry, B-scan imaging, and optional pachymetry in one touchscreen unit with no external PC to haul between lanes. Its signature A-scan feature is the patented Probeam technology, which projects a laser fixation beam to help align the probe on the visual axis, and its 15 MHz B-scan delivers crisp posterior-segment images for vitreoretinal disease, intraocular tumors, and dense cataracts. Pachymetry is quoted to roughly five-micron accuracy with multiple corneal-map modes, and the onboard IOL calculator carries a dozen formulas including post-refractive methods, letting you compare lens options side by side. Connectivity is modern, with DICOM, EMR, and Wi-Fi export built in, and the modular design means a practice can buy the modes it needs today and add others later. usophthalmic does not carry the Compact Touch; we include it as a respected comparison. It is a capable multi-modality instrument, but its premium modular pricing means clinics that mainly need dependable biometry, with or without pachymetry or B-scan, often get comparable clinical value from the Ezer EUS-1800 A, AP, or EUS-2600 with U.S.-based support.
Pros: Modular A/B/P platform in an ultra-compact, PC-free unit · Patented Probeam A-scan with laser fixation for axis alignment · High-resolution 15 MHz B-scan for posterior-segment imaging · Twelve IOL formulas including post-refractive options · Modern DICOM, EMR, and Wi-Fi connectivity
Considerations: Premium modular pricing versus a dedicated value biometer · Full multi-modality capability requires buying additional modules · Sales and service run through Quantel/Lumibird channels, not usophthalmic
Best for: Practices wanting a single modular platform that scales across biometry, B-scan, and pachymetry.
Feature comparison
| Model | Technology | A-Scan Biometry | Pachymetry | B-Scan Imaging | Best For |
|---|---|---|---|---|---|
| Ezer EUS-1800 A | Ultrasound (10 MHz) | Yes (contact) | No | No | Best-value dedicated biometer |
| Zeiss IOLMaster 700 | Swept-source OCT (optical) | Optical, non-contact | Yes (CCT) | OCT cross-section | High-volume premium surgical centers |
| Nidek AL-Scan | Optical + optional US probe | Optical + ultrasound backup | Yes (CCT) | No | Fast optical workup with US fallback |
| Ezer EUS-1800 AP | Ultrasound (10 MHz) | Yes (contact) | Yes | No | Biometry + pachymetry in one unit |
| Ezer EUS-2600 | Ultrasound A/B (10/20 MHz) | Yes (contact) | Optional | Yes (B-scan) | Biometry + posterior imaging |
| Sonomed Escalon PacScan Plus | Ultrasound | Yes (immersion/contact) | Yes | Separate model | Proven U.S. A-scan + pachymeter |
| Quantel Compact Touch | Ultrasound (modular A/B/P) | Yes (Probeam) | Yes | Yes (15 MHz) | Modular multi-modality platform |
Why it’s our top pick
The smart-value case for the Ezer EUS-1800 A comes down to matching real clinical need with total cost of ownership. Cataract pre-op fundamentally requires an accurate, repeatable axial length and a sound IOL power calculation, and the EUS-1800 A delivers exactly that with a 10 MHz probe, multi-reading averaging, and an intuitive color touchscreen. It also does the one thing premium optical biometers cannot: measure through the dense and mature cataracts that block optical light, which is why an ultrasound biometer belongs in every cataract practice regardless of what else is on the bench. Where Ezer truly separates from imported bargain units and premium foreign brands alike is ownership: every unit sold through usophthalmic carries a genuine U.S. warranty and is backed by an in-house technical, repair, and spare-parts department, so a probe or calibration issue is resolved domestically instead of an idle weeks-long overseas RMA. And because the same family scales to the EUS-1800 AP (adds pachymetry) and the EUS-2600 (adds B-scan), a practice can start with the biometer it needs today and grow on one familiar, supported platform, without paying premium-optical prices for accuracy the average clinic can achieve with well-executed ultrasound. That is best value defined not by lowest sticker, but by dependable performance plus stateside support.
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Frequently asked questions
Optical vs. ultrasound biometry: which is better for IOL calculation? They are complementary. Optical biometers (like the Zeiss IOLMaster 700 or Nidek AL-Scan) are non-contact, fast, and highly reproducible, but they can fail on very dense or mature cataracts because the media blocks light. Ultrasound A-scan biometers (like the Ezer EUS-1800 A) touch or immerse a probe and reliably return an axial length through those dense eyes. Most surgical practices keep an ultrasound biometer on hand as the essential fallback no matter what optical device they own.
If I already have an optical biometer, do I still need an A-scan? Yes. Optical biometry cannot penetrate the densest cataracts, silicone-oil-filled eyes, or eyes with significant media opacity. In those cases an A-scan ultrasound biometer is the only way to obtain an axial length for IOL power calculation. A dependable, affordable unit like the Ezer EUS-1800 A is inexpensive insurance against turning away or rescheduling those patients.
What is the difference between contact and immersion A-scan? In contact (applanation) A-scan the probe gently touches the cornea, which is fast but can slightly compress the eye and shorten the measured axial length if technique is imperfect. Immersion A-scan places a fluid coupling between probe and cornea to eliminate that compression, often improving accuracy. Some instruments support both; good technique and multi-reading averaging with a low standard deviation are what ultimately drive a reliable result.
Which IOL formulas should an ultrasound biometer support? Look for modern and post-refractive options such as Haigis, Hoffer Q, Holladay, and SRK/T, plus dedicated methods for post-LASIK/PRK eyes. Onboard calculation with stored lens constants reduces transcription error and speeds the pre-op workflow. The Ezer biometers, Sonomed PacScan Plus, and Quantel Compact Touch all carry deep onboard formula suites.
Is the Ezer EUS-1800 A available and serviced in the United States? Yes. It is sold through usophthalmic with a full U.S. warranty and is backed by an in-house technical, repair, and spare-parts department. That means calibration, probe replacement, and service are handled domestically, avoiding the multi-week overseas RMA delays common with grey-market or imported instruments. Pricing is quote-based, so request a quote for current configurations.
Can one device handle biometry, pachymetry, and B-scan? It can, if you choose the right platform. The Ezer EUS-1800 AP combines A-scan biometry with corneal pachymetry, and the Ezer EUS-2600 combines A-scan biometry with B-scan posterior imaging (with an optional high-resolution 20 MHz probe). Modular units like the Quantel Compact Touch can also scale across all three. Match the modalities to your case mix so you are not paying for capabilities you will not use.
The verdict
For most U.S. practices, the Ezer EUS-1800 A is the best-value ophthalmic ultrasound biometer of 2026: accurate, portable, easy for any technician to run, and, crucially, backed by a full U.S. warranty with in-house repair and spare parts. It covers the cataract pre-op essentials and reads through the dense cataracts that defeat optical biometry, making it a sound core instrument for any clinic. If you also need corneal pachymetry, step up to the Ezer EUS-1800 AP; if you need diagnostic posterior imaging alongside biometry, the Ezer EUS-2600 A/B platform is the versatile pick, both on the same supported family. The premium optical alternatives are excellent in their lane: the Zeiss IOLMaster 700 is the gold-standard swept-source biometer for high-volume surgical centers, and the Nidek AL-Scan offers fast optical capture with an ultrasound fallback, but both carry premium pricing that the average practice does not need to spend to get reliable results. The Sonomed Escalon PacScan Plus and Quantel Compact Touch are proven ultrasound instruments worth considering, though both run sales and service through their own channels. Weigh your surgical volume, patient mix, and the value of dependable domestic support, and for the great majority of clinics the answer points to Ezer.
