Ophthalmic Ultrasound
The eye is only a few centimetres across, and seeing the vitreous, the retina and any lesion inside it takes a dedicated probe. The ophthalmic range puts A-scan and B-scan in one instrument — B-scan shows morphology, A-scan measures length and calculates intraocular lens power, so examination and pre-operative measurement are done on one machine.
Selection guide · how to choose by setting (click to expand)
Clinical departments
Ophthalmology outpatient clinics and wards, pre-operative assessment for cataract and refractive surgery, and ocular trauma in the emergency department.
Examinations supported
- B-scan: examination of the vitreous, retina and other intraocular structures, showing the position and shape of a lesion and its relation to surrounding tissue.
- A-scan and biometry: measurement of anterior chamber depth, lens thickness and axial length, and calculation of intraocular lens power.
- Corneal pachymetry (SPA-100): central and peripheral corneal thickness measurement.
Device types and configurations
| Model | Type | Imaging modes | Display | Notes |
|---|---|---|---|---|
| SAB-200 | Ophthalmic A/B scan | B, A | — | Runs from a computer with the software installed; compact and portable |
| SAB-500 | Ophthalmic A/B scan | B, B+B, B+A, A | 15-inch colour LCD | 10 MHz A-scan probe; built-in battery for 4 hours of operation |
| SAB-600 | Ophthalmic A/B scan | B, B+B, B+A, A | 15-inch colour LCD | Same configuration as the SAB-500 in a different housing |
| SPA-100 | Ophthalmic A-scan / pachymeter | A, P | Large colour LCD | 10 MHz A-scan plus 20 MHz P-scan; 6 IOL formulas |
Key specifications
- B-scan probe: 10 MHz (20 MHz optional), sector scanning, depth 60 mm, gain adjustable from 30 dB to 105 dB
- A-scan probe: 10 MHz, depth 40 mm; measurement range 15 mm to 40 mm, accuracy ±0.05 mm
- Corneal pachymetry (P-scan): 20 MHz probe, resolution 5 μm, measurement range 150 μm to 1500 μm
- B-scan image: 53-degree scan angle, 256 grey levels, axial resolution better than 0.3 mm and lateral resolution better than 0.2 mm
- IOL calculation: 6 formulas available (SRK-II, SRK-T, Binkhorst, Holladay, Hoffer-Q, Haigis)
- Measurement modes: phakic, aphakic and pseudophakic eyes; immersion and contact methods
Where it fits
- Ophthalmology outpatient clinics and wards: routine examination and follow-up of intraocular structures.
- Cataract and refractive surgery centres: pre-operative A-scan measurement and intraocular lens calculation.
- Cornea services: corneal thickness measurement.
How it differs from our other ultrasound ranges
This is the ophthalmic range, supplied with a dedicated ophthalmic probe and IOL calculation software; its applications and configuration differ from the abdominal, cardiac and other general ultrasound ranges. The two are not interchangeable, and selection follows the region to be examined.
Common purchasing questions
Q: Do I have to buy both A-scan and B-scan?
A: It depends on the work. For looking at intraocular structures alone, B-scan is enough; pre-operative measurement for cataract surgery and intraocular lens calculation need A-scan. The SAB series combines both in one instrument.
Q: How accurate is the A-scan measurement?
A: The reference material states a clinical measurement accuracy of ±0.1 mm and an electronic measurement accuracy of 0.0375 mm; the product registration certificate and technical documentation take precedence.
Q: How many probe configurations are there?
A: The A-scan probe can be used handheld, immersed, or mounted on a slit lamp; the B-scan is supplied at 10 MHz with 20 MHz optional.
The information on this page is a technical reference based on product specifications; the applicable scope is that stated in the product registration certificate. Contraindications and precautions are set out in the product manual, and the device must be operated by a licensed physician holding the relevant qualifications. Nothing on this page constitutes a claim of clinical efficacy.
SAB-200 Ophthalmic A/B Scanner
PC-based ophthalmic ultrasound for B-scan imaging and A-scan biometry
View details →
SAB-500 Ophthalmic A/B Scanner
Standalone ophthalmic A/B scanner with a 15-inch screen and built-in battery
View details →
SAB-600 Ophthalmic A/B Scanner
Standalone ophthalmic A/B scanner with a 15-inch screen and custom report templates
View details →
SAP-100 Ophthalmic A-Scan and Pachymeter
A-scan biometry plus corneal pachymetry in one unit
View details →Frequently asked questions
Common questions about products and selection
What do A-scan and B-scan do in ophthalmology?
B-scan examines intraocular structures such as the vitreous and retina and shows the position, shape and surrounding tissue of a lesion; A-scan measures anterior chamber depth, lens thickness and axial length, and is used for intraocular lens power calculation.
Which is needed for pre-cataract measurement?
A-scan with biometry. The SAB series combines A-scan and B-scan in one unit, covering both intraocular examination and pre-operative measurement; the SPA-100 A-scan and pachymeter is available separately.
What probe configurations are available?
B-scan comes with a 10 MHz probe as standard, with 20 MHz optional; the A-scan probe is 10 MHz and can be hand-held, immersion or slit-lamp mounted; corneal pachymetry uses a 20 MHz probe.
How is the intraocular lens power calculated?
Six IOL formulas are built in: SRK-II, SRK-T, Binkhorst, Holladay, Hoffer-Q and Haigis, with measurement modes for phakic, aphakic and pseudophakic eyes. The applicable formula depends on the model and its technical documentation.
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