Description
What’s Included
- Haag-Streit BQ 900 LED slit lamp main unit
- Patient table with chinrest and headrest
- Full filter set (cobalt blue, red-free, diffuser, heat-absorbing)
- All standard accessories and power supply
- 90-day Digital Eye Center warranty on parts and workmanship
Condition & Warranty
Used. This Haag-Streit BQ 900 LED slit lamp has been inspected and function-tested across all illumination modes, magnification steps, and beam control functions. LED light source confirmed operational. Cobalt blue, red-free, and diffuse filter operation verified. Covered by a 90-day warranty on parts and workmanship through Digital Eye Center.
Haag-Streit BQ 900 LED Slit Lamp — Used Premium 900-Series Biomicroscope with LED Illumination
The Haag-Streit BQ 900 is the flagship model of the Haag-Streit 900 slit lamp platform — featuring LED illumination, the widest available beam dimensions in the 900 series, and the refined optical system that has made the BQ 900 the preferred instrument in academic ophthalmology centers, subspecialty retinal and corneal programs, and high-volume clinical practices where image quality is non-negotiable. This used Haag-Streit BQ 900 with LED illumination delivers true white balance across the entire examination field, eliminating the progressive color shift of aging halogen illuminators that degrades the reliability of corneal staining assessment, iris color evaluation, and disc color documentation.
The Haag-Streit BQ 900 slit lamp’s cobalt blue filter and LED light source combine to produce the excitation wavelength intensity needed for consistent fluorescein staining documentation and tear film break-up time assessment. Research published in Ocular Surface (National Library of Medicine, 2023) demonstrated the value of standardized fluorescein corneal staining techniques for objectively grading corneal surface disease across dry eye subtypes — directly validating the cobalt blue–enhanced fluorescein biomicroscopy workflow that the Haag-Streit BQ 900‘s LED light source and filter system are designed to support.
Why Practices Choose the Haag-Streit BQ 900
- Flagship 900-series optical system — The BQ 900 represents the highest optical specification in the Haag-Streit 900 family, with wider beam dimensions and finer optical tolerances than the BD and BM models — delivering the beam precision and contrast needed for specular reflection corneal endothelium evaluation and optical section analysis through hazy media.
- LED illumination with consistent spectral output — LED eliminates the progressive color shift and intensity decline of halogen bulbs, ensuring that the cobalt blue excitation, red-free vascular contrast, and white-light color rendering remain consistent across thousands of examination hours without bulb replacement.
- Full slit beam control — 0 to 14 mm width and height — Continuously adjustable slit width and height with 180° rotation provides the beam versatility needed for every examination technique: direct focal illumination, indirect illumination, specular reflection, retro-illumination, sclerotic scatter, and tangential illumination.
- 5-step magnification from 6× to 40× — Wide magnification range supports diffuse anterior segment survey at 6×, routine biomicroscopy at 10×–16×, and high-power endothelial examination at 25×–40× — with smooth magnification steps that do not require refocusing when changing power.
- Compatible with AT 900 Goldmann tonometer — The BQ 900 accepts the AT 900 applanation tonometer as an optional add-on, enabling practices to configure the instrument with or without tonometry depending on examination lane requirements.
- Documentation and photography ready — The BQ 900 platform supports slit lamp camera adapters and beam splitter attachments for anterior segment photography and videography — making it the preferred base instrument for practices adding slit lamp documentation capability.
- Long service life with full parts support — The Haag-Streit 900 platform has been in continuous production since 1959; parts, service manuals, and qualified technicians are available worldwide — making the BQ 900 one of the most supportable ophthalmic instruments available regardless of instrument age.
Clinical Applications
- Corneal disease diagnosis and monitoring — Optical section illumination reveals epithelial, stromal, and endothelial pathology; specular reflection shows endothelial cell density and polymegethism; retro-illumination highlights anterior subcapsular opacities and corneal dystrophy deposits with clarity that lower-quality slit lamp optics cannot match.
- Dry eye and ocular surface assessment — Cobalt blue illumination with fluorescein sodium visualizes corneal staining patterns, meibomian gland dysfunction evaluation, and tear film break-up time across the full exposure zone — the foundation of every dry eye work-up and treatment monitoring protocol.
- Anterior segment examination — Standard slit lamp biomicroscopy of the eyelids, conjunctiva, cornea, anterior chamber, iris, and crystalline lens forms the basis of every comprehensive ophthalmic examination — including nuclear sclerosis grading, angle estimation, and anterior vitreous assessment.
- Contact lens fitting and management — White-light biomicroscopy for lens centration, fluorescein pattern assessment for RGP and scleral lens fit, and corneal staining grading for contact lens–related complications require the optical quality and beam precision that the BQ 900 provides.
- Posterior segment with auxiliary lenses — Combined with a non-contact fundus lens (78D, 90D) or contact lens, the BQ 900 enables indirect slit lamp biomicroscopy of the optic disc, macula, and peripheral retina — providing posterior segment access in every exam lane.
- Anterior segment documentation — With a camera adapter or beam splitter, the BQ 900 provides the base for slit lamp photography of corneal pathology, anterior chamber findings, and iris abnormalities for medical record documentation, patient education, and publication.
Who This Is For
- Corneal and external disease specialists — the BQ 900’s optical precision, LED cobalt blue filter, and documentation compatibility make it the instrument of choice for subspecialty corneal examination and disease management that demands the highest slit lamp image quality.
- Dry eye and ocular surface practices — high-volume dry eye clinics performing repeated fluorescein staining documentation benefit from the LED’s consistent spectral output and long bulb life compared to halogen systems that require frequent bulb changes in a busy examination schedule.
- Comprehensive ophthalmology and optometry practices equipping an additional exam lane with the same reference-standard optical quality as their primary instrument — the BQ 900 eliminates the optical quality variation between lanes that lower-tier instruments introduce.
- Practices adding slit lamp documentation — the BQ 900’s camera-adapter compatibility makes it the logical base instrument for practices planning to add anterior segment photography without purchasing a separate photo slit lamp.
- Residency and fellowship training programs — training on the Haag-Streit BQ 900 platform ensures that trainees develop slit lamp technique on the same instrument they will use throughout their careers, as the 900-series is the reference standard in virtually every academic ophthalmology training program.
Technical Specifications
| Specification | Detail |
| Model | Haag-Streit BQ 900 (premium 900-series) |
| Illumination | LED |
| Magnification | 6×, 10×, 16×, 25×, 40× (5-step) |
| Slit Width | 0 – 14 mm (continuously adjustable) |
| Slit Height | 0 – 14 mm (continuously adjustable) |
| Slit Rotation | 180° |
| Filter Set | Cobalt blue, red-free, diffuser, heat-absorbing |
| Tonometer | Not included (AT 900 compatible — optional) |
| Camera Port | Compatible with slit lamp camera adapters |
| Working Distance | 100 mm |
| Manufacturer | Haag-Streit AG, Switzerland |
| Condition | Used |
| Warranty | 90 days |
Compare Haag-Streit 900 Slit Lamp Options
| Feature | Haag-Streit BQ 900 LED | BQ 900 + AT 900 Tonometer | Haag Streit BM 900 |
| Series | BQ 900 (premium) | BQ 900 (premium) | BM 900 (mid-range) |
| Illumination | LED | LED | LED / Halogen |
| AT 900 Tonometer | Not included (optional) | Included | Included |
| Condition | Used | Used | Used |
| Price | $12,000 | $9,900 | $8,580 |
Questions about the Haag-Streit BQ 900? Contact us for availability and shipping details.
