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Ultrasound Biomicroscopy

Eye Care estimated about CNY 500-900

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Description

A high-frequency ultrasound imaging technique used to visualize anterior segment structures of the eye, such as the ciliary body, iris, and angle, with resolution up to 50 micrometers.

Main Uses

UBM is primarily used for high-resolution, non-invasive imaging of the anterior segment structures not visible by standard slit-lamp biomicroscopy or gonioscopy. Key clinical applications include: diagnosing angle-closure glaucoma mechanisms (e.g., plateau iris, ciliary body rotation), evaluating ciliary body tumors (e.g., melanoma, adenoma), assessing traumatic anterior segment injuries (e.g., cyclodialysis cleft, iridodialysis), monitoring post-surgical anatomy (e.g., tube shunt placement, IOL positioning), and investigating uveitic complications (e.g., ciliary body edema, exudative detachment).

Normal Range

UBM is an imaging modality, not a quantitative assay; thus, it does not yield numerical 'values' with standard reference ranges. Instead, normal findings include: anterior chamber depth ≥2.0 mm, angle recess visible without synechiae, ciliary body contour smooth and symmetric, iris root insertion at scleral spur, no abnormal masses or cysts, and clear visualization of the trabecular meshwork and posterior chamber structures. Measurements (e.g., ciliary body thickness, iridocorneal angle width) are context-dependent and reported in millimeters or degrees but lack universal population-based norms due to device variability, operator dependence, and anatomical diversity.

Low Values - Possible Causes

UBM does not produce 'low values' in the biochemical sense; however, reduced image quality or diminished structural visibility (e.g., poor angle definition, obscured ciliary body) may result from: 1) Corneal edema or opacities, 2) Severe conjunctival chemosis or blepharospasm, 3) Inadequate coupling gel or probe misalignment, 4) Patient noncompliance or inability to maintain gaze position, 5) Technical limitations in high-frequency transducers (e.g., limited penetration in dense tissues).

High Values - Possible Causes

UBM does not generate 'high values' as a lab test; apparent 'abnormal elevation' refers to pathological structural findings visualized on imaging, including: 1) Anterior chamber shallowing (e.g., <1.8 mm depth) indicating angle-closure risk, 2) Ciliary body cysts or tumors causing localized mass effect, 3) Iris bombe or plateau iris configuration increasing angle crowding, 4) Peripheral anterior synechiae (PAS) extending >90°, 5) Ciliary body detachment or effusion causing abnormal contour widening.

ultrasound biomicroscopy anterior segment imaging glaucoma diagnosis tool

estimated about CNY 500-900