Figure Angle recession: Angle recession can be noted as widening of the angle from sclera spur posteriorly left arrow Click here to view. Figure Cyclodialysis cleft: Cleft is noted as a communication between the anterior chamber and supraclliary space up arrow Click here to view. Figure Zonular stretching: Zonular stretching is noted at thin echogenic lines stretched between the lens and ciliary processes Click here to view.
A MHz B-scan ultrasound backscatter microscope.
[Full text] Ultrasound biomicroscopy as a diagnostic tool in infants with primary | OPTH
Ultrason Imaging ; Utrasound biomicroscopy of anterior segment structures in normal and glaucomatous eyes. Am J Ophthalmol Ultrasound biomicroscopy of Anterior segment tumours. Ophthalmology Ultrasound biomicroscopy in the assessment of anterior scleral diseases. Am J Ophthalmol ; Ultrasound biomicroscopy in Scleritis. Ophthalmology ; Ultrasound biomicroscopy in glaucoma. Surv Ophthalmol ; Angle imaging: Advances and challenges. Indian J Ophthalmol ;59 Suppl:S Changes in the anterior chamber depth and angle width after filtration sugery: A quantitative study using ultrasound biomicroscopy.
J Glaucoma ; High-frequency ultrasound measurements of the normal ciliary body and iris.
Ophthalmic Surg Lasers Imaging ; Silverman RH. High-resolution ultrasound imaging of the eye - a review. Clin Experiment Ophthalmol ;37; This article has been cited by. Search Pubmed for Bhatt DC. Figure 9: Large irido-ciliary cyst causing anterior bowing of the peripheral iris. Figure Large thin-walled, irido-ciliary, echolucent cysts may cause displacement of the IOL and subsequent reduction in visual activity. UBM is the gold standard when evaluating and following up irido-ciliary cysts.
These are visualised as thin walled echolucent lesions Figure 9. Figure 10 shows large irido-ciliary cysts causing IOL displacement. Figure 11 shows a non-axial UBM exploring a lesion that was initially referred as a melanoma. This was a pseudophakic eye with a lens remnant.
A clear demarcation can be seen between the lens fragment and the iris, as apposed to melanomas, which are more homogenous as in Figure 7. UBM is useful in patients who have had a traumatic injury. It allows one to examine the anterior segment in the presence of an opaque media, caused by hyphaemas, corneal blood staining, corneal oedema and severe anterior segment inflammation. Scans can show cyclodialysis clefts, angle recession, corneal blood-staining and foreign bodies.
Figure Blunt trauma causing cyclodialysis cleft. A direct communication between the supra-ciliary space and anterior chamber can be visualised. Cyclodialysis clefts can be iatrogenic or more commonly secondary to contusion injuries. Defined as a disinsertion of the ciliary body from the scleral spur, the injury allows access to the suprachoroidal space resulting in hypotony. Visualisation of the supraciliary fluid and the connection from the anterior chamber to the supraciliary space confirms the diagnosis of a cyclodialysis cleft Figure Direct gonioscopy once the eye is filled with viscoelastic is the definitive way of determining the location and extent of the cleft, principally because the iris will otherwise obscure the angle.
UBM is useful in this scenario as it provides a way of knowing the location and extent of the cleft without physically entering the anterior chamber. Figure Foreign body visualised within the lens.
The entry area hyper-reflective scarring in the cornea is seen. The splitting of the iris is the assumed course of the foreign body. Highly reflective areas are indicative of the foreign bodies. Intraocular foreign bodies are usually hyper reflective and show up readily in UBM examinations especially in the anterior chamber Figure B scan ultrasonography is the investigation of choice for when the foreign body is in the posterior segment. Due to the many clinical entities that can be identified, beyond coherent light machines where the iris blocks more posterior structures, providers have embraced ultrasound biomicroscopy.
Its use has migrated from academic to hospital settings. Views Total views.
Actions Shares. Embeds 0 No embeds. No notes for slide. Transducer 2. High-frequency signal processing. Video monitor 9. Transducer 50 MHz This radiofrequency travels the body tissue and is reflected back to the transducer.
The reflected radio frequency is processed by the signal processing unit. Patient in supine position Local anesthetic Eye cup plastic or silicone which is used to create a small water bath Methyl cellulose or normal saline can be used as coupling solution The reflected signal is best detected when the transducer is oriented so that the ultrasound beam strikes the targeted surface perpendicularly The crystal of the transducer is placed in saline approximately 2 mm from the eye surface.
This distance of 2 mm prevents injury to the cornea and also helps as a fluid standoff. Cannot determine lens thickness cannot penetrate till post capsule of lens Measurement of AC angle B The angle is open with a flattened iris after laser peripheral iridotomy. The ciliary process was anteriorly directed, supporting the peripheral iris so that it was parallel to the trabecular meshwork. The iris root had a steep rise from its point of insertion, followed by a downward angulation from the corneoscleral wall. Presence of a central flat iris plane.
An absent ciliary sulcus. Irido-angle contact above the level of the scleral spur in the same quadrant.