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Abstract
Ultrasound biomicroscopy is a new technology that uses high frequency ultrasound and thus shows minute description of the anterior portion of the globe in microscopic resolution. It is independent of the clarity of the media and allows, for the first time, a nonivasive demonstration of the structures of the posterior chamber and their relationship to each other. (Munnich et al 1995)
It is an ultrasound method working at high frequencies between 40 and 100 MHz. It is possible to resolve structures up to approximately 50 microns in size at a maximal depth of 5mm. (Bergmann et al, 1995)
It gives new morphology image information about the anterior eye segment, which is not available using conventional gonioscopy or ophthalmic echography especially in hazy and opaque media. (Nemeth et al, 1996-1997)
With such information ultrasound biomicroscopy offers additional details for differential diagnosis and treatment of the various forms of glaucoma (Munnich et al, 1995)
It gives adequate method of determining the position of IOL haptic postoperatively since in most cases surgical placement of iris fixed lenses is a blind procedure. (Walther et al, 1997).
It is a safe & effective adjunctive tool for the clinical assessment and management of anterior ocular trauma, especially when visualization is limited and multiple traumatic injuries are involved (Berinstien et al, 1997)
In comparison to UBM, optical coherence tomography (OCT) is a new non-invasive diagnostic tomographic technique using the property of optical reflectivity to evaluate cross-sectional images of ocular tissue with resolution less than 17um (Huang et al,1991).