الفهرس 
Anatomy of The Lens areaOnly 14 pages are availabe for public view
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Abstract
Ultrasound Biomicroscopy (UBM) is a technique primarily used for imaging of the anterior segment (AS) of the eye. Compared to regular ultrasound modalities such as B scan (10 MHz), UBM uses a much higher frequency transducer (35-100 MHz). This results in resolutions up to 20um axially and 50um laterally, and depth of tissue penetration is 4-5mm. UBM can be used for imaging much of the anatomy of the anterior segment, as well as associated pathologies, including angle closure glaucoma, ciliary body cysts, neoplasms, and angle trauma. In our study, we examined thirty eyes for patients suffering from lens pathology by B Scan Ultrasonography, Immersion UBM and Contact UBM and we found that the mean value of the anterior chamber depth by immersion UBM and contact UBM was 2.565 ± 0.292 mm (range from 2.11 mm to 3.04 mm) and 2.183 ± 0.457 mm (range from 1.52 mm to 2.99 mm) respectively with statistically significant difference between the values measured by the two methods (p value <0.001). The mean value of the anterior chamber angle by immersion UBM and contact UBM was 26.30° ± 9.61° (range from 0° to 40.7°) and 22.41° ± 7.95° (range from 0° to 34.8°) respectively with statistically significant difference between the values measured by the two methods (p value <0.001). The mean value of the central corneal thickness by immersion UBM and contact UBM was 0.589 ± 0.037 mm (range from 0.5 mm to 1.5 mm) and 0.596 ± 0.042 mm (range from 0.48 mm to 1.57 mm) respectively with statistically insignificant difference between the values measured by the two methods (p value = 0.231). The mean value of the lens thickness by immersion UBM and contact UBM was 3.697 ± 0.101 mm (range from 3.06 mm to 5.06 mm) and 3.697 ± 0.108 mm (range from 3.02 mm to 5.22 mm) respectively with statistically insignificant difference between the values measured by the two methods (p value = 0.981). B scan ultrasonography didn’t give us information about corneal thickness, anterior chamber depth and angle or lens thickness but only gave us information about the presence of crystalline lens and if cataractous or not and insitu or not. B scan ultrasonography had only advantage that it could evaluate and assess posterior segment where UBM couldn’t.