Panoramic Observation of Crystalline Lenses with 25 MHz Ultrasonography

Figure 1

A 25 MHz ultrasonographic image of the left eye of a 40-year-old female. The gain was set to 100 dB, the dynamic range to 70 dB, and the time gain compensation to 0 dB. The entire contour of the lens, including the equator anterior and posterior surfaces, was clearly visible. Using the calipers, yellow lines, shown in the image, the axial lens thickness and equatorial lens diameter were calculated as 4.09 mm (C1) and 9.15 mm (C2), respectively.