The I3 SYSTEM is an advanced, microprocessor controlled, analog/digital ophthalmic ultrasound instrument. Features include B-scan mode with electronic measurement calipers and simultaneous Cross Vector A-scan, Anterior Segment B-scan mode for imaging of anterior ocular structures, Axial Length Biometry A-scan mode with Holladay-I, SRK/T, and Hoffer-Q IOL power calculations, and Standardized Equivalent Diagnostic A-scan mode for tissue characterization. The instrument has been designed to be very user friendly, with access to all modes available through a single keystroke. Images may be stored on an Iomega Zip 750 disk, across a network, or via 1.44MB floppy disks, and later recalled for additional evaluation. Hardcopy output is available either via video printer or by using an external computer to print TIFF images. Biometry IOL reports are printed using the supplied impact printer.

Posterior Segment Diagnostic B-scan mode (10 MHz): The system produces a two dimensional, 52-degree, geometrically accurate analog sector image with superior real time, resolution, and gray scale qualities. The image extends 48mm into the eye allowing imaging of objects from the lens to the orbit. B-mode images may be displayed with or without a measurement scale or a Cross Vector. The Cross Vector may be positioned anywhere in the B-scan or expanded to an A-scan view for accurate measurements. Two electronic measurement calipers may be used to make accurate measurements on the B-scan itself.

Anterior Segment Diagnostic B-scan mode (20 MHz): This mode is also called Wide Field. In this mode the sector angle is 30-degrees, and the image is magnified four times more than the B-scan. The image penetrates 12mm into the eye allowing imaging of the cornea, ciliary structures, and other anterior ocular structures. Electronic measurement calipers and the measurement scale are available. There is no Cross-Vector A-scan measurement available in the Anterior Segment B-scan mode.

Standardized Equivalent Diagnostic-A: In Diagnostic A-mode the system produces an analog A-scan with superior clinical quality using an S-shaped amplifier for tissue characterization. Accurate 2 gate measurements may be performed in both microseconds and millimeters using velocities that may be adjusted by the user. Globe and orbit modes are available, along with a tissue sensitivity reset function.

Biometry A扫描模式：在所有生物谱模式中，系统产生具有卓越临床质量的A扫描，可用于眼睛的精确轴向长度测量。仪器易于设置浸入或接触生物法。仪器旨在确保用于验证测量的内部过程对用户可见。这是一个非常重要的例子是可见指示，电子测量卡尺（或'门）的回声是测量的。另一个例子是用于计算报告的测量的超声波速度的屏幕显示。这些功能可帮助用户识别高质量的扫描，该扫描将产生精确的测量（并且因此，何时拒绝较低质量的扫描）。