Ultrasonic A-B Scan for Ophthalmology. Ultrasonic A-B Scan for OphthalmologyDescriptionHIGH RESOLUTION IMAGESB, B+B, B+A, A FEATURES8 STEPS ZOOMPOST PROCESSINGREAL ... , vitreous length and axial lengthMeasuring method: Automatic (for normal, aphakic, pseudophakic, cataract)and manual10L power calculation ... : SRK-I, SRK-II, SRK/T, BINKHOST-II, HOLLADAY ...