This is part 2 of a 4-part video series titled "A-Scan Biometry." A-scan ultrasonography remains the standard technique for measuring axial length in IOL power calculation. In this series of videos, Sandra Frazier Byrne discusses the principles of A-scan ultrasound, demonstrates the applanation and immersion methods, and explains how to manage difficult situations and common errors.

Part 1: A-Scan Biometry: Principles of Ultrasound
Part 2: A-Scan Biometry: Applanation Technique
Part 3: A-Scan Biometry: Immersion Technique
Part 4: A-Scan Biometry: Problems and Solutions