Optical Coherence Tomography/scanning Laser Ophthalmoscopy (OCT/SLO) of Normal Control and Optic Nerve Head Drusen. (Top) Transverse OCT/SLO Scan of Healthy Optic Nerve, Demonstrating Smooth Contour of Nerve Fiber Layer at Disc Margin, Converging to a Discernible Cup that Has a Base Shallower than the Level of the Retinal Pigment Epithelium (measured by Placing the First Horizontal Caliper at the Inner Aspect of the Red Stripe Designating the Retinal Pigment Epithelium, and Placing the Second Caliper at the Level of the Cup Base). In Each OCT/SLO Image, the Lower Right Hand Figure Demonstrates the Real-Time SLO Image. The Red Arrow Through the SLO Image Demonstrates Exact Positioning of the OCT Image. (Bottom) SLO-Guided OCT Image Is Demonstrating an Area of Hyperreflectivity with Overlying Nerve Fiber Layer Displacement (yellow Arrow) and Underlying Lucency. The Discernible Cup Is Significantly Elevated from the Reference Level of the Retinal Pigment Epithelium, Measuring 0.526 mm.