Webcam and Laser Pointer Results (IMAGE) Optica Caption The webcam setup (right) is just about as effective as the more expensive CCD camera setup (left) at showing the reduction in blood flow following a stroke. The green circle shows the stroke's affected area. Credit Andrew Dunn, University of Texas - Austin Usage Restrictions Must include caption and credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.