Sharpness zone (VIDEO) Optica This video is under embargo. Please login to access this video. Caption The spiral lens (bottom) extends the of the sharpness zone beyond what is possible with a classic lens (top). Credit Laurent Galinier Usage Restrictions None License Original 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.