Calcium-Based Deposits in the Eye (IMAGE) University College London Caption Hundreds of spheres of calcium-based compound hydroxyapatite (in purple), commonly found in teeth and bones. New UCL-led research has linked these tiny spheres to age-related macular degeneration. AMD is characterised by a build-up of mainly protein and fat containing deposits called 'drusen' in the retina. This zoomed-out image shows hundreds of hydroxyapatite spheres in drusen deposits within the eye. The image is about a third of a millimetre across. Credit Imre Lengyel, UCL Usage Restrictions None 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.