Light entering the eye is imaged on the retina at the back of the eye. The macula is a small area in the centre of the retina. This is the part of the eye that we use to read and see fine detail. The macula consists of several layers of tiny cells. As we get older, some of these can fail to function properly. This can lead to a build up of deposits in the retina and the growth of new blood vessels. These new blood vessels are fragile and bleed easily. If this happens, there may be a sudden loss of central vision and objects may appear distorted.