ARGENTUM / SCIENCE PHOTO LIBRARY ARGENTUM / SCIENCE PHOTO LIBRARY
Simulation of the effect on vision of macular degeneration, revealed in this field of a view of activity in Regent's Street, London. The macula is the central section of the retina, about 5mm wide & heavily pigmented, & rich in nerve cells (rods & cones). These cells have a high oxygen demand & the process of ageing, with the subsequent slowing down of the circulation, may deprive the macula of oxygen. The new blood vessels that form to compensate for this are weak and prone to break, leading to haemorrhage and exudate formation. This breakdown of the central part of the retina is reflected in a loss of vision in the centre of the visual field.
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