Cataract is a very well known impairment of the vision. This is a condition where the whole or part of the lens inside the eye gets clouded. Due to the cloudiness created, light is prevented from entering the retina and this, in turn, causes a general loss of vision. The main cause of cataract disease is ageing but other causes also include prolonged exposure to ultraviolet radiation from the sun, disease, injury and at times even genetic disorders. If the eye is healthy enough surgery can be performed in order to have the cataract removed. Apart from that, even intraocular can be implanted inside the eye to have the vision restored.