American eye care products developer Alcon laboratories has designed a new lens called Acry Sof Natural Lens, which, it claims to be a better replacement lens. Patients who undergo cataract surgery often complain of the replacement lens being like a pair of heavy-duty sunglasses. The new lens from Alcon promises to filter out rays that can be dangerous. The existing lenses block only UV rays from reaching to the eye. Acry Sof claims to blocks blue light too. But, there is no difference in the costs of the conventional lenses.