A cataract comes about when your eye's lens starts to become cloudy. This cloudiness does not occur overnight but instead will become worse progressively. When you develop a cataract, the vision in the affected eye steadily turns blurry. And the longer the cataract goes undiagnosed and treated, the more your vision deteriorates, and it could even lead to loss of sight. Since cataracts are not painful, some people may ignore this problem under the assumption that their vision will correct itself.
12 October 2018