Most cataracts develop slowly and don’t disturb eyesight early on. But with time, cataracts will eventually affect vision. At first, the cloudiness in your vision caused by a cataract may affect only a small part of the eye’s lens. You may not notice any vision loss. As the cataract grows larger, it clouds more of your lens. More clouding changes the light passing through the lens. This may lead to symptoms you notice more.
Fortunately, cataract surgery is generally a safe, effective procedure.
(Source www.mayoclinic.org)