If a cataract is left untreated, your symptoms will worsen, leading to the point of complete blindness. Often a swollen cataractous lens may block your aqueous pathway leading to a surge in the intraocular pressure which will need emergency treatment to subside. Avoiding cataract surgery for too long will make cataracts hyper mature, leading to complications in the surgery and a substandard outcome after it. It is best to get your cataracts operated on at the right time to prevent such complications.