Cataracts usually form slowly and cause few symptoms until they noticeably block light. Symptoms can include:
Vision that is cloudy, blurry, foggy, or filmy
Progressive nearsightedness in older people often called "second sight" because although their distance vision is getting worse, they may no longer need reading glasses
Changes in the way you see color
Problems driving at night such as glare from oncoming headlights
Problems with glare during the day
Double vision
Sudden changes in your glasses prescription