You may notice that your bleach is not working anymore, and your white clothing is not as bright as it once was. Your glasses are always dirty no matter how many times you wipe them off. The characters on the television are hard to make out, and headlights on the road at night wash out your vision.
What you do not notice is that you no longer read the paper, and you move through your surroundings slower. You stop enjoying activities that require precision; crossword puzzles, bird watching, and sewing.
You have cataracts.