Why don't computers tell you when your glasses need cleaning?

Question

Can't the webcam be used to do this?Of course, you should only be told to clean your glasses when there are smudges near the center of a lens that would actually impact your vision when using the computer.

k310 · Accepted Answer

Solved! Put up a blank screen. If it's snowing, get out the microfiber. If it's hailing, wash them.
Next up, a holographic display that corrects for your vision. Optionally, adjusts to changes in real time.
Next up next. Eyeglasses that automatically dispense your eye drops. (You need to look up for this to work)
OIMV (Order of invention may vary)
Reminder, everyone. Use your monitor in a well-lighted room. A bright monitor in a dark room causes eye strain. Lost the study, but I can speak from experience.

khedoros1 · Answer

Do your glasses get so dirty that it's visible in a webcam image before you clean them yourself? In typical lighting conditions, I don't think my lenses' smudges are visible until well above the threshold where I'd clean them myself.

bigfatkitten · Answer

Is this not something you can determine with your own eyeballs?

marssaxman · Answer

If one's glasses have not yet become smudged badly enough to notice, what would be the point of cleaning them?