The fur and skin of household pets Food products that include flour, oil, grease, or spices Workplace objects, including stair railings and elevator buttons

Adjusting your glasses by gripping the frames will become a habit over time if you do it consistently and never adjust your glasses by pressing on the lenses.

Bacon or other pan-fried meats Eggs Anything sautéed, especially onions

Wash your face regularly—at least once a day—to prevent oils from building up and smudging your lenses. If you have long bangs, these can carry oils as well, and potentially transfer that oil to your lenses. Pin your bangs back to prevent them from smudging your glasses.

Although rainwater will evaporate from your glasses, it will leave behind a residue which smears the lenses. If small dust particles get stuck to your glasses, do not try to rub them off without first rinsing the lenses. Dust can permanently scratch your lenses if rubbed or pressed farther into the glass.

Even if you’re only lying down to rest, take off your glasses. It’s not worth the risk of rolling over and snapping the frames.

Because of its high oil content, makeup can be difficult to remove from your lenses.

It’s a good idea to wash your hands as well, so that you’re not smearing oils from your fingers onto the lenses. Hot water can damage anti-glare treatments.

You can also use hand soap to clean your lenses. Make sure that it is a lotion-free soap, though; otherwise you’ll smudge the lenses with the lotion in the soap. [3] X Research source

Be sure the cloth used to dry the lenses has not been laundered with fabric softener or a dryer sheet. Doing so can leave streaks behind. Never spit on your glasses, or clean your lenses using saliva. Saliva is not sanitary and often contains germs and oils which will smudge your glasses. [5] X Research source

Keep your glasses in their case whenever you’re sleeping. If they’re reading glasses, keep them in a glasses case (when you’re doing an activity other than reading) to prevent dust from getting on them.

If you get dust and water or smears of some sort on them, you can just grab your cloth out of your case and clean the lenses. Avoid cleaning the lenses with your shirt, as the fabric will not be as clean as the microfiber cloth. [7] X Research source

Many people who wear glasses also have backup contact lenses, and choose to wear these when they’re playing sports.