1- Do not put on or take off your glasses with one hand. 2- Do not place the lenses upside down on a hard surface. 3- Do not carry them without a protective case in your bag or pocket, where they may become crushed or deformed. 4- Clean them daily with soft cloth after washing with clean water to prevent the corrosive and damaging effects of acidic skin secretions. 5- Keep them away from cosmetics, acetone, alcohol, and dusty environments. 6- Do not leave them exposed to direct sunlight and heat on car windows, beaches, sand, or concrete. 7- Do not use them in environments requiring protective eyewear, during sports activities, or in saunas. 8- Never use your glasses if they have lost their quality.