Regularly clean your eyeglasses with a micro fiber cloth which are specially made for eyeglasses. Keep the cloth in a separate box to protect it from dust after use. Whenever the cloth is not at hand use an alternate soft cloth rather than any paper towels or tissue papers.
Make sure the arms of your frames are always tight by using a tiny screw driver to tighten the screw connecting the arm to the front of your glasses. This would prevent your glasses from slipping and also your lenses from falling out of the frames.
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Always place your eyeglasses in a safe hard case when not in use. Also, clean your lenses using soap and warm water regularly.
It is always better to opt for the weaker prescription rather than strong as it helps to improve your vision gradually.