While using lenses always follow these precautions-

Wash your hands with mild soap and wipe with lint free tissues before handling the lenses or touching your eyes.
Avoid using creams, deodorants or perfumes before inserting your lenses.When handling lenses, work over a clean flat surface.
If you drop the lens, touch and pick it with a wet forefinger using a solution. Clean and rinse with the contact lens solution before inserting.
Clean, rinse and store the lens with the recommended contact lens solution after every use.
Always keep a pair of spectacles handy.
Remove lenses while swimming.
Consult eye specialist if you have an unexplained , persistent pain, discomfort, change in vision, excessive tearing, light sensitivity or unusual eye secretions.