Hi, Please be informed that our lenses are completely safe to use as these lenses are approved by Korean FDA. As long as you follow our wear and care guide / chose the correct prescription for your eyes, you will not face any discomfort problems. We seldom receive complaints that our lenses damage our costumers eyes, however when we receive it we go through thorough investigation. Most of the cases happened due to non hygienic handling of lenses. If you do not have prescription, you may use either of the lenses to your left and right eyes. For further clarification, please email to enquiry@pinkyparadise.com. Thanks.

It all depends on the user and if you know how to properly use them pinky paradise lenses are absolutely safe, if don't have prescription you can use it in either eye but after just make sure you don't mess them up and accidentally keep switching eyes keep them in L & R the longest I've worn my contacts was for about 11 hours but your eyes become extremely tired I DON'T recommend it its just I didn't keep track of time. - Good Luck!^-^ enjoy them!

Any contact lense can end up with a fault in them or cause damage if worn incorrectly. Checking them over before wearing for any scratches or tares can reduce the risk additionally going to an optimist to check the fit is a good idea not all contacts are made equal.
Waring contacts for too long can also suffocate your eyes so you will want to think about how long your wearing them. Low water content contacts usually aren't recommended for more than 4 hours, contacts in general have a suggested 8 hour wear time. So watch how long you have them in.
Sometimes the bottles will come with L and R marked on them. But as of yet i have never found this detromental to the wearing of them