Is it safe to wear contact lense on an eye only?

I've done this for 3 months. I buy a pair and I wear one of it for 12 hours on left eyes and wear another lense for next 12 hours on the right eye.

I afraid it would cause long term effect. Is it safe?

Yes, it as safe.
If you are typical, you suffer from nearsightedness=myopia. When you wear just one contact lens, you get corrected vision in that eye, but unless your correction is really high, you have near vision in the other.
In fact, for people who have to do alot of close work, in Lasik surgeries there is a variation where they correct one eye to 20/20 distance vision, but do less correction to the other eye so it maintains near vision. The brain learns to "switch eyes" depending on the distance you're focusing.

Yes, this is safe, as long as you can SEE CLEARLY. If you can see normally how you can with two contacts in both of your eyes, you are safe. Keep on transferring that contact to both of your eyes, and you will be fine.

Well, it depends. If both of your eyes have the same vision, then it's not really safe. One eye will be seeing significantly better than the other. Even though you switch periodically, it still may cause harm to your eyes. I'd suggest wearing both at the same time to prevent visual damage.

well, i have contact lenses and when i only have one contact to wear, i wear only one.

your eye is actually supposed to block out the eye that you cant see very well with and just use the dominate eye.

and no it is not safe, my boyfriends mother is a nurse and she tells me all the time all the bad things that can happen.

your not saving any money ether, and your going to have to pay more if you get a astigmatisms.

my advise use both of them, that's what they were made for.

hope it all goes well
sahara

no it isnt safe. obviously, each of your eyes wears lenses, therefore both should be on at one time