Originally Posted by VegaVixen
When you first start wearing contacts, it seems as though you have to keep puttin' drops in all the time. Eventually this goes away. Another concern is: how much correction do you require?
If it's large, especially with astigmatism correction, you have to be careful with regard to how tightly you squeeze your eyes shut, or to how high or low you roll them. Otherwise, they could roll on you, or otherwise pop out onto your eyelashes. But if you are aware of this possibility, and don't do those things, and keep them adequately hydrated, you shouldn't have a problem. Took me a while to get used to mine playing doubles tennis. So not good when you can't see the ball just before it hits ya between the eyes!
I wear contacts that should be cleaned at least every two weeks, and worn for a max of four. 
I shouldn't tell you this, but I've been wearing the same pair since end of March. Non-stop. Yeah, I know. Time to change 'em out. If anyone wants to trade lives with me, I welcome a PM.
Regardless of the power, if a lens is fit correctly, it should not become displaced due to excessive eye movements or blinking. If this does occur, probable cause is a loose fit.
The lenses you wear are called "planned replacement", meaning that they should only be used for a period of time determined by your ECP (eye care professional). There is a lot of flexibility in the process, some patients can only go 2 weeks max, others can safely wear the same pair for 3 or 4 months. Primary factors that affect wearability...compliance with
DAILY cleaning and disinfection, and the individuals tear film. Excessive protein buildup from tears will accumulate on the lens surface, and they will begin to feel dirty. When that happens, it's time to discard, and open up a fresh pair.
Please tell me that you are removing them, and not sleeping with them on.