Have there been times when you've left your soft contact lenses in for a little too long? It's common knowledge that most things are in in top form when they're new. Guess what? The same idea is also applicable to your contacts. You should never keep your contacts in your eyes for longer than you've been instructed to. Of course, it might seem harmless to wear them just one more time, if you care about your eyes, don't overlook the replacement regime given to you by your optometrist. This means that if your optician tells you to change them every two weeks, then change them every two weeks, because they're not made to withstand reuse.
You might think, would it be so bad if I got a couple extra days out of them? To answer this, let's take a look at protein - not the type you stir into your shakes, but the natural protein contained in your eye fluids that slowly accumulates on the surface of your lenses which forms a light haze. Blurry eyesight is only the first symptom.
As time goes on, these proteins evolve and confuse your immune system, which begins to think that the formation is something foreign, and the body's reaction can be expressed as eye irritation, itching and redness. Which means a toll is taken on your vision. External particles like pollen or dust can also accumulate on the lens, which also makes sight blurry. Even when you're thorough about caring for your contacts, sooner or later they become less smooth and clear, due to normal deterioration.
It's smart to adhere to the routine your optometrist has instructed you to. Everyone's eyes are different, so only your optometrist should determine the best contact lens replacement routine for you. When you change your lenses when you're told to, you'll never even see the difference that is so obvious when you wear them for longer than you're supposed to.