If you don't want to rely on eyeglasses every day to correct your vision, one option for you is with the use of contact lenses. However, contact lenses are not that easily dispensed by your eye doctor since it requires more than just a prescription. Your eye doctor must have the measurement of the shape of your eyes in order to provide a prescription that contains the proper fit of your lenses. More importantly, you should also be aware of the effects from wearing contact lenses to help you tell that you might have the wrong prescription. When you experience blurring of vision, consider this as a common side effect of wearing the wrong eye lenses. Contacts or contact lenses are designed to improve vision and a blurry vision defeats its purpose. When you have the wrong prescription, you may also observe a slight improvement of your vision but it will not be totally clear. When you wear an inaccurate vision prescription, it will not cause your vision to worsen but you will experience a lot of discomforts like eye strains and headaches. All people have a slight difference in the shapes of their cornea. When your cornea is fitted inaccurately, your prescription will also make a difference resulting to a lot of discomforts upon wearing contact lenses. Moreover, ill-fitting lenses have a greater tendency to move around the eye that can potentially cause scratching in the surface of the eye. And when the lens is too tight, it can lessen or diminish the amount of tears that nourish the eyes under the lens causing blurring of vision and irritation. Prolonged use of these inappropriate lenses can result to corneal infection followed by corneal ulcers.