Contact lenses are designed to rest on the cornea. They are held in place mainly by sticking to the tear film that covers the front of the eye and a little by the pressure of the eyelids.
As the eye blinks, the eyelid slides over the surface of the contact lens, causing its front to move slightly. This action allows the tears to provide the necessary lubrication and helps to wash away the deposits.
Too tight the lens will not move at all. May cause eye sensitivity. At first, the user may be comfortable, but visual acuity is poor. It can cause complications in the long term.
Too loose lens moves excessively. The lower eyelid lens feels a lot. After blinking, the image is blurred. The lens is off-center. Lens edges can be bent.
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