Courtesy of topazarbell
Contact lenses are designed to float on your iris. Contact lenses do not stick to your eyes but keep floating every time you blink. Therefore, floating of circle contacts is considered healthy & normal. Usually, floating does not interfere with vision. However, sometimes depending on the design; contact lens movement may create hindrance in maintaining crisp vision. If you are suspicious about your contact lenses floating way too much, check by your doctor as it may be a sign of “astigmatism”. Healthy floating of circle lenses depends upon the following factors:
If contact lenses do not fit your eyes properly they stay loose due to which they can fall off or get trapped in the eyelid. The normal base curve values ranges between 8.00 to 10.00 mm. Circle lenses with 8.6mm fit best to most of the people. Contacts with too tight base curves can block oxygen permeation.
Blinking causes circle lenses to move several millimeters every time a person blinks. Due to blinking circle lenses are slightly decentered, but within fraction of seconds they relocate themselves without even letting you realize.
Tears facilitate contact lens floating. Tears help keeping your eyes and lenses moist that enables easy movement. This also helps better oxygen transmission to all the areas of cornea through tears. When eyes become dehydrated, floating is compromised that causes irritation & inflammation of eyes.
Contact lenses are made to float on eyes. However, some crazy reptilian designs that are 100% opaque may be very annoying when the slide up and move. They create obstacles in seeing clearly as they shift a few millimeters and float around. At Halloween, when you are nothing but a dare-devil, observe caution whilst wearing such crazy lenses. You may trip over in a dark alley due to poor sight. Other than few designs, floating of contact lenses must go unnoticed. If it is bothersome, get yourself an appointment from a doctor.