Slide plate is a common phenomenon in the process of wearing contact lenses. It can be said that any contact lens will have a certain deviation.In general, slight sliders can be ignored, but if the deviation is serious enough to affect the sight or cause discomfort, attention should be paid.So, what is the cause of contact lens slide?
Speaking of contact lens slide, we have to mention an important parameter of contact lens - base arc.The base arc corresponds to corneal curvature, and the larger the base arc, the flatter the lens.In general, most Asians have an eye curve between 8.4 and 8.6, so most contact lenses on the market fall within this range.However, if a small number of wearers have an eye Angle of less than 8.4, sliders will occur when they wear most contact lenses.
That is to say, inappropriate base arc is the main cause of contact lens slide. When the base arc is too large, the lens positioning is unstable, and it is easy to loose and fall off when the eye rolls or blinks.Slide film will directly affect the clarity and correction effect, reduce the wearing comfort, may also cause the lens hidden in the corneal capsule is difficult to take out, only to increase trouble.Therefore, contact lenses fit is very important, before buying contact lenses, we must go to the regular glasses place to receive professional eye examination.
According to the results of the matching examination, if no suitable base arc is found during the matching, the larger one should be selected from the two values of the smaller one and the larger one, so as to avoid the lens sticking closely to the cornea and affecting the corneal respiration.Of course, in addition to the base arc, wearing inverse lenses or poor lens quality can also cause slide, but if the slide still occurs after several products are worn, it is almost certainly the base arc.