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The lens has a loose-fitting and a tight-fitting depending on the fitting condition. Compared with clothes, if you wear loose clothes, it will flow down, and if you wear small clothes, it will be too tight and uncomfortable. Contact lenses have a direct relationship to vision, so too loose or too tight can affect vision.
First, the tight-fitting state is that the lens is tightly attached to the corneal surface. A person blinks and tears and oxygen exchanges. When tightly fitting, it interferes with tear exchange, which makes oxygen exchange difficult and affects vision. As a result, the cornea may swell. If the lens is too uncomfortable and hard to blink, consider fitting to the lens.
Loose-fitting is a fitting condition in which the lens is loosely attached to the corneal surface. Because of loosening, the lens tends to sag down. Because of unstable eyesight, subjective discomfort is greater than tight-fitting. Every time you blink, you feel a foreign body on your upper eyelid and your glare. If this happens, you should consider the fitting of the lens.
Unlike glasses, the lens has a direct effect on the eyes, so special care should be taken.
First, do not change the label or type of solution without consulting your doctor. Because the solution is prescribed differently for each lens or patient's condition, it is better not to change it. Soft lenses should not be cleaned with hard lens solution and vice versa. Do not put two soft lenses in the same place on the case. Not only can the lens be difficult to distinguish between the right and left eyes, but the lenses may not stick together. In addition, the lens case should be replaced regularly, and the lens should be cleaned immediately after removal from the eye.
In subjective symptoms, there is a sudden sense of foreign body, which is likely due to foreign objects. Some adaptive glare should be visited by an optician or ophthalmologist when complaining of normal but severe glare. In addition, the lens may become drier when used in an environment that makes the eyes dry, such as air conditioning heating or smartphones. Sleeping with a lens can cause temporary lens attachment, which should be done with gentle compression of physiological saline or eyelids.
The lens is also affected by wear time. The wear schedule should be followed to make the lens healthier. For example, hard lenses should be worn for eight hours. When wearing hard lenses for the first time, the first day should be scheduled for 3 hours and the next day for 4 hours. Soft lenses can be worn for a long time. The first day should be gradually increased to six hours and the next day to eight hours. Wear schedules are not ideal and should be recognized as a maximum. Overwear can be dangerous.