Contact lenses must be attached closely to eye corneas, and any eye movement will cause frictions with the lens, including eye blinking. Prolonged wearing increases frictions, causing huge damages to corneas. In addition, contact lenses lie directly on the surfaces of corneas and corneas can not breathe oxygen, and therefore, they are prone to hypoxia.
Corneas of patients with diabetes are more vulnerable than those ordinary people, and low immunity leads to increased risk of corneal infection and slow healing. Once damages occur, diabetes patients may not feel them, so long-term wearing is rather unfavorable. In addition, diabetes itself may cause eye diseases easily, and long-term wearing of contact lenses is not beneficial to the prevention of diabetic eye diseases.
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