The nearsightedness belongs to the eye refraction to be unusual, generally speaking, is smaller than 300 degree mild nearsightedness complications are very few, but is bigger than 600 degrees high nearsightedness, around his/her eyeball the diameter lengthens obviously, but the cheap sunglasses  retina and the choroid actually cannot corresponding lengthening, thus causes the retina, the choroid to elongate and to assume the diffused to wither,
 the corresponding blood vessel also becomes even more slender, why did this is also say that the shortsighted patient was not highly suitable the situation which gave blood. The reason that has stressed the shortsighted patient is not suitable the reason which gives blood is highly the shortsighted patient's blood vessel to the blood pressure change is highly sensitive, simultaneously the eye vitreous body may turn the liquid state by the porodine. Gives blood when the blood pressure will have the slight fluctuation, is pulled regarding the eyeground blood vessel the slender high nearsightedness, possibly will create the eyeground vasospasm, caused already pathological change's retina to present the hiatus, this time liquefied the vitreous body will seize the chance to enter under the retina, created detachment of retina, serious influence vision. Although gives blood is an honorable matter, but the reality had actually decided the shortsighted patient is not highly suitable to give blood, if insists to give blood, possibly will cause the ocular region blood supply insufficiency, will cause the vision to further drop. The brain operator loves road of the eye! Now the majority of shortsighted patients are the company white-collar, because works for a long time before the computer the nearsightedness which causes, then how the sunglasses shop computer operator does change to cherish the eye? Below we the eye doctors come everybody introduction to analyze: Because many people work the relations, must face the computer all day, like this is very for a long time easy “to be exhausted” the eye. In the ophthalmology department outpatient service, often may listen to the patient to relate that the eye strain, the eye do, the headache. The majority of patient principal claim eye does is astringent, is scalding hot, perhaps has the sense, the vision is unstable, blurs temporarily, will think possibly also that the eyelid will be heavy, eyeball painfully swollen even headache. By way of the detailed ophthalmic testing, discovered that has the hyperemic conjunctiva, the vision to drop, the adjustment strength to drop, tear fluid secretion reduction and so on symptoms, is serious when will have the situation production which the intraocular pressure will elevate.
 This is mainly because the partial crowds face the computer for a long time, and the posture is not correct, approaches the computer fluorescent screen excessively, compared with easy to receive the radiation the injury, when particularly uses the notebook, because the fluorescent discount sunglasses screen is too small, causes the user to the short distance work, the forehead to the anteversion, the pate muscle effort, very easy to form the work to be tired, aggravates eye's weariness.