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Computer screen and eye protection

   Computer screen the impact of vision on the eye:
   1. The eye does not tear as long as 10 seconds of moisture, part of corneal epithelial cells become dry, there will be severe corneal ulcers, damage. Surface layer of the eye to form the tear film tear, can maintain a moist eye, if uneven distribution of tears, the eyes will feel dry discomfort, while there will be foreign body sensation, eye secretions increase, therefore, the eyes for 10 seconds, if not reduce the number of tear secretion, or blink, tear evaporation too quickly, the cornea begins to feel dry, under the microscope, the cornea becomes transparent as the original "ground glass" the same.
   2. With a computer, the attention is too focused on the lower screen makes the blink, the general will reduce about 10%, reduced tear production, and the eye longer exposed to the dry air environment, so that the eye too fast evaporation, is likely to cause dry eye discomfort. Always in the eye with excessive tension, eye muscle will fatigue, resulting in a lot of eye discomfort.
   3. For eye discomfort caused by overuse, be careful not to row with the eye for too long, always looking out the window and pay attention to visuals; care to avoid the dry, windy environment to stay too long; basin of water in air-conditioned room with , conditional use humidifier to keep the indoor humidity.

   Computer screen the potential consequences of eye:
   1. Eye appears normal visual function disorders: visual disturbance are the contraction of the pupil, eye shape, corneal curvature, the retinal blood circulation disorders of different degrees.
   2. Acuity decreased significantly: In general, screen cause of vision loss is temporary functional changes in visual acuity by the rest can, if every time the computer screen every 2 hours or more before the work can make temporary vision decreased about 30%. A long time, it can not return to normal. Especially for myopia and congenital amblyopia should pay attention. Otherwise, decreased vision faster.
   3. Eye fatigue: the eye stimulated by light screen, the eye will cause muscle cramps, abnormal pupil contraction, can cause eye fatigue, sleepy, soreness, dryness and other uncomfortable. Severe cases can cause tears, dizziness, and even can cause nausea.
   4. The eyes can not see from the hazy: screen light on the regulatory function of the eye also affected, so that ciliary muscle and lens a relaxation exercise are not well adapted to changing requirements as objects, can not focus on the retina, it seems a layer of something posted on the eyes, so to see things blurred. This change arbitrary strong, irregular, hidden, at the time, called pseudo-myopia. If you do the same endure, this pseudo-myopia will become true myopia.
   5. Dry eyes, pain in: about 80% of the computer operator has a different sense of the degree of eye pain. In severe cases, can even cause eye neuralgia, and some have dry eyes, feeling the pain. If you find the pain to a certain degree of dryness, and suddenly could not help and watery eyes, the cornea is difficult to open when the show has been seriously hurt, eyes closed as soon as possible bed rest.
   6. May lead to other eye disease: long-term if the computer screen to protect workers, causing pink eye, or traumatic cataract, may reduce the resistance of eye disease epidemic.

   Prevent and reduce computer eye injury:
   1. Establish conservation awareness: working hours should be reasonable, should rest 1 hour and 10 minutes, and then do some eye exercises, and then continue.
   2. To ensure that certain working conditions:
   a. reasonable keyboard and seat position to the body but before the probe were appropriate.
   b. the distance between the computer desk is not less than 1.5 meters, the distance between the screen should not be less than 2.2 meters.
   c. to avoid bright light, the top soft light, especially fluorescent.
   d. location of the computer screen should be at right angles to the window. To avoid the windows or back windows, the windows should be fitted with hanging curtains or blinds.
   e. studio should protect a certain temperature and humidity, the best temperature is 21 ℃, humidity 60%, which prevents the operation of the computer caused by dry eyes.
   f. the best glasses to wear anti-waves.
   3. Food Note: should eat more whole grains, Eat less sugar, eat more fruit, more fresh liver, fish, Eat greasy food to meet the service of some vitamins B1, B12 and C and so there are certain advantages to protect the eyes.

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