Eyes away from the computer screen 50cm
Many young people away from the computer can not carry out normal work, which also led to the emergence of many young people overuse symptoms of eye fatigue, blurred vision and obvious, decreased vision, there will be severe dry eyes, headaches and discomfort. Experts advise, though always emphasized scientific eye, but many young people in the eye discomfort, casually drops eyedrops, your eyes comfortable, it is no longer a concern, as the issue of fatigue. This is a big misunderstanding, the correct use of eye drops, artificial tears should be under the guidance of an ophthalmologist, a clear reason for eye discomfort, carried out under the guidance of a doctor."Chronic fatigue syndrome" is no longer synonymous with a symptom, and it is synonymous with systemic symptoms of discomfort. The "visual fatigue" muscle fatigue that is generated as a result of overuse and other eye tissue discomfort. It is not an independent disease, but by a set of multiple factors lead to fatigue syndrome. Can be expressed as: eye fatigue, heaviness eyelids, eye and periorbital pain, eye redness, blurred vision, dry eyes, tearing and even headaches, nausea, dizziness and discomfort. Severe cases can lead to myopia, inability to concentrate, memory loss, etc.
Beware of "video terminal syndrome."
For the long desk, watching the flashing screen, close work, the ability to regulate the excessive use of eyes, will increase attention to fatigue. The "video terminal syndrome" is derived, and it is due to long-term viewing a computer or a computer screen, blinking reduced tear is not well distributed evenly in the ocular surface, leading to dry eyes, eye astringent, fatigue, chronic conjunctivitis other eye symptoms.
Computer screen by a small fluorescent dots, eyes have to constantly adjust the focus to ensure visual clarity, the time is too long, it will be too fatigued muscle. When looking at the screen at the same time, the number of blinks will be reduced by 10%, reducing the output of tears; and eyeball prolonged exposure to air, so that the water evaporates too quickly, resulting in dry eye discomfort, severe and even damage the cornea.
To prevent a video terminal syndrome, it is recommended to keep the eye away from the computer screen with 50 to 60 cm; equipped with a dedicated computer chair, adjust the seat height and backrest angle; so that the geometric center of the screen is preferably located below the plane of view, but in 15 degrees within the corner; the most important thing is the duration of time using computers not too long, 50 minutes rest every 10 minutes. Promptly to the eyes do "physical" and more concerned with their own eyes, timely adjustment of vision, as do an exercise, do a do eye exercises, proper overlooking. In addition, to ensure adequate sleep, a balanced diet and regular life.
不少年轻人离了电脑就无法进行正常的工作，这也导致很多年轻人出现了用眼过度，视力疲劳的症状，出现明显的视物模糊、视力下降，严重的还会有眼干、头痛等不适。专家提醒，虽然一直强调科学用眼，但是很多年轻人会在眼部不适时，随便滴点眼药水，让眼睛舒服了，就不再关注视疲劳的问题了。这是一个比较大的误区，正确的使用眼药水、人工泪都应该在眼科医生的指导下，明确眼部不适的原因，在医生的指导下进行。
“慢性疲劳综合征”已经不再是一个症状的代名词了，它是全身症状不适的代名词。而“视疲劳”即由于用眼过度而产生的眼肌疲劳及其他眼组织不适。它也不是一个独立的疾病，而是由多因素导致的一组疲劳综合征。可以表现为：眼疲劳、眼皮沉重感、眼及眼眶周围疼痛、眼部充血、视物模糊、眼睛干涩、流泪等，甚至会出现头痛、恶心、眩晕等不适。严重者还会导致近视加深、注意力无法集中、记忆力下降等。
当心“视频终端综合征”
对于长时间伏案、注视闪烁的荧光屏，近距离工作，过度使用眼的调节能力，都会加重视疲劳。而“视频终端综合征”就衍生出来了，它是指由于长期注视电脑或者电脑屏幕，眨眼动作减少，泪液不能很好地均匀分布在眼表，导致眼干、眼涩、疲劳，慢性结膜炎等眼部不适症状。
电脑荧光屏由小荧光点组成，眼睛必须不断地调整焦距，以保证视物清晰，时间过长，眼肌就会过于疲劳。同时在注视荧光屏时，眨眼的次数会降低10％，减少了泪液的产出；而眼球长时间暴露在空气中，使水分蒸发过快，造成眼睛干涩不适，严重的甚至会损伤角膜。
要预防视频终端综合征，建议保持电脑屏幕跟眼睛的距离50～60厘米；配备专用的电脑椅，调整好座位高度和靠背角度；使荧光屏的几何中心最好位于视平面以下，但在15度角以内；最重要的一点，是一次使用电脑的持续时间不要太长，每隔50分钟休息10分钟。及时给眼睛做“体检”，多关注自己的眼睛，及时调整视力，如做一做运动、做一做眼保健操、适当远眺。另外，保证充足的睡眠、均衡的饮食及规律的生活。
眼干≠干眼症
“春煮生发”，从门诊上可以看出，春天干眼症、结膜炎、过敏性结膜炎的人群比冬天要多到3-4成。
我们提得比较多的“干眼症”，是由于用眼过度引起的泪液的数量不足或者质量差，导致的眼部不适。如眼部干涩、异物感、烧灼感、痒感、畏光、红痛、视物模糊、易疲劳、粘丝状分泌物等。这个病确诊也很简单，只要做两项检查就可以了，一个是泪液分泌实验，一个是泪膜破裂时间实验。
有些干眼是过敏引起的。过敏性结膜炎事实上是免疫系统的变态反应，这类人不仅有眼部症状，往往还伴有鼻塞（过敏性鼻炎）等身体其他症状，这类人群在治疗方面，最重要的是能确定并立即避免接触过敏原，即使不用药物，症状也可很快缓解。如果不能立刻查出或脱离过敏原，就要进一步进行药物治疗。
年轻人也可能患青光眼
很多大学生会在熄灯后玩手机，关灯后看电子书等习惯，这对眼睛的伤害很大。你知道吗？长期关灯玩手机、打游戏会得青光眼，这绝不是危言耸听。
原因是由于关灯后打游戏，玩手机，房间里面只剩下屏幕上发出的亮光，这时光线对比度会特别高，眼睛容易感到疲劳。同时，眨眼次数减少，泪液分泌减少，容易造成眼睛干涩。这也是为什么建议很多家庭看电视的时候，即使要节能，也应该在客厅里面安装一个小灯。
长时间对比光下用眼，本身就容易造成视疲劳，聚精会神地时间越长，屏幕上不断变换的光影对眼睛造成持续的刺激，当眼睛不停地捕捉这些光影时，就会对黑眼球表面的泪膜层造成损害，从而加剧眼睛的疲劳和干涩、刺痒等感觉，甚至使眼睛有刺痛、流泪、畏光等不适症状出现，从而影响视力甚至损害眼睛。持续的时间刺激，就可能影响血管神经调节中枢，使血管舒缩功能失调：一方面可使毛细血管扩张，血管通透性增加，造成睫状肌水肿、前移，堵塞前房角，使房水流出通道受阻；另一方面可使房水分泌过多，后房压力过高，周边虹膜受压向前移而使前房变浅，前房角变窄。这些因素均可引起眼压的急剧升高，最终导致青光眼急性发作。而青光眼是我国第一位不可逆致盲性眼病。
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