青少年的眼睛发育尚未稳定,18岁以下的近视眼,每年眼镜度数增长一般不超过100度。相比较而言,偶尔戴眼镜或者从来不佩戴眼镜者,眼睛长期处于离焦(朦胧)及疲劳状态,会造成视觉敏锐度不佳,眼睛会聚能力下降,其近视度数更容易增长。而成人经常佩戴近视眼镜,则有利于缓解眼睛疲劳、保护眼睛,还可以推迟老花眼的发生。只有那些用眼要求不高的成年近视患者,平时也不存在视疲劳症状,并排除斜视等眼部疾患,可以在只需要获得清晰图像时才佩戴眼镜。因此,一旦发现近视,最好及时到正规医院进行验光,去除假性近视,并获取准确而合适的屈光度数。
来源:作文大全网 收集整理|别忘了推荐给您的好友<br>Dear Mr.Huang,<br>We have never seen for one year, I miss you very much.It is say that you did an operation in September.How are you now? I hope that you have recovered.Thank you for your enlightening in the important time of my life.I won't forget your edification.<br>Iam in the XX University now.It locate in the beautiful city Hangzhou. I invite you to have a journey to Hangzhou next summer if you have time then.My major is English,but I always feel shamed to speak and show in English in the class.I would change the actuality gradually.Now I like sports very much especially basketball.You would see a healthy and stronge David next time.The life in the university is colorful.I like it.And I shall study hard.<br>The new year is on the way, I pray the God to bless you to be happy and healthy in the coming year.And give my best regards to your families.<br>Happy New Year!<br>Yours faithfully,<br>David