11万余册作业本被召回!亮白纸张为何成为“视力杀手”?|国产免费无码一区二区
1. 陌陌影视在线观看高清完整版
2. 4399在线观看免费高清电视剧
近日,一则“11万余册作业本被召回”的消息引发众多家长关注。这些看似普通的作业本,竟因D65亮度和荧光亮度超标,存在损伤孩子视力的风险。本该助力学习的作业本,为何反成“视力杀手”?
南京市第二医院眼科副主任医师张芳玲介绍,新闻中提到的“D65亮度”和“D65荧光亮度”,正是问题的关键所在。
专家解释,D65亮度指的是纸张的洁白程度。国家标准明确规定,学生作业本的亮度应控制在55.0%至85.0%之间。纸张过白,如同雪地强光,会过度刺激视网膜,导致眼睛睫状肌持续紧张,容易引发视觉疲劳,长期使用可能诱发或加深近视。而纸张过黄、过暗,则会使纸笔反差降低,字迹难以辨认,孩子不得不凑近观看,同样加重视力负担。
而D65荧光亮度反映的则是纸张中荧光增白剂的含量。这类化学物质能让纸张看起来“洁白如新”,但在自然光或灯光中的紫外成分激发下,会产生大量蓝紫光。蓝紫光是可见光中能量较高、穿透性较强的一种,长期接触不仅加剧视疲劳,还可能对视网膜细胞造成潜在损伤。
张芳玲特别指出,不少家长习惯将办公室的复印纸带回家,给孩子打印作业和习题,这其实是一个常见的护眼误区。她指出,市面上的大多数复印纸为追求打印清晰度和视觉效果,其D65亮度普遍偏高,很多超过95%,甚至达到100%,远高于学生用品国家标准中85%的上限。长期使用这类高亮度纸张,无异于让孩子持续暴露在“光污染”环境中,极大增加视力受损风险。
专家提醒,为孩子选择学习用品时,切勿盲目追求“洁白”,应优先选择符合国家标准、亮度适中、无反光、无刺眼感的纸张。而除了作业本,生活中还有许多容易被忽视的“视力小偷”。例如手机、平板电脑等屏幕发出的蓝光,与荧光增白剂产生的蓝紫光类似,长时间使用易导致干眼、视疲劳和近视加深。长时间近距离用眼如连续练琴、画画、阅读等,会使眼睛调节肌肉持续紧张,缺乏放松,加速视力下降。“培养良好的用眼习惯,控制近距离用眼时间,增加户外活动,才是守护孩子明亮双眸的根本之道。”专家提醒。
通讯员 朱诺 扬子晚报/紫牛新闻记者 吕彦霖
hongguo,zuoweiyizhongguangfanfenbudeguoshi,chengzailefengfudewenhuayujingjijiazhi。raner,zaixiandainongyefazhanyushengtaibaohudebeijingxia,womenyinggaigengshenruditantaohongguodeduozhongyiyiyuqizaikechixufazhanzhongdezhongyaoxing。shouxian,hongguodeyingyangjiazhiburonghushi。yiqifengfudeweishengsu、kuangwuzhihekangyanghuawuzhizhucheng,hongguozaicujinrentijiankangfangmianfahuizhezhongyaozuoyong。liru,changjiandehongguoruyingtao、hongzaodeng,bujinweimeikekou,hainengzengqiangmianyili、gaishanjifu。zheshidehongguozaixiandairenzhuiqiujiankangyinshidechaoliuzhong,chengweilebukehuoquedeyuansu。qici,hongguodejingjijiazhitongyangxianzhu。suizherenmenduijiankangshipinxuqiudezengjia,hongguodeshichangxuqiuriyizengchang,chengweinongminzengshoudezhongyaolaiyuan。liru,zaiwoguodemouxiediqu,hongguochanyedefazhandaidonglexiangcunjingjidezhuanxing,nongmintongguozhongzhihongguoshixianlezengchanzengshou,gaishanleshenghuoshuiping。yinci,hongguobujinshiziranziyuan,gengshituidongdifangjingjifazhandezhongyaodongli。ciwai,hongguodezhongzhiyucaizhaiduishengtaihuanjingdeyingxiangyezhideguanzhu。helidehongguozhongzhimoshikeyicujinshengwuduoyangxing,gaishanturangzhiliang,jianshaobingchonghaidefasheng,xingchengliangxingdeshengtaixunhuan。womenyingchangdaoyikechixudefangshijinxinghongguozhongzhi,bimiannongyaohehuafeideguoliangshiyong,yibaohushengtaihuanjing。zongdelaishuo,hongguobujinjinshiyizhongmeiweideshuiguo,tahaichengzaizheyingyang、jingjiheshengtaidengduozhongjiazhi。zaizhuiqiukechixufazhandejintian,womenyinggengjiazhongshihongguodeduoyangxingyuqiqianzaideshehuijiazhi,tongguokexuedezhongzhiyuguanli,tuidonghong红(hong)果(guo),(,)作(zuo)为(wei)一(yi)种(zhong)广(guang)泛(fan)分(fen)布(bu)的(de)果(guo)实(shi),(,)承(cheng)载(zai)了(le)丰(feng)富(fu)的(de)文(wen)化(hua)与(yu)经(jing)济(ji)价(jia)值(zhi)。(。)然(ran)而(er),(,)在(zai)现(xian)代(dai)农(nong)业(ye)发(fa)展(zhan)与(yu)生(sheng)态(tai)保(bao)护(hu)的(de)背(bei)景(jing)下(xia),(,)我(wo)们(men)应(ying)该(gai)更(geng)深(shen)入(ru)地(di)探(tan)讨(tao)红(hong)果(guo)的(de)多(duo)重(zhong)意(yi)义(yi)与(yu)其(qi)在(zai)可(ke)持(chi)续(xu)发(fa)展(zhan)中(zhong)的(de)重(zhong)要(yao)性(xing)。(。)首(shou)先(xian),(,)红(hong)果(guo)的(de)营(ying)养(yang)价(jia)值(zhi)不(bu)容(rong)忽(hu)视(shi)。(。)以(yi)其(qi)丰(feng)富(fu)的(de)维(wei)生(sheng)素(su)、(、)矿(kuang)物(wu)质(zhi)和(he)抗(kang)氧(yang)化(hua)物(wu)质(zhi)著(zhu)称(cheng),(,)红(hong)果(guo)在(zai)促(cu)进(jin)人(ren)体(ti)健(jian)康(kang)方(fang)面(mian)发(fa)挥(hui)着(zhe)重(zhong)要(yao)作(zuo)用(yong)。(。)例(li)如(ru),(,)常(chang)见(jian)的(de)红(hong)果(guo)如(ru)樱(ying)桃(tao)、(、)红(hong)枣(zao)等(deng),(,)不(bu)仅(jin)味(wei)美(mei)可(ke)口(kou),(,)还(hai)能(neng)增(zeng)强(qiang)免(mian)疫(yi)力(li)、(、)改(gai)善(shan)肌(ji)肤(fu)。(。)这(zhe)使(shi)得(de)红(hong)果(guo)在(zai)现(xian)代(dai)人(ren)追(zhui)求(qiu)健(jian)康(kang)饮(yin)食(shi)的(de)潮(chao)流(liu)中(zhong),(,)成(cheng)为(wei)了(le)不(bu)可(ke)或(huo)缺(que)的(de)元(yuan)素(su)。(。)其(qi)次(ci),(,)红(hong)果(guo)的(de)经(jing)济(ji)价(jia)值(zhi)同(tong)样(yang)显(xian)著(zhu)。(。)随(sui)着(zhe)人(ren)们(men)对(dui)健(jian)康(kang)食(shi)品(pin)需(xu)求(qiu)的(de)增(zeng)加(jia),(,)红(hong)果(guo)的(de)市(shi)场(chang)需(xu)求(qiu)日(ri)益(yi)增(zeng)长(chang),(,)成(cheng)为(wei)农(nong)民(min)增(zeng)收(shou)的(de)重(zhong)要(yao)来(lai)源(yuan)。(。)例(li)如(ru),(,)在(zai)我(wo)国(guo)的(de)某(mou)些(xie)地(di)区(qu),(,)红(hong)果(guo)产(chan)业(ye)的(de)发(fa)展(zhan)带(dai)动(dong)了(le)乡(xiang)村(cun)经(jing)济(ji)的(de)转(zhuan)型(xing),(,)农(nong)民(min)通(tong)过(guo)种(zhong)植(zhi)红(hong)果(guo)实(shi)现(xian)了(le)增(zeng)产(chan)增(zeng)收(shou),(,)改(gai)善(shan)了(le)生(sheng)活(huo)水(shui)平(ping)。(。)因(yin)此(ci),(,)红(hong)果(guo)不(bu)仅(jin)是(shi)自(zi)然(ran)资(zi)源(yuan),(,)更(geng)是(shi)推(tui)动(dong)地(di)方(fang)经(jing)济(ji)发(fa)展(zhan)的(de)重(zhong)要(yao)动(dong)力(li)。(。)此(ci)外(wai),(,)红(hong)果(guo)的(de)种(zhong)植(zhi)与(yu)采(cai)摘(zhai)对(dui)生(sheng)态(tai)环(huan)境(jing)的(de)影(ying)响(xiang)也(ye)值(zhi)得(de)关(guan)注(zhu)。(。)合(he)理(li)的(de)红(hong)果(guo)种(zhong)植(zhi)模(mo)式(shi)可(ke)以(yi)促(cu)进(jin)生(sheng)物(wu)多(duo)样(yang)性(xing),(,)改(gai)善(shan)土(tu)壤(rang)质(zhi)量(liang),(,)减(jian)少(shao)病(bing)虫(chong)害(hai)的(de)发(fa)生(sheng),(,)形(xing)成(cheng)良(liang)性(xing)的(de)生(sheng)态(tai)循(xun)环(huan)。(。)我(wo)们(men)应(ying)倡(chang)导(dao)以(yi)可(ke)持(chi)续(xu)的(de)方(fang)式(shi)进(jin)行(xing)红(hong)果(guo)种(zhong)植(zhi),(,)避(bi)免(mian)农(nong)药(yao)和(he)化(hua)肥(fei)的(de)过(guo)量(liang)使(shi)用(yong),(,)以(yi)保(bao)护(hu)生(sheng)态(tai)环(huan)境(jing)。(。)总(zong)的(de)来(lai)说(shuo),(,)红(hong)果(guo)不(bu)仅(jin)仅(jin)是(shi)一(yi)种(zhong)美(mei)味(wei)的(de)水(shui)果(guo),(,)它(ta)还(hai)承(cheng)载(zai)着(zhe)营(ying)养(yang)、(、)经(jing)济(ji)和(he)生(sheng)态(tai)等(deng)多(duo)重(zhong)价(jia)值(zhi)。(。)在(zai)追(zhui)求(qiu)可(ke)持(chi)续(xu)发(fa)展(zhan)的(de)今(jin)天(tian),(,)我(wo)们(men)应(ying)更(geng)加(jia)重(zhong)视(shi)红(hong)果(guo)的(de)多(duo)样(yang)性(xing)与(yu)其(qi)潜(qian)在(zai)的(de)社(she)会(hui)价(jia)值(zhi),(,)通(tong)过(guo)科(ke)学(xue)的(de)种(zhong)植(zhi)与(yu)管(guan)理(li),(,)推(tui)动(dong)红(hong)