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id="tmyyfroktkho" class="fl arc_btn"></span> </div> </div> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("title");</script></div> <div id="tmyyfroktkho" class="con_article con_main" id="contentText"> <p> 　　老花眼即老視是一種生理現(xiàn)象，不是病理狀態(tài)也不屬于屈光不正，是人們步入中老年后必然出現(xiàn)的視覺問題。是身體開始衰老的信號之一。</p><p><strong>　　老花眼是什么原因?qū)е碌?/strong></p><p> 　　所謂“老花眼”是指上了年紀(jì)的人，逐漸產(chǎn)生近距離閱讀或工作困難的情況。這是人體機能老化的一種現(xiàn)象。本病是指40歲以上，視遠尚清，視近模糊的眼病，相當(dāng)于西醫(yī)學(xué)的老視，是人體衰老變化的一種表現(xiàn)，由于年齡增加而導(dǎo)致晶珠調(diào)節(jié)力減弱而發(fā)生的近視力下降。</p><p> 　　老視的程度與年齡的大小有一定的規(guī)律，但遠視眼患者，老花眼出現(xiàn)要比正常眼為早，而近視眼患者出現(xiàn)此癥要比正視眼晚些，或終身不用老花鏡。老花眼醫(yī)學(xué)上又稱老視，多見于40歲以上，晶狀體硬化，彈性減弱，睫狀肌收縮能力降低而致調(diào)節(jié)減退，近點遠移，故發(fā)生近距離視物困難.這種現(xiàn)象稱為老視.絕大多數(shù)的人在40～45歲左右眼睛會悄悄出現(xiàn)“老花”，首先感到看細小字跡模糊不清，必須要將書本、報紙拿遠才能看清上面的字跡。其實，老花眼是人體生理上的一種正?，F(xiàn)象，是身體開始衰老的信號。</p><p> 　　隨著年齡增長，眼球晶狀體逐漸硬化、增厚，而且眼部肌肉的調(diào)節(jié)能力也隨之減退，導(dǎo)致變焦能力降低。因此，當(dāng)看近物時，由于影像投射在視網(wǎng)膜時無法完全聚焦，看近距離的物件就會變得模糊不清。即使注意保護眼睛，眼睛老花的度數(shù)也會隨著年齡增長而增加，一般是按照每5年加深50度的速度遞增。根據(jù)年齡和眼睛老花度數(shù)的對應(yīng)表，大多數(shù)本身眼睛屈光狀況良好，也就是無近視、遠視的人，45歲時眼睛老花度數(shù)通常為100度，55歲提高到200度，到了60歲左右，度數(shù)會增至250度到300度，此后眼睛老花度數(shù)一般不再加深。</p><p> 　　老花眼常被當(dāng)成年老的標(biāo)志，不少四十剛出頭的人老花之后，因為不服老而硬撐著不肯戴老花鏡來矯正視力，這樣反而加重眼睛負擔(dān)。老花眼如果不戴眼鏡，即使勉強看清近方目標(biāo)，也會由于強行調(diào)節(jié)、睫狀肌過度收縮，產(chǎn)生種種眼睛疲勞現(xiàn)象，如頭痛、眉緊、眼痛、視物模糊等視力疲勞癥狀。戴老花鏡也大有學(xué)問，必須經(jīng)過準(zhǔn)確的驗光再配鏡，而且每5年還要重新驗光、配鏡，否則戴了不合適的眼鏡，只會適得其反，甚至還會掩蓋一些眼病，如白內(nèi)障、糖尿病在眼部的表現(xiàn)等等?，F(xiàn)代老花眼鏡多采用漸進式鏡片，鏡片共分三部分，上方看遠物(上光區(qū))，下方位置看近距離(近光區(qū))，中間部分(中光區(qū))用來看中距離的物件，三個光區(qū)之間會隨著度數(shù)深淺而呈漸進式變化，從而調(diào)節(jié)看各種距離的物體，戴上它既可近瞧也可遠看。眼花后絕不能遇見賣老花鏡的就隨意掏錢買下，其實，這些傳統(tǒng)的老花鏡只用來幫助“近瞧”，遠望時絕不能戴。</p><p> 　　老花眼又稱“視敏度功能衰退癥”，最直接表現(xiàn)為近距離閱讀模糊、疲勞、酸脹、多淚、畏光、干澀及伴生頭痛等癥狀。中老年人常說的“四十七八，兩眼花花”，“眼力差多了”、“眼神不濟了”都屬老花眼典型癥狀。大幅度降低工作效率，是這個病的最大禍害。和許多慢性病一樣，初期老花眼往往得不到應(yīng)有重視，發(fā)展成白內(nèi)障、視力急衰癥等嚴(yán)重疾病后才去治療，增加了治愈難度。</p> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("conten");</script></div> <div id="tmyyfroktkho" class="pnum"> <ul id="page_slice"> <div id="tmyyfroktkho" class="clear"></div> </ul> </div> <a href="/lhdoc/index.html?url=//m.rzpgrj.com/yuanyin/229722.html" class="download_word download_word_lb" title="文檔下載" target="_blank"> <div id="tmyyfroktkho" class="download_card"> <div id="tmyyfroktkho" class="card_nr card_nr_lb"> <h4 class="card_bt">老花眼是什么原因?qū)е碌?/h4> <div id="tmyyfroktkho" class="download_card_msg">老花眼即老視是一種生理現(xiàn)象，不是病理狀態(tài)也不屬于屈光不正，是人們步入中老年后必然出現(xiàn)的視覺問題。是身體開始衰老的信號之一。老花眼是什么原因?qū)е碌?所謂老花眼是指上了年紀(jì)的人，逐漸產(chǎn)生近距離閱讀或工作困難的情況。這是人體</div> </div> <div id="tmyyfroktkho" class="download_card_btn download_card_btn_lb"> <div id="tmyyfroktkho" 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