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Title

惱人的乾眼症

Post Date
2008-05-30
Posting Unit
Ophthalmology Division
Content

惱人的乾眼症
近來門診有一個案例,她發現最近戴隱形眼鏡的時候常常看不太清楚,換上框式眼鏡就好了,覺得非常奇怪。回去眼鏡行檢查度數也沒問題,所以來問我是怎麼一回事。聽完她的故事,我馬上幫她做了淚液檢查,果然發現這是乾眼症在作祟。
大家也許覺得奇怪,乾眼症不就是淚水太少,眼睛感到乾澀的病,怎麼會看不清楚,又怎麼跟隱形眼鏡扯上關係呢?其實人的眼睛角膜上,覆蓋著約七微米的淚液層,別小看這薄薄的一層淚液,可是光線進入眼睛的第一道表面呢!所以淚液層必須完整,看東西才會清楚,若是因為乾眼症等原因,淚液層缺乏而不完整,當然會看不清楚。上述的案例就是有輕微的乾眼症,戴一般框式眼鏡還好,若戴上隱形眼鏡,把原有的少許淚液吸乾,就變成看不清楚了。
另外,由於眼淚減少時,會刺激角膜神經,使淚腺分泌較多淚液,有時反而造成流淚不止的症狀,也使得病人搞不清楚到底是不是乾眼症。其實這些都是乾眼症的症狀,在補充人工淚液及抑制乾燥造成的結膜發炎之後,都會得到不錯的緩解。對於較嚴重的病例,可以使用不含防腐劑之人工淚液,或是淚管塞等輔助治療,只要有耐心配合醫囑,通常都能享有舒適的雙眼及清晰的視野,要有信心喲!

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