什麼是乾眼症

從了解乾眼症開始

什麼是乾眼症?

乾眼症是常見的眼科疾病,指淚液的薄膜不足以使眼球表面維持濕潤而導致眼睛乾燥、不適的情形。
乾眼症的成因可分為兩大類:

淚液分泌不足

淚液蒸發過多

乾眼症的發生原因

淚液分泌不足的原因
  • 年紀增加
  • 因發炎或外傷導致淚腺受損
  • 自體免疫疾病引起之症狀
    如:類風濕性關節炎、乾燥症候群等
  • 服用某些藥物
    如:某些抗高血壓藥、抗憂鬱藥等
  • 眼睛相關手術
淚液蒸發過多的原因
  • 長期處於強風、濃煙、高溫、乾燥空氣的工作環境
  • 瞼板腺功能異常或分泌不足
  • 眼瞼閉合不全
  • 眨眼次數減少
    如:長時間開車、閱讀、螢幕觀看時間過長

淚液生成相關構造

淚膜為覆蓋眼球表面的液體薄膜,淚膜共有三層:油層、水層與黏液層,分別由眼周附近不同腺體所分泌而成。
*眼睛表面或腺體的任何一處發生問題,都有可能導致乾眼症。

淚液共有三層:油層、水層與黏液層,分別由眼周附近不同腺體所分泌而成。常見「水層分泌不足」及油層因「瞼板線組塞」,建議可以多加人工淚液滋潤,以及評估脈衝光治療。

 

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