老花

老花

甚麼是老花?

老花是一種常見的視力問題,通常始起於大約40歲,老花被定性為眼睛老化的表現,調節力出現問題,導致未能聚焦近距離景物

成因及風險因素

為何會有老花?

通常在40歲後,老花會伴隨年紀出現,因為晶體開始失去彈性,眼睛未能把光線準確聚焦在視網膜之上。眼睛老化還會使調節晶體的肌肉減少調節力,影響近距離物件的聚焦。在此情況下,光線會聚焦於視網膜之後,導致近距離景物模糊

但當你年輕時,晶體較柔軟及富彈性,容許眼睛內睫狀肌改變晶體形狀,從而準確聚焦不同距離物件。

易患上老花的人士?

35 歲以後,年紀增長會増加患上老花的可能性。隨著年齡增長,任何人皆有機會眼睛調節力下降,程度因人而異

老花會出現甚麼症狀?

部份老花可能出現的症狀包括:

  • 閱讀細字有困難
  • 要把閱讀資料放在較遠距離
  • 觀看太近距離物件時有困難
  • 頭痛
  • 眼睛易疲勞
老花和其他類型的屈光不正問題會否同時存在?

會,老花和其他類型的屈光不正問題會有機會同時存在。其他屈光不正問題包括:近視、遠視及散光。有些人的左右眼的屈光問題可能完全不相同

如何診斷患有老花?

眼科專業人員(例如:視光師 / 眼科醫生)可以透過屈光及全面眼睛檢查,準確診斷病人患有近視或其他屈光不正問題。時刻留意視力的變化,或有助偵查出其他眼睛健康問題,如發覺任何眼睛問題,請聯絡眼科專業人員作詳細檢查!

如何矯正老花?

驗配眼鏡是矯正老花最簡單,最安全的方法,老花專用眼鏡(例如:漸進 / 雙光鏡)在下光部份有較強的聚焦能力。這容許配戴者透過該部分作閱讀用途,而上光部份則用來觀看遠處景物


資料來源:美國國家眼科研究所

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