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眼球裡有兩個充滿液體的腔室。眼球內液或稱眼液,負責維持適當的眼內壓,保持完整的眼球形狀。眼球前房內所含的液體,清澈如水。至於較大的後房,則充滿黏稠的膠狀液體,稱為玻璃狀液。 前房內清澈如水的眼液稱為水樣液,在眼球內流動,並源源不斷地形成與吸收。水樣液在水晶體附近形成,流入眼球前房,然後經過一條小導管,進入靜脈系統。 青光眼為導致失明的常見原因,是影響水樣液排放,導致眼內壓升高的疾病。青光眼有許多類型和病因。通常當過濾眼液的海綿樣網狀物變得緊密,阻礙眼液進入導管,或眼球虹膜蓋住導管開口時,就會造成青光眼。 不論病因如何,眼球內出現液體積聚,會產生壓力推擠眼球後方,並使視神經受損。視神經負責將影像傳送到大腦。隨著時間推移,升高的壓力會導致視野內出現盲點甚至全盲。適當的治療可阻止或減緩病程進展,但無法恢復已喪失的視覺。
Duration: 01:42
Published: 2016/2/25
Blausen Medical
Scientific and Medical Animations
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