The natural moisturising agent not eh eye contains 3 layers; mucous, tears & oil. When there is a deficiency in any of the layers, it causes dry eye. Dry eye can be classified into two groups: Evaporative and Aqueous Deficiency
Evaporative Dry Eye
Evaporative dry eye is caused when there is insufficient oils protecting the tears from evaporating. The oils are produced from the eye lids and can get blocked over time. Treating evaporative dry eye involves unblocking the glands so more oils can be secreted onto the eye.
This occurs when there is a reduced production of tears usually from an auto immune disease such as Sjrogrens. The common treatment for this are punctual plugs to prevent the drainage of tears and allowing them to stay on the eye.
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Meibomian gland expression