Cause dell'Occhio Secco
Dry eye is a debilitating eye disease affecting millions of people. There are many causes of dry eye. For example, lid margin disease such as blepharitis, preservatives in eye drops, allergy, contact lens wear, environmental factors, infection, eye surgery, oral medications, auto-immune diseases such rheumatoid arthritis and even hormonal imbalance can lead to changes to the tear film and surface of the eyes. Typically, the tear film becomes unstable and there is increased evaporation of the tears. This in turn, causes the tear film to become saltier. The increased saltiness causes damage to cells on the cornea and conjunctiva, signalling the eye to release pro-inflammatory chemicals which cause further damage to cells and reduce the stability of the tear film. Increased saltiness of the tears also causes changes to skin cells at the eyelid margin resulting in blockages to the meibomian glands. These glands produce important oils that reduce evaporation of the tears. Over time, blockages in the meibomian glands, cause the glands to shrink and reduce in number. Dry eye is a complex disease often requiring more than one treatment. These include drops, as well as in-practice treatments such as Intense pulsed light, that has been shown to effectively treat the many causes of dry eye.