Dehydration: It is not only our skin and organs get de-hydrated but our eyes are affected also.
Ageing: One of the most common reasons for dryness is associated with the natural ageing process. As we get older our bodies produce less oils, including the oily outer layer of the tear film. This oily layer forms a protective coating over the tears and stops them from evaporating. A deficiency in this protective layer allows tears to evaporate and leaves areas of exposure on the surface of the eye.
Medications: Certain medications can influence the quantity / quality of tears produced eg Beta blockers,contraceptive pill,sleeping tablets and many more.
Medical conditions may also cause dry eye including: Thyroid conditions, Rheumatic or internal disorders such as Polyarthritis, Diabetis,Lupus, Parkinson’s Disease, and Sjogren’s Syndrome,Hormonal changes eg menoupause,Neuroparalysis(stroke)
Contact lens wear can heighten dryness symptoms, as often water-based lenses will absorb moisture from the tear film, reducing the quantity of tears remaining.
VDU Work: People working on VDUs may find they experience dryness symptoms specifically at work. It has been reported that people working on VDUs for long periods at a time tend to blink less often. This allows tears to evaporate more readily.
Malnutrition:A good balanced diet with omega-3s.
Chronic use of vaso-constricting eye drops.
Lid Disease:Blepharitis of the lids is a cause of tear problems.