Dry eyes can be caused by many things, including environmental factors such as very bright sunlight, acrid exhaust fumes, airborne pollen and dust, or working at a computer monitor. Convertible drivers and cyclists are also often affected because of the wind blowing against them. You may also encounter causes of dry eyes on holiday, as most swimming pools in holiday areas have high chlorine content and irritate the eye's sensitive conjunctiva.
However, dry eyes can also be caused by medicines such as antidepressants or beta blockers. Also, women going through menopause are very frequently affected, because hormonal changes can cause their tear fluid to dry up.
And last but not least, improperly treated vision problems can also be a cause of dry eyes, since the eyes are more easily overstrained. Regular vision checks from an optician or an eye care professional can quickly provide clarity.