Abstract
For clear vision, the cornea, which is not supplied with blood, has to be continually kept wet and it is done by basal tears. Tears are the maintenance fluid of the eye; the watery eyes or epiphora is the most common symptoms of many ocular pathologies; this is due to either overproduction or under drainage of tears. The watery eyes may also be due to hyperlacrimation. Tears play an important role in producing and controlling these ocular pathologies.
Highlights
Life cannot exist without water; every organ in human body is kept moist by blood
It is essential for many reasons to keep mammalian eyes wet; the outermost layer, the cornea, which is not supplied with blood, has to be continually kept wet for clear vision and it is done by basal tears
Though most cases of epiphora are due to non-patency in the lacrimal outflow pathway, others, such as eyelid and adnexal disorders, and corneal and ocular surface pathologies, can cause watering [4]
Summary
Life cannot exist without water; every organ in human body is kept moist by blood. The blood plasma contains 90 percent water. In addition to the tears eye lashes play pivotal role to keep the cornea wet [2, 3] Further the both anterior and posterior chambers are filled with a clear, watery fluid called aqueous humor or vitreous gel. Instead of blood this fluid tak the most common cause of watering eyes among adults and older children is the blocked tear ducts or ducts that are too narrow (Fig. 1). If the tear ducts are narrowed or blocked, the tears will not be able to drain away and will build up in the tear sac It can cause excessive tearing, recurrent conjunctivitis (eye inflammation) or dacryocystitis (eye infection), painful swelling, mucus discharge and blurred vision [4,5,6]. In addition to excessive tearing, symptoms of dry eye syndrome may include blurred vision, itchy or burning eyes
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