What we normally know as the tear film actually consists of a film that covers, moisturizes, lubricates and nourishes the cornea and conjunctival sac. It is formed by 3 layers joined together, of which the outer and thinnest one contains oils produced in the lipid glands located in the eyelids, whosepurpose is to lubricate and prevent evaporation of the middle layer that is water and corresponds to the 90% of the tear film and whose function is to bring oxygen and various nutrients to the cornea. The third one is the mucous layer that lubricates and joins the aqueous layer of the cornea and it is formed by the cells of the conjunctiva.
A deficiency of any of these components can cause dry eye due to the instability of the film’s equilibrium. The tear film also has a special optical function, so its absence causes significant negative effects on a pet’s vision.
Inflammation or atrophy of the lacrimal glands leads to the reduction or cessation of the aqueous secretion of the tear, and is most often the cause of dry Keratoconjunctivitis.
What is worst about this disease is that it causes blindness in a short period of time, not by the suffering of internal problems of the vision, but by the loss of corneal transparency, or even worse, ulceration and corneal perforation due to dryness.
Upon any sign of discomfort in your pet’s eyes, it is advisable to visit the ophthalmology clinic for a quick and accurate diagnosis and subsequent treatment.
