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2. Dry eye syndrome - Wikipedia

   en.wikipedia.org/wiki/Dry_eye_syndrome

   Dry eye syndrome can lead to blurred vision, instability of the tear film, increased risk of damage to the ocular surface such as scarring of the cornea, and changes in the eye including the neurosensory system. [2] [6] Dry eye occurs when either the eye does not produce enough tears or when the tears evaporate too quickly. [2]

3. Schirmer's test - Wikipedia

   en.wikipedia.org/wiki/Schirmer's_test

   Schirmer's test determines whether the eye produces enough tears to keep it moist. This test is used when a person experiences very dry eyes or excessive watering of the eyes. It can cause damage to the cornea. [1] A negative (more than 10 mm of moisture on the filter paper in 5 minutes) test result is normal.

4. Tear break-up time - Wikipedia

   en.wikipedia.org/wiki/Tear_break-up_time

   Tear break-up time (TBUT) also known as tear film break-up time (TFBUT) is the time taken for the first dry spot to appear on the cornea after a complete blink. TFBUT measurement is an easy and fast method used to assess the stability of tear film. It is a standard diagnostic procedure in the dry eye clinics. [1]

5. Artificial tears - Wikipedia

   en.wikipedia.org/wiki/Artificial_tears

   Artificial tears are lubricating eye drops used to relieve dryness and irritation of the ocular surface. [1] Dry eye syndrome (keratoconjunctivitis sicca) is a common ocular surface disorder and is characterized by disruption of the tear film and increased inflammation.

6. Lacrimal gland - Wikipedia

   en.wikipedia.org/wiki/Lacrimal_gland

   In contrast to the normal moisture of the eyes or even crying, there can be persistent dryness, scratching, itchiness and burning in the eyes, which are signs of dry eye syndrome (DES) or keratoconjunctivitis sicca (KCS). With this syndrome, the lacrimal glands produce less lacrimal fluid, which mainly occurs with aging or certain medications.

7. Conjunctivochalasis - Wikipedia

   en.wikipedia.org/wiki/Conjunctivochalasis

   Conjunctivochalasis, also known as mechanical dry eye (MDE), is a common eye surface condition characterized by the presence of excess folds of the conjunctiva located between the globe of the eye and the eyelid margin.