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Dry eye

Etiology :
Aqueous tear deficiency

Mucin deficiency

Lipid deficiency and abnormalities

Impaired eyelid function


Tear film tests :

Tear film break up time (BUT: It is the interval between complete blink and appearance of first randomly distributed dry spot on the cornea

Schirmer's I test : with 5 x 35 mm strip of Whatman-41 filter paper

Rose Bengal staining :
C pattern : mild cases with punctuate stains
B pattern : moderate cases with extensive staining
A pattern : severe cases with confluent staining of conjunctiva and cornea

Other tests include tear osmolarity, tear levels of lysozyme and lactoferrin and conjunctival impression cytology

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