It is nothing but a symptom complex occuring as a sequale to deficiency or abnormality of tear film.
Etiology: 1.Aqueous layer deficiency
2.Mucin deficiency
3.Lipid abnormality
4.Impaired eye lid function
5.Epitheliopathies
Symptoms: irritation,foriegn body sensation,dryness,etc
Signs: Stingy mucous,lusterless ocular surface,corneal inflammation,etc
Tests: Tearfilm Braekup test, Schirmer I test,Rose bengal staining,etc
Treatment:Tear substitutes, topical cyclosporines,topical retinoids, mucolitics,redusing evapourisation and drainage.
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