Diagnosis of dry eye

Dry eye disease is characterized by symptoms, ocular surface damage, reduce d tear film stability, and tear hyperosmolarity. There are also inflammator y components. These features can be identified by various kinds of diagnost ic tests (symptom questionnaires, ocular surface staining, tear break-up ti me, and osmometry), although there may not be a direct correlation between the number or severity of symptoms and the degree of ocular surface damage or tear deficiency. Once the diagnosis of dry eye disease has been establis hed, further tests can be used to classify the condition into tear-deficien t or evaporative dry eye. The two forms of dry eye are not mutually exclusi ve and often co-exist. The optimal diagnosis of dry eye disease, therefore, depends on the results of several tests, and this article suggests an appr opriate order for performing these tests at a single clinic visit. (Surv Op hthalmol 45(Suppl 2):S221-S226, 2001. (C) 2001 by Elsevier Science Inc. All right reserved).