**3. Diagnosis and ancillary testing**

## **3.1 Aim**

Investigations of DED are set with following goals -.

a.To confirm the clinical diagnosis of DED.

b.To quantify the DED.

Various tests have been devised to diagnose DED but no test can singly give you a diagnosis of DED. The correct way to diagnose DED it to correlate between the signs and symptoms of patients and the investigations planned.
