Proposed Study Title: Prevalence of Different Etiologies of Ocular Dryness in Patients Previously Diagnosed with Dry Eye

Dry eye disease (DED) is a common chronic multifactorial condition of the ocular surface characterized by failure to produce high quality or sufficient amounts of tears to moisturize the eyes (1) DED can be categorized as "dry eye with reduced tear production (aqueous deficient) and dry eye with increased evaporation of the tear film known as the hyperevaporative type… Although 10% of individuals have aqueous deficient DED, more than 80% have either the hyperevaporative type related to meibomian gland dysfunction (MGD), or a combination of

Inclusion Criteria:

• Egyptian people between 20 and 70 years old coming to outpatient clinic BUT< 10 seconds.. No previous surgery. No previous trauma. Not using eye drops in the last 3 months.

Exclusion Criteria:

Diabetic patients. Patients with rheumatological diseases that may affect ocular surface as RA.

Egyptian people between 20 and 70 years old coming to outpatient clinic BUT< 10 seconds.. No previous surgery. No previous trauma. Not using eye drops in the last 3 months.

Study will be in6 months