Clinical Research Directory

Inclusion criteria: * Cataract patients. * Cases within age \> 45 years old. Exclusion criteria: * Patients with ocular surface diseases and eyelid abnormality. * Patients receive ocular or systemic medications, that interfere with tear film production and stability (e.g. topical eye drops that contain preservatives, antihistaminic drugs, anticholinergic drugs, contraceptive pills). * Patients with systemic diseases like diabetes, HTN, rheumatoid arthritis. - Patients underwent previous ocular surgeries that interfere with tears instability or production (e.g. refractive surgery, keratoplasty, eyelid surgeries, pterygium excision). * Patients with a history of trauma, chemical burn, overusing contact lens (due to damaging the conjunctiva and the goblet cells, also corneal sensitivity reduction).