Dryness Difference Between Before and After Phacoemulsification

Who May Qualify: - Cataract patients. - Cases within age \> 45 years old. Who Should NOT Join This Trial: - 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). Always talk to your doctor about whether this trial is right for you.