Inclusion Criteria:  Eyes with pre-existing dry eye and visually significant cataract planned for phacoemulsification Patients aged18years or older and in good general health Mild to moderate dry eye; non-visually significant ocular surface disease (NVS-OSD) defined as Corneal Fluorescein Staining (CFS) score of <3 on the Oxford scale Tear break-up time (TBUT) <10 seconds  Exclusion Criteria:  Eyes with complications after cataract surgery which require a prolonged course of topical medication Eyes with history of contact lens wear in the previous 3 months Eyes with history of regular use of topical eye drops(except artificial tears) in the previous 6 months Treatment history of dry eye beyond artificial tears Eyes with significant ocular surface disease (defined as CFS score of ≥3 on the Oxford scale) Eyes with lacrimal or eyelid disease or ocular surface infections Any ocular surgery within the prior 6 months Using medications that could affect the dry eye condition (eg, antihistamines, antidepressants, decongestants, anticholinergic drugs or hormone treatment) Allergies to Diquafosol