ackground: Cataract and glaucoma are both common conditions and are often present in the same patient. The incidence of these diseases increases with age. Besides vision impairment, these diseases are associated with decrement in quality of life (QOL). Objective: To study the effect of cataract surgery on Central Corneal Thickness and Visual Fields in glaucomatous and non-glaucomatous eyes. Materials and Methods: We enrolled 60 patients with glaucoma and concomitant cataract (Group A) and 60 patients with only cataract (Group B) scheduled for phacoemulsification cataract surgery. A record was made which included number of anti-glaucoma medications, visual acuity (VA), intra-ocular pressure (IOP), Central corneal thickness (CCT), visual field (VF) analysis: mean deviation (MD) and pattern standard deviation (PSD). The patients were re-evaluated at 1st week,4th week and 3rd month after cataract extraction and the above parameters were again obtained to compare them with the baseline values.