First you should get your father's blood
sugar controlled at normal level at time if surgery because diabetic patients are more prone to infection. You should go for phaco-emulsification with foldable lens ( my choice in this case will be acryosof single piece IQ ALCON) having 20 yrs experience with these lens for
diabetes patient, do not go multi focal lens ,expenditure around rs30000 but not in five star hospital, with regards