Your mother has been implanted monofocal lens in one eye for distance, now she can see distance clearly without glass  &will need eyeglass for near from operated eye & in 2nd eye  she should be made slightly myopic so that she would be able to see mobile no. etc without glass, she must be implanted monofocal &should be slightly over corrected because if she is not carrying eyeglass  in market she will able to see price printed on the packet .Your mother is diabetic ,so I think acryosof single piece by ALCON  will be best &I am implanting it in diabetic patients since 20 yrs without any problems, you should  never go for multi focal lens in 2nd eye ,with regards