The spectacles are used in:

The image shows bifocal glasses of executive type which is especially used in case of paediatric pseudophakia and not in adult aphakia or presbyopia. Other types of bifocals are K or D bifocals which are used for adults with presbyopia Progressive glasses avoid the sudden jump in power in the lenses and provide a smooth transition from the power for distance vision to the power for the near vision thereby providing good distance, intermediate and near vision