The spectacles are used in:
Progressive glasses for presbyopia
Bifocal glasses for presbyopia
Bifocals for pediatric pseudophakia
Bifocals for adult aphakia
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