1. Bland JM, Altman DG (1986) Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1:307–310
2. Digital mobile tonometer for measurement of intraocular pressure through the eyelid: TGDc-01 “PRA”. Instruction booklet, Rjazan State Toolmaking Plant, 32 Kaljaeva Street, 390000 Rjazan, Russia
3. Draeger J, Stodtmeister R (2003) Ein “neues” Tonometer? Augenarzt 37:318–319
4. Mantha S, Roizen MF, Fleisher LA, Thisted R, Foss J (2000) Comparing methods of clinical measurements: reporting standards for Bland and Altman analysis. Anesth Analg 90:593–602
5. Martin M, Pache M, Flammer J (2003) Der portable Tonometer TGDc-01 und die Goldmann- und Lufttonometrie im Vergleich - eine Pilotstudie. In: Auffarth GU, Welt R, Demeler U (eds) Transactions, 17th Congress of the German Society for Intraocular Lens Implantation and Refractive Surgery (DGII). Biermann, Cologne, pp 126–130