| Zugriffsnummer | 47862 |
| Dokumenttyp | Buchartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | New types of tonometer |
| Autor(in); Institution |
Draeger, J.; not affiliated
Jessen, Kai; PTB-Berlin
|
| Quelle/Jahr | Scientific foundations of ophtalmology:(1977), 243 - 251 |
| ISBN | 0-433-25015-1 |
| DOI | |
| Verlag | London: Heinemann |
| Zusammenfassung | This chapter describes the fundamental physical principles underlying the indirect determination of the intraocular pressure, that is, clinical tonometry. The chapter further reviews current clinical tonometry as represented by modern tonometers and discusses the new types of apparatus designed to determine the intraocular pressure by means of principles other than those previously used. All the indirect methods for determination of intraocular pressure depend on the deformation of the cornea. The chapter describes two basic principles: (1) the impression principle, whereby a plunger 3 mm in diameter deforms the cornea and the “indentation” is measured and (2) the applanation principle, whereby a plane surface is pressed against the cornea. It is then possible to measure either the pressure necessary to flatten a defined area or the size of the area flattened by a defined pressure. The chapter further discusses the existing tonometers based on these two principles and the recent tonometers based on some other principles. |
