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Fundamental principals and applied biophysics
Author(s) -
MarquesNeves C.
Publication year - 2016
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2016.0144
Subject(s) - cornea , elasticity (physics) , pascal (unit) , optics , materials science , biomedical engineering , physics , engineering , composite material , thermodynamics
Summary Pascal tonometry is a pressure sensor, made by a piezoresistive mycrocristal mounted on a concave tonometer, thus allowing a minimal contact with the anterior surface of the cornea. This design is meant to minimize the impact of the corneal components in the measurement of the transmural pressure. Carrying a weight of approximately 1 g, the tonometer itself has 7 mm in diameter with the crystal occupying the central 1.2 mm. Its 100 Hz reading rate allows a continuous pressure measurement which can be influenced by a number of variables ranging from axial length, to corneal elasticity.