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Biomechanical Instrumentation in Refractive Surgery

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Corneal Biomechanics and Refractive Surgery

Abstract

The determination of the intraocular pressure by means of instruments is still a developing science. Several physical properties and mechanisms affect this measure due to the corneal shape and its rigidity. Experimental and analytical researches are tools to improve indirect technologies (tonometric devices) for this relevant quantity for ophthalmologic diagnosis. In this chapter the applanation contact tonometry is the main subject (biomechanical modeling, computational modeling, and calibration equations); nevertheless, new tonometric devices tend to avoid contact to diminish influence of probe shape in the contact procedure and also pain in the patient.

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Author information

Authors and Affiliations

  1. Department of Bioengineering, Centro de Investigación de Métodos Computacionales (CIMEC), Predio CONICET-Santa Fe, Colectora Ruta Nac 168, Km 472, Paraje El Pozo, 3000, Santa Fe, Argentina

    Fabio A. Guarnieri Ph.D.

  2. Universidad del Norte, Barranquilla, Atlantico, Colombia

    Andrés Guzmán Ph.D.

Authors
  1. Fabio A. Guarnieri Ph.D.
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  2. Andrés Guzmán Ph.D.
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Correspondence to Fabio A. Guarnieri Ph.D. .

Editor information

Editors and Affiliations

  1. Department of Bioengineering, Centro de Investigación de Métodos Computacionales (CIMEC), Predio CONICET-Santa Fe, Colectora Ruta Nac 168, Km 472, Paraje El Pozo, 3000 Santa Fe, Santa Fe, Argentina

    Fabio A. Guarnieri

Glossary

CCT

Central corneal thickness

CH

Corneal hysteresis, a measure of viscoelasticity of the cornea (elasticity)

CRF

Corneal resistance factor

DCT

Dynamic contour tonometer

E

Linear elastic modulus (Young’s modulus)

ECR

External corneal radius

GAT

Goldmann applanation tonometer

ICR

Internal corneal radius

IOP

Intraocular pressure

IOPcc

IOP compensated for corneal effects

IOPg

Goldmann equivalent IOP

IOPt

Intraocular pressure measured by means of a tonometer

LCT

Limbal corneal thickness

PR

Poisson’s ratio

PT

Pneumotonometer

WS

Waveform score

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Guarnieri, F.A., Guzmán, A. (2015). Biomechanical Instrumentation in Refractive Surgery. In: Guarnieri, F. (eds) Corneal Biomechanics and Refractive Surgery. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1767-9_6

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  • DOI: https://doi.org/10.1007/978-1-4939-1767-9_6

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4939-1766-2

  • Online ISBN: 978-1-4939-1767-9

  • eBook Packages: MedicineMedicine (R0)

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