Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Theoretical principles of optical pachometry.

N A Brennan1, G Smith, J A Macdonald

  • 1Department of Optometry, University of Melbourne, Parkville, Australia.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 1, 1989
PubMed
Summary

This study presents new equations for optical measurement of corneal thickness using slit beam doubling. These equations offer a more accurate way to calculate true corneal thickness from apparent thickness measurements, improving pachometry accuracy.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Examining changes in neurofilament light chain following a behavioral weight loss intervention for adults with multiple sclerosis and obesity.

Multiple sclerosis and related disorders·2025
Same author

Body metrics are associated with clinical, free-living, and self-report measures of mobility in a cohort of adults with obesity and multiple sclerosis.

Multiple sclerosis and related disorders·2023
Same author

Patient function in serial assessments throughout the post-ACL reconstruction progression.

Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine·2020
Same author

Importance of reward and prefrontal circuitry in hunger and satiety: Prader-Willi syndrome vs simple obesity.

International journal of obesity (2005)·2011
Same author

Obese children show hyperactivation to food pictures in brain networks linked to motivation, reward and cognitive control.

International journal of obesity (2005)·2010
Same author

Analysis of tear film breakup on Etafilcon A hydrogel lenses.

Biomaterials·2001

Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Biomedical Optics

Background:

  • Optical pachometry, using slit beam doubling, is a common method for measuring corneal thickness.
  • Existing methods often assume specific angles for illumination and observation, limiting general applicability.
  • Accurate corneal thickness measurement is crucial for diagnosing and managing various eye conditions.

Purpose of the Study:

  • To develop a general set of equations for optical measurement of corneal thickness applicable to non-symmetrical illumination and observation angles.
  • To establish a method for calculating true corneal thickness from apparent thickness measurements in various pachometer configurations.
  • To provide a basis for uniform absolute derivations of corneal thickness and error estimation.

Main Methods:

Related Experiment Videos

  • Derivation of a general set of equations for optical corneal thickness measurement.
  • Application of an iterative procedure to establish relationships between true and apparent corneal thickness for different configurations.
  • Development of a linear approximation relating the inverse of true thickness to the inverse of apparent thickness.
  • Derivation of an equation for peripheral corneal thickness measurement.

Main Results:

  • An explicit solution for true corneal thickness is not feasible; an iterative approach is necessary.
  • Near-linear relationships were found, leading to a linear approximation for inverse thickness values.
  • A general equation for optical pachometry applicable to various configurations was developed.
  • An equation for peripheral corneal thickness measurement was derived.

Conclusions:

  • The derived equations provide a general framework for optical pachometry, accommodating diverse configurations and angles.
  • The findings facilitate more accurate corneal thickness measurements and better estimation of pachometry errors.
  • This work supports uniform absolute derivations of corneal thickness, enhancing clinical and research applications.