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

Intraoperative semiquantitative keratometry using the keratoscopic astigmatic ruler

N Morlet1, P A Lindsay

  • 1Department of Ophthalmology, University of New South Wales, Australia.

Journal of Cataract and Refractive Surgery
|November 1, 1995
PubMed
Summary

A new keratoscopic astigmatic ruler accurately measures corneal astigmatism during surgery. This handheld device ensures correct measurement distance, improving surgical outcomes for astigmatism correction.

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

Hospital cataract surgery volume and postoperative endophthalmitis.

Eye (London, England)·2007
Same author

Blepharokeratoconjunctivitis in children: diagnosis and treatment.

The British journal of ophthalmology·2005
Same author

Microbial keratitis: what's the preferred initial therapy?

The British journal of ophthalmology·2003
Same author

Microbial keratitis: what's the preferred initial therapy? View 2: Empirical fluoroquinolone therapy is sufficient initial treatment.

The British journal of ophthalmology·2003
Same author

The Endophthalmitis Population Study of Western Australia (EPSWA): first report.

The British journal of ophthalmology·2003
Same author

Astigmatism and the analysis of its surgical correction.

The British journal of ophthalmology·2002

Area of Science:

  • Ophthalmology
  • Optics
  • Medical Devices

Background:

  • Intraoperative keratometry is crucial for managing corneal astigmatism via suture tension.
  • Hand-held keratometers risk errors due to variable measurement distances affecting image shape.
  • Accurate measurement requires maintaining a calibrated distance from the astigmatic cornea.

Purpose of the Study:

  • To design and evaluate a novel hand-held keratometer for assessing corneal astigmatism magnitude.
  • To improve the accuracy of intraoperative astigmatism measurement.
  • To provide surgeons with a reliable tool for surgical decision-making.

Main Methods:

  • Development of the keratoscopic astigmatic ruler, a hand-held device with a rack of elliptical keratoscopic lenses.

Related Experiment Videos

  • The device uses inexpensive, autoclavable, injection-molded plastic.
  • Incorporation of a sight mechanism to ensure correct measurement distance and a bright corneal reflection.

    • Main Results:

    • The keratoscopic astigmatic ruler generates a clear aerial image above the cornea.
    • The design facilitates easy determination of corneal reflection for astigmatism assessment.
    • The integrated sight aids in maintaining the calibrated distance for accurate measurements.

    Conclusions:

    • The keratoscopic astigmatic ruler is an effective tool for measuring corneal astigmatism intraoperatively.
    • Its design addresses the distance-dependent error inherent in traditional hand-held keratometers.
    • This device offers a simple, accurate, and cost-effective solution for ophthalmic surgeons.