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

Apparent pupil displacement in videokeratography

R B Mandell1

  • 1School of Optometry, University of California, Berkeley 94720.

The CLAO Journal : Official Publication of the Contact Lens Association of Ophthalmologists, Inc
|April 1, 1994
PubMed
Summary

Videokeratography can show a pupil position shift up to 0.5 mm due to alignment, primarily influenced by the angle lambda. This finding suggests using the line of sight as the main reference for refractive surgery.

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

Allele-specific alien-driven diversity, immune responsiveness and MHC-restriction.

Immunology today·2014
Same author

Virus-like particle-based countermeasures against Rift Valley fever virus.

Zoonoses and public health·2012
Same author

Comments on measuring the contour of the cornea.

Applied optics·2010
Same author

The αGal HyperAcute(®) Technology: enhancing immunogenicity of antiviral vaccines by exploiting the natural αGal-mediated zoonotic blockade.

Zoonoses and public health·2009
Same author

Measurement of post-lens tear thickness.

Investigative ophthalmology & visual science·1999
Same author

Radioisotope concentrator gene therapy using the sodium/iodide symporter gene.

Cancer research·1999

Area of Science:

  • Ophthalmology
  • Optometry
  • Optical Engineering

Background:

  • Videokeratography is a common tool for corneal topography.
  • Accurate pupil positioning is crucial for refractive surgery and visual assessment.

Purpose of the Study:

  • To investigate the cause and implications of apparent entrance pupil displacement in videokeratography.
  • To determine the optimal reference axis for videokeratography and refractive surgery.

Main Methods:

  • Analysis of videokeratography data from multiple commercial devices.
  • Correlation of pupil displacement with ocular parameters like angle lambda and pupil decentration.

Main Results:

  • Apparent entrance pupil displacement up to 0.5 mm was observed in videokeratography.

Related Experiment Videos

  • This displacement is mainly caused by the alignment system and angle lambda, not corneal shape.
  • Nasal pupil decentration reduces the observed displacement.

    • Conclusions:

    • The line of sight is a more appropriate reference axis for videokeratography and refractive surgery than the vertex normal or visual axis.
    • Understanding pupil displacement is critical for accurate refractive surgery planning and outcomes.