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

Changes in astigmatism with accommodation.

Hema Radhakrishnan1, W Neil Charman

  • 1Faculty of Life Sciences, Moffat Building, University of Manchester, Manchester, UK. hema.radhakrishnan@manchester.ac.uk

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|May 2, 2007
PubMed
Summary
This summary is machine-generated.

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

Role of Ethnicity and Age in Corneal Curvature and Thickness Changes Following Corneal Cross-Linking for Keratoconus.

Translational vision science & technology·2026
Same author

Myopia control and modulation transfer functions for multisegment spectacle lenses.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2025
Same author

Students' and educators' perceptions of clinical academic pathways in the UK: a qualitative study.

BMJ open·2025
Same author

Oblique effects with multisegment spectacle lenses: 2. Ray tracing to determine power corrections.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2025
Same author

Oblique effects with multisegment spectacle lenses: 1. Images of a point object.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2025
Same author

Phoenix rising: Editing OPO, 1981-1987, volumes 1-7.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2025
Same journal

Mesopic Illumination in Natural Environments: Implications for Myopia Research.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same journal

Axial Length Growth Reference Curves and LMS Parameters for Japanese Children and Adolescents Aged 4-20 Years: The TMM BirThree Cohort Study.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same journal

Effect of Switching Myopia Control Strategies on Axial Elongation in Children with Poor Response to Highly Aspherical Lenslet Therapy.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same journal

Quantifying the Role of Longitudinal Chromatic Aberration and Age in Night Vision Disturbances.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same journal

Impaired Rod-Mediated Vision is the Functional Hallmark of Ageing and Early and Intermediate Age-Related Macular Degeneration.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same journal

Analytical Performance, Spatial Dynamics and Clinically Meaningful Change Thresholds for Automated Non-invasive Tear Film Assessment Using the Oculus Keratograph 5M.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
See all related articles

Ocular astigmatism shifts towards with-the-rule during accommodation in young adults. These changes may be linked to lens tilt, influenced by zonular laxity and gravity.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Astigmatism is a common refractive error affecting visual acuity.
  • Accommodation, the eye's ability to focus on near objects, can influence refractive state.
  • Previous research on astigmatism changes during accommodation is limited.

Purpose of the Study:

  • To investigate changes in ocular astigmatism during a 0-4 D accommodation stimulus range.
  • To determine the direction and magnitude of astigmatism shifts with accommodation.
  • To explore potential mechanisms underlying these astigmatic changes.

Main Methods:

  • Monocular observation of 31 healthy subjects (17-37 years) with horizontal visual axes.
  • Measurement of ocular astigmatism changes across a 0-4 D accommodation stimulus.

Related Experiment Videos

  • Subjects had initial astigmatism of 1.0 DC or less.

    • Main Results:

    • Most subjects exhibited a 'with-the-rule' shift in astigmatism during accommodation.
    • The mean astigmatic change was -0.036 DC at axis 176° per diopter of accommodation.
    • Individual variations in astigmatism change were observed.

    Conclusions:

    • Accommodation can induce significant changes in ocular astigmatism, predominantly in the with-the-rule direction.
    • These findings suggest that lens tilt, potentially due to zonular changes and gravity, may contribute to astigmatism shifts.
    • Further research is warranted to fully elucidate the mechanisms of accommodation-induced astigmatism.