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

Accommodation-convergence relationships and age

A S Bruce1, D A Atchison, H Bhoola

  • 1Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia.

Investigative Ophthalmology & Visual Science
|February 1, 1995
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

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

Spectacle lens design: a review.

Applied optics·2010
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 journal

Impact of Subretinal Drusenoid Deposits on Ellipsoid Zone-Related Thickness Metrics.

Investigative ophthalmology & visual science·2026
Same journal

Proteomic Profiling of Optic Nerves From SMOX-Deficient Mice Identifies Regulators of Neuroinflammation and Axonal Damage in Optic Neuritis.

Investigative ophthalmology & visual science·2026
Same journal

Aflibercept and Faricimab Equipotently Restore Endothelial Barrier Function.

Investigative ophthalmology & visual science·2026
Same journal

Spatial Decomposition of Longitudinal RNFL Maps Reveals Distinct Modes of Glaucomatous Progression With Structure-Function and Genetic Signatures.

Investigative ophthalmology & visual science·2026
Same journal

The CXXC1-IGFBP6 Axis Maintains Corneal Epithelial Differentiation via H3K4me3-Dependent Transcriptional Activation.

Investigative ophthalmology & visual science·2026
Same journal

Archetypal Visual Field Analysis of Patients With Chronic Leber Hereditary Optic Neuropathy in Relation to Visual Recovery.

Investigative ophthalmology & visual science·2026
See all related articles

The accommodative-convergence/accommodation (AC/A) ratio increases with age, while the convergence-accommodation/convergence (CA/C) ratio decreases in adults aged 20-40. These changes may relate to presbyopia development.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Neuroscience

Background:

  • The relationship between accommodation and vergence is crucial for clear binocular vision.
  • Age-related changes in these systems may contribute to presbyopia.
  • Understanding these dynamics is key to diagnosing and managing visual disorders.

Purpose of the Study:

  • To investigate age-related differences in accommodative-convergence/accommodation (AC/A) and convergence-accommodation/convergence (CA/C) ratios.
  • To explore the potential link between these ratio changes and the development of presbyopia.
  • To analyze the relationship between AC/A and CA/C ratios across different age groups.

Main Methods:

  • Objective AC/A and CA/C ratios were measured in 23 healthy subjects aged 17-42.

Related Experiment Videos

  • Accommodation and convergence responses were stimulated using lenses and prisms.
  • Measurements were taken using an autorefractor and an eye movement monitor over two consecutive days.

    • Main Results:

    • A significant linear relationship was observed between AC/A ratio and age (P < .002).
    • A strong linear relationship was found between CA/C ratio and age (P < .0001).
    • The decrease in CA/C ratio was attributed to a reduced accommodative response to prisms (P = .0001).

    Conclusions:

    • AC/A ratio increases, while CA/C ratio decreases in individuals between 20 and 40 years old.
    • These findings suggest age-related alterations in the interplay between accommodation and vergence systems.
    • The observed changes may reflect adaptations in ciliary muscle function or vergence system adaptability with aging.