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

The 20-prism-dioptre base-out test: an indicator of peripheral binocularity

T Kaban1, K Smith, R Beldavs

  • 1Ivey Institute of Ophthalmology, Children's Hospital of Western Ontario, London.

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|August 1, 1995
PubMed
Summary

The 20-prism-dioptre base-out test effectively detects peripheral fusion in young children. A positive result indicates binocular single vision, crucial for diagnosing visual conditions in pre-verbal patients.

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

Adjunctive therapy in epilepsy: a cost-effectiveness comparison of two AEDs.

Seizure·1999
Same author

Traumatic rupture of the aortic arch treated by stent grafting.

European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery·1999
Same author

Characteristics of protein and energy metabolism in neonates with necrotizing enterocolitis--a pilot study.

Journal of pediatric surgery·1999
Same author

Children's Defense Fund focuses Congress on child care: both sides of the aisle submit proposals.

Pediatric nursing·1999
Same author

Electrophysiological evidence of cortical fusion in children with early-onset esotropia.

Investigative ophthalmology & visual science·1999
Same author

Adenosine and pediatric supraventricular tachycardia in the emergency department: multicenter study and review.

Annals of emergency medicine·1999

Area of Science:

  • Ophthalmology
  • Pediatric Vision
  • Binocular Vision

Background:

  • Assessing binocular vision in very young children is challenging due to limitations in formal sensory testing.
  • Peripheral fusion is a key component of binocular single vision, important for visual development.
  • Early detection of visual anomalies in children is critical for timely intervention.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of the 20-prism-dioptre (PD) base-out (BO) test for detecting peripheral fusion in pre-verbal children.
  • To determine the utility of the 20-PD BO test as a screening tool for binocular vision in pediatric patients.

Main Methods:

  • A case series design was employed at a pediatric ophthalmology service.
  • The study included 80 orthophoric children and 41 children with surgically corrected infantile esotropia, with a mean age of 19 and 21 months, respectively.

Related Experiment Videos

  • The 20-PD BO test and the red-green Worth four-dot test were administered at near distance.

    • Main Results:

    • The 20-PD BO test demonstrated a 100% positive predictive value in orthophoric children for detecting peripheral fusion.
    • In children with surgically corrected infantile esotropia, the positive predictive value was 93% (95% CI 82% to 100%).
    • The negative predictive value was 21% (95% CI 0% to 43%).

    Conclusions:

    • The 20-PD BO test is a valuable tool for identifying peripheral fusion in young children unable to complete standard sensory evaluations.
    • A positive response on the 20-PD BO test is a reliable indicator of peripheral binocular single vision in this age group.
    • Despite a low negative predictive value, the test aids in the assessment of binocular function in infants and toddlers.