To estimate the frequency of convergence insufficiency (Cl) and its related characteristics among 8-to 12-year-old children randomly selected from 2 optometry clinic populations.
Clinic records of 620 children were randomly selected and reviewed according to a standard protocol, using a systematic sampling method based on the total number of 8-to 12-year-old children seen over a 1-year period at 2 optometry clinics.
Records were reviewed for demographic and clinical data.
Data on Cl-related symptoms were obtained at one of the sites.
Records that met the eligibility criteria of :
good visual acuity (20/30 or better in both eyes) ;
minimal refractive error (-0.50 to+1.00 D and<1.00 D of astigmatism in either eye, and ¾1.00 D of anisometropia) ;
and no strabismus were evaluated for Cl-related characteristics.
Eligible children were classified according to the direction of their near heterophoria and the number of the following clinical signs present :
(1) exophoria at near =4 delta than at far ;
(2) insufficient fusional convergence [i.e., failing Sheard's criterion or minimum normative positive fusional vergence (PFV) of 12 delta base-out (BO) blur/15 delta BO break] ;
and (3) receded nearpoint of convergence (NPC) of =7.5 cm break or =10.5 cm recovery. (...)
Mots-clés Pascal : Exophorie, Classification, Symptomatologie, Lecture, Distribution, Epidémiologie, New York, Etats Unis, Amérique du Nord, Amérique, Enfant, Homme, Oeil pathologie, Oculomotricité syndrome, Strabisme
Mots-clés Pascal anglais : Exophoria, Classification, Symptomatology, Reading, Distribution, Epidemiology, New York, United States, North America, America, Child, Human, Eye disease, Oculomotor syndrome, Strabismus
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0154501
Code Inist : 002B02M. Création : 21/07/1998.