The authors aimed to determine near point of convergence (NPC) values in a population-based study in Iranian schoolchildren with a large sample size. They explored its relation to factors such as age, gender, refractive error and near point of accommodation. Of 5620 subjects aged 6 to 12 years, 5444 had relevant data. Mean age was 9.24±1.71 years; 53.6% were male. Mean NPC was 8.08cms (CI 7.96-8.19). A significant positive correlation was between NPC and near point accommodation (NPA) along with significant associations for NPC and age, spherical equivalent refraction and NPA. NPC values were lower than two other population samples and reasons may be the different targets used (with / without accommodative cues) and racial differences. Myopes had the least remote and hyperopes had the most remote NPC values.
Iranian values for childhood convergence
Reviewed by Fiona Rowe
Near point of convergence in Iranian schoolchildren; normative values and associated factors.
Fiona Rowe (Prof)
Institute of Population Health, University of Liverpool, UK.View Full Profile