What is it about?
The near point of convergence (NPC) for children was investigated using an objective push-up convergence pursuit test. NPC increased significantly with age. NPC tends to decrease with age in children between the ages of 2 and 17. The occurrence of an NPC of more than 5 cm was not seen until children were over 8 years of age.
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Why is it important?
Healthy binocular vision produces important visual perceptual skills which are part of normal human vision: binocular depth perception and stereopsis. NPC is the distance before which an object will not be in focus for two eyes without appearing as a double image and is an important aspect of binocular vision. A significant age trend for the NPC breakpoint was found where kindergarten children showed better NPC breaks than those of third-grade children or sixth-grade children. This study investigated the age effect on the NPC in children from 2 years old and up to establish the normative value of the NPC in children, especially pre-school children.
Read the Original
This page is a summary of: Near visual function in young children. Part I: near point of convergence. Part II: amplitude of accommodation. Part III: near heterophoria, Ophthalmic and Physiological Optics, May 2000, Wiley, DOI: 10.1046/j.1475-1313.2000.00498.x.
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