Standard single vision lenses only consider the prescription for the wearer’s far vision. This means that the lens is only optimised through the optical centre, and aberrations occur in the peripheral zones. These lens zones are often used by children as they frequently move their eyes rather than their head to take in the world around them.

To better understand their visual behaviour an Essilor study examined and measured the eye head coordination in 169 children aged between 6-14 years old and found that children are mainly eye movers. 77% of the children were identified as eye-movers.

This means that children will tend to look through every part of the lens instead of just the central area.
It is therefore important to provide good visual acuity on all gaze directions for children’s lenses rather than just through the centre of the lens.
 
The period of life between the ages of six to twenty is when vision experiences high visual demands. Children use their vision to learn about their world and as they progress in school the amount of time spent on reading and writing increases significantly, while the size of print often becomes smaller as their reading skills become more advanced.

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