Those skills include:
Ability to see clearly and comfortably at 13-16 inches, the distance at which school deskwork should be performed.
Ability to see clearly and comfortably at 10 feet or more.
Ability to use the two eyes together.
Eye Movement Skills
Ability to aim the eyes accurately, and move them smoothly across a page and quickly and accurately from one object to another.
Ability to be aware of things to the side while looking straight ahead.
Ability to use the eyes and hands together.
If any of these or other vision skills is lacking or not functioning properly, your child’s eyes have to work harder. This can lead to blurred vision, headaches, fatigue and other eyestrain symptoms.