I would like to thank the Gemstone Foundation for their kind permission to include this lovely video that explains about eye tracking problems and vision therapy

Typical signs of an eye movement dysfunction.

Loss of place

skipping lines,

misreading short words or word beginnings/endings

words get in wrong order

lines tend to blur, sway or move, sometimes referred to as "visual stress"

If a person's eyes can not properly "track" from word to word smoothly and seamlessly, reading, writing, and copying are going to be major problems.

Technically, eye movement and tracking problems are referred to as "oculomotor dysfunctions".  They are often present very early in a child's vision development, but do not become problematic until a child is asked to read, copy, and attend to tasks which require good eye movement control skills  

Often children with eye movement, focusing, and eye-teaming dysfunctions are unfairly accused of "not paying attention", "not trying hard enough", or just being "lazy learners".   Misdiagnosis of dyslexia, ADD, ADHD, or other learning disabilities often will occur.