Some people’s eyes struggle with ‘tracking’ – moving along a page or screen to follow text. Some possible reasons for tracking problems are outlined below.
Teaming - The muscles around the eyes help them move in tandem. If they are not properly coordinated, a person may experience blurry vision, and struggle to follow text. Lazy eye (amblyopia or strabismus) can result in teaming problems, and both conditions primarily affect children. But people with permanent strabismus, where one eye is constantly turned away, tend not to struggle with reading, as they only use the better eye to process text.
Peripheral vision - Some people have a limited field of vision, and may not be able to process a whole word, phrase or sentence as a result. Prescription lenses can expand the field of view.
Difficulty "tracking" may also be caused by hyperopia or presbyopia.