Accommodation is the ability to shift visual attention from one viewing distance to another. A majority of school children with learning difficulties (according to some studies up to 96%) will show some form of vision problems, particularly with accommodation.
HOW DO WE SEE THAT A CHILD HAS PROBLEMS WITH THIS?
Children with reduced ability to facilitate a change of focusing distance will experience problems with copying off the board, it will take them a very long time to clearly focus their eyes while looking at the white-board and then at the note book, very often they lose their place while copying. In addition, often their handwriting might appear sloppy (big letters, small letters, above and below the lines). Frequently, they need more time to accomplish tasks than the majority of children in their class.
WHAT CAUSES BLURRED VISION IN ADULTHOOD
Ocular accommodation physiologically declines in 5th decade of life dramatically and more and more often we see it earlier, sometimes at the beginning of the 4th decade due to today's lifestyle: Lots of near work, various screens, particularly tablets and smart phones when used for prolonged time affect the dynamic of the ciliary muscle greatly - and this in turn has great repercussions on our ability to accommodate various viewing distances and causes blurred vision.
The blurred vision usually starts at reading-distance and in the majority of cases thereafter extends to further distances. This goes hand-in-hand with symptoms of Presbyopia.