It is easy to see the difference in reading for meaning when the span of perception is wide. The ultimate visual skill is visualization. This is similar to being able to see things in the mind's eye. There are authorities that state that the ability to visualize is very closely allied to the ability to think. In other words, thinking is related to the ability to abstract from specifics and the ability to visualize is deeply involved in this process.
Visualization is also a trainable skill.
There are many other visual skills that time and space do not permit me to mention. When I see a child with a learning problem, I feel very strongly that there usually is more than just a single cause. For example, when I find a visual problem, if I probe a bit further, a nutritional problem will be found as well. Children often walk into the office eating a candy bar or sipping on a cola or other soft drink. When they are asked what they had for breakfast, the response usually falls in the frosted, sugary flake category or the answer is that they had no breakfast at all.