Transient double vision at near work. Changing from black to grey and back, or having shadows. Difficulty keeping place or line. A need for a marker is classic of scanning difficulties. Problems remembering what has been read.
Reduced comprehension suggests increased attention is needed for visual control.
Eyestrain, headaches or fatigue with close work. All suggest that excessive effort is required, and all lead to reduced efficiency. In this short piece, the significance of vision problem in learning has been identified, and ideas on what to look for, as well as what can be done have been put forward. The reader who would like more information and has access to the Internet should search some of the relevant web sites, including a portal site of the author's, that gives access to many other sites of interest. We do not guarantee performance nor do we place any kind of requirements on them.