In recent years, specialists in linguistics have become increasingly aware of a fundamental reason for poor reading. That is the reading of words one by one, instead of promptly recognizing their grouping, the patterns in which they are joined, or in other words sentence structure. The way a person reads orally seems to be a reliable indication of how he reads silently, for as a leading authority has remarked, "it is not likely that a word-caller in oral reading will read silently by language structures."* so it should be easy to determine in any case whether this basic fault is the explanation of a person's lack of skill in reading.
Foley, L. (1964). Little Things Can Make Reading Easier. Reading Horizons: A Journal of Literacy and Language Arts, 5 (1). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol5/iss1/2