This section is from the book "The Home Hand-Book of Domestic Hygiene and Rational Medicine. Volume 2.", by J. H. Kellogg, M.D.. Also available from Amazon: The Home Hand-Book of Domestic Hygiene and Rational Medicine, Volume 2.
This affection consists of a peculiar restless movement, or oscillation of the eyeballs. The movement is generally from side to side, but is sometimes rotary. Patients suffering this way are often obliged to read with the print turned in a vertical direction on account of the blurring from the letters running together. The affection is occasioned by a variety of causes, which are, unfortunately, generally of such a character as to render the condition incurable.