Setting bookmarks. Use the bookmarks options to define bookmark levels, create bookmarks from paragraph tags, and set up article threading. 1. In the PDF Setup dialog box, choose Bookmarks from the pop-up menu, or click the Bookmarks tab (Windows/UNIX). 2. Select Generate PDF Bookmarks.
Horizontal Pendular Nystagmus. 1  Lesions of the central tegmental tract (such as due to MS) 2  Spasmus Nutans (can also be vertical, torsional) 3  Nystagmus of the blind.  Congenital nystagmus.
1 There are different types of demyelination. These include inflammatory demyelination and viral demyelination.  MS is the most common demyelinating disease. In MS, demyelination occurs in the white matter of the brain and in the spinal cord. Lesions or âplaquesâ then form where myelin is under attack by the immune system. Many of these plaques (or scar tissue) occur throughout the brain over the course of years.