Here is my layman's attempt at a definition. Have It Without an Eye Exam .
High myopia does predispose to glaucoma.
The higher the myopia, the greater the chance of getting open-angle glaucoma. However, when you get up into the -10 range, there seems to be a jump. Also, the higher the myopia, the less resistance there seems to be to developing optic disc damage at any pressure level. A fair amount of fluctuation can occur in taking visual field tests which has nothing to do with actual worsening or improvement. On the printout, there is a space for the technician to note the size of the pupil during the test.