Annual eye examinations which include IOP check is the best method of prevention, especially after age 40.
Thanks to new technology glaucoma can be detected quickly and painlessly usually without dilation using either a Heidelberg Retinal Tomograph (HRT) or Heidelberg Ocular Computerized Tomography (OCT) which measures down to one micron accuracy. These technologies generate very precise, comprehensive analysis and documentation for early detection and follow-up mapping of disease progression.
Your IOP is measured by a tonometer (the blue light on the slit lamp) or by a new hand held device.
Your optic nerve is inspected and viewed both directly and by new hand held lens systems.
Gonioscopy lens allows direct inspection and grading of the tissue in the filtering/drainage area of the eye.
Visual field testing documents your peripheral vision in each eye and is standardized such that it monitors the changes that occur in the visual field.