Glaucomatous patients who have at least two consecutive abnormal and reliable standard automated perimetry (SAP). Patients considered suspects for glaucoma must have an IOP greater than 21mmHg or suspicious appearance of the optic nerve head but with reliable normal visual fields, defined as a PSD within 95% confidence limits and a GHT result within normal limits. To be considered healthy, subjects have to have IOP<22mmHg with no history of elevated IOP and with at least two reliable normal visual fields, defined as a PSD within 95% confidence limits and a GHT result within normal limits. Age related macular degeneration will be classified if presence of sings of the disease on posterior biomicroscopy (fundoscopy), indirect ophthalmoscopy or Optical Coherence Tomography (OCT) exams. Other retinal degenerations such as retinitis pigmentosa or with other diseases affecting the visual pathways such as ischemic neuropathy or optic neuritis may also be included.