Study on Ocular Blood Flow and the Orbital Cerebrospinal Fluid Pressure in Glaucoma

1. Visual field testing will be performed. 2. Structural analysis of the retinal nerve fiber layer (through confocal microscopy)will be performed. 3. Color Doppler Imaging of the retrobulbar vessels will be performed. Peak and end diastolic velocities, resistivity index will be calculated from the Doppler waveform. 4. B-scan ultrasound of the optic nerve sheath diameter will be performed. the measure will take place at 3mm behind the globe.