Retinal oximetry (oxygen saturation) and peripapillary vascular diameters in normal eyes and in non-arteritic ischemic optic neuropathy (NAION)

Retinal oximetry is a non-invasive dual wavelength photo-spectrometric imaging of the retina which gives the oxygen saturation in the retinal vessels. Non-arteritic ischemic optic neuropathy results due to ischemia in the circulation of the optic nerve head. The central retinal artery enters the eye through the optic nerve. The disc swelling may directly affect the arterioles and venules, or the same pathology affecting the optic nerve head circulation may also affect the retinal circulation. We aim to study these alterations in the retinal vessels in cases of non-arteritic ischemic optic neuropathy