The central part of the retina where the light rays are focussed after passing through the pupil and the lens is a circular area called the macula. The center of this circular area is the fovea. The fovea and a small area surrounding it are not supplied by the central retinal artery or its branches, but instead by the choroid.
In some cases - approximately 20% of the population - there is a branch of the ciliary circulation called the cilio-retinal artery which supplies the retina between the macula and the optic nerve, including the nerve fibers from the foveal photoreceptors. If this artery is present, the central vision will be preserved even in case of CRAO.
Research reports from Tokyo Women's Medical University provide new insights into retinal vein occlusion.(Report)
Jun 18, 2009; "The relationship between the blood-flow velocity in the perifoveal capillaries and macular oedema was investigated in patients...
Wipo Publishes Patent of Kyoto University and Kabushiki Kaisha Topcon for "Fundus Oculi Observation Device and Fundus Oculi Image Analysis Device" (Japanese Inventors)
Sep 12, 2013; GENEVA, Sept. 12 -- Publication No. WO/2013/128975 was published on Sept. 6.Title of the invention: "FUNDUS OCULI OBSERVATION...