A companyâs inventory turnover ratio refers to how quickly goods enter and leave storage at the business. Itâs most often used in relation to companies that deal in perishable goods, such as foodstuffs, or high-demand retail items. Itâs easy to calculate in theory, but itâs not always easy to interpret.
The retina is the light-sensitive layer at the back of the eye that is responsible for vision. Blood circulation to most of the retina's surface is primarily through one artery and one vein. If either blood vessel or one of their smaller branches is blocked, blood circulation to the retina can be significantly disrupted. The blockage is called an occlusion.
When a retinal vein is blocked, it cannot drain blood from the retina. This leads to hemorrhages (bleeding) and leakage of fluid from the blocked blood vessels. There are two types of retinal vein occlusion: Central retinal vein occlusion (CRVO) is the blockage of the main retinal vein. Branch retinal vein occlusion (BRVO) is the blockage of one of the smaller branch veins. Nerve cells need a constant supply of blood to deliver oxygen and nutrients and blood vessels provide this supply.