|Retinal degeneration refers to the eye disease or disorder of the human. In this there is complete deterioration of the retina caused by the eventual or progressive death of the cells of retina. It can occur due to many reasons like occlusion of artery or vein, diabetic retinopathy or heredity disease. This disease targets on the photoreceptors or the adjacent retinal pigment epithelium.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.