Presbyopia is the age-related loss of accommodation that is commonly seen in people over 40 years old. Presbyopia occurs because the lens loses its elasticity and the ability to focus on near objects. What are the options for treating presbyopia? There are now numerous treatments, including spectacles or contact lenses, undergoing corneal refractive surgery, or implantation of multifocal intraocular lenses. Spectacles with bifocal or progressive lenses represent the most common method employed to correct presbyopia.
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. 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.
Last date updated on July, 2014