A refractive error is a very common eye disorder which affects your eye ability to focus on the images from the outside world which means you will face difficulty to see the objects clearly. The result of refractive errors is blurred vision and sometimes this is so severe that it will cause visual impairment. What causes refractive error eyes? The following are the four most common causes of refractive errors: a) Myopia (nearsightedness): In this type of refractive error you will face difficulty...