Visual acuity is our ability to see clearly. As humans our eyesight may not be as impressive as some other mammals but nevertheless it serves us sufficiently to conduct our daily activities. But eyesight problems have become commonplace in the modern world for a number of different reasons. It is lifestyle-related, due to genetics and even associated with some of the chronic diseases that have become common these days. The common causes of bad eyesight can vary. It may be a problem with the way light is bent, the amount of light that can enter the eye or a deterioration of the light-sensitive eye tissue. How Eyesight Works In order to understand how bad eyesight arises, it is first important to understand normal vision. Light rays enter the eye through the transparent cornea. The cornea bends (refracts) the light through the pupil. The refractive index of the cornea stays constant. The partially bent light now passes through the fluid in the front chamber of the eye (aqueous humor). It then passes through the lens within the eyeball. The lens can alter its shape at will to change its refractive index. This ability is known as accommodation. The light will be … Continue reading 6 Common Causes Of Bad Eyesight (Poor Vision)