In other words, itâs the amount of weight your tire can support safely. For example, if a tire has a load index of 92, it can support 1,389 pounds at maximum air pressure. Multiply that by four tires (4 x 1,389 = 5,556 pounds) to get your carâs maximum loadâcarrying capacity.
Other causes of headaches that are situated behind the eye include: Tension headaches are some of the more common headaches that develop behind the eyes. This can be caused by stress, eye strain or lack of sleep. These headaches normally go away as soon as the individual gets enough rest. Headaches behind the eyes may be due to one of the following problems of the eye:
â¢ The pupil (the black circular opening in the iris that lets light in) â¢ The sclera (the white part) â¢ The conjunctiva (a thin layer of tissue covering the front of the eye, except the cornea) Just behind the iris and pupil lies the lens, which helps to focus light on the back of the eye. Most of the eye is filled with a clear gel called the vitreous. Light projects through the pupil and the lens to the back of the eye. The inside lining of the eye is covered by special light-sensing cells that are collectively called the retina. The retina converts light into electrical impulses. Behind the eye, the optic nerve carries these impulses to the brain.