What does symmetrical bow astigmatism mean?

Astigmatism is caused by corneal deformation, such as football. After the light enters the cornea, it will fall unevenly, resulting in blurred images and even ghosting. Far or near scenes will overlap and deform. Astigmatism must be corrected in time. If astigmatism is not corrected in time or by deepening myopia, there will be many mistakes in daily life, especially when reading or working on the computer, the eyes are easily tired, dry, and even have a headache or nausea. If you don't want to frame your nose, of course you want to choose invisibility. Attention should be paid to the choice of astigmatism contact lenses. First, when choosing to wear astigmatism contact lenses, the choice of lens stability, astigmatism and axial position is very important. If the design and manufacturing technology is insufficient, the manufacturer can't provide enough shaft position and can't guarantee the stability of shaft position. As long as the eyes move a little, the lens will rotate, resulting in focus shift, sometimes blurred and sometimes clear, which greatly affects life and health. Second, pay attention to whether the fitting can be successful once. Astigmatism fitting technology is very demanding. If the optometry is not accurate, the matched lens can not be well stabilized in the axial position, and the vision can not be well corrected. Third, pay attention to the wearing cycle. Usually astigmatism contact lenses should be worn every year. With the development of technology, disposable astigmatism lenses have appeared. Discarding astigmatism contact lenses once a month can effectively reduce protein accumulation, reduce the chance of eye sensitivity and inflammation, and make eyes healthier. Dr. Li Lomb's innovative technology, clear astigmatism contact lens, has a unique patent design of Lo-Torque intelligent positioning, always keeps close to the eyeball rotation, can lock the ideal astigmatism axis, the lens is stable and does not shift, the astigmatism correction effect is the best, and the vision is stable and clear for a long time. Non-ionic material can effectively prevent protein accumulation, greatly reduce the probability of eye sensitivity and inflammation, and make you wear it healthier and more assured! Unique marking system: the special marks at 5 o'clock, 6 o'clock and 7 o'clock (every 30 degrees) provide reference for the rotation and orientation of the lens, which makes the try-on faster and more convenient, reduces the trouble of repeated auditions, and the success rate is over 95%.