This lens is a monthly reusable contact lens. Patients find their vision is clear and stable all day. This is achieved by their PRECISION BALANCE 8|4™ Lens Design. This works by having stabilization points on the lens at 8 and 4 o’clock. Compared with the traditional ‘prism- ballast’ design, this lens has a lower amount of prism in the optic zone at 6 o’clock. This not only makes the lens more comfortable by minimising interaction with the lower lid, but also allows more oxygen transmission. There are three scribe marks at 3, 6 and 9 o’clock as it helps to make sure the lens is sat in the correct position. Like the spherical Air Optix lens, the Air Optix for Astigmatism lens benefits from their ‘permanent plasma technology’ which reduces the build-up of deposits and improves comfort.