Purevision®2 for Astigmatism HD; Purevision 2 for Astigmatism with High Definition Optics,the new Silicon Hydrogel contact lenses from Bausch&Lomb feature HD Optics are designd to reduce halos and glare and deliver the clear, crisp vision that you should demand. Plus, this monthly replacement lens offers design advances for outstanding comfort and breathability. Daily wear up to 30 Days.