Featuring high quality Permaview glass, these ophthalmic lenses will stand up to repeated sterilization. Like other Volk lenses, our autoclavable BIO lenses provide high magnification and outstanding image resolution with a double-aspheric lens design that corrects for field curvature, astigmatism, aberrations, and coma. Volk carries two different autoclavable BIO lenses: the 20D ACS® for general diagnostic use, and the 28D ACS® for wider field fundus scanning. Available Autoclavable BIO Lenses Include: 20D Clear ACS PermaView 28D Clear ACS PermaView Permaview glass withstands repeated sterliziation Double-aspheric lens design Steam sterilizable 20D ACS® offers high magnification for excellent views of the optic disc and macula 28D ACS® provides high resolution ideal for wide field fundus imaging 28D ACS® ideal for small pupil diagnosis and treatment