A modular eyewear system (700) including magnetic mounting means for releasable magnetic mounting of one or more eyewear elements (710) such as a loupe assembly or a similar magnification system to a frame member for wearing on a wearer's head. Both the frame member and the loupe assembly are provided with complementary magnetic mounting means, whereby the loupe or magnification system is releasably mountable to the frame member. Other elements of the modular system include light delivery means, eyesight correction lenses, protective eyeshields, adjustable nosepieces, optical filter elements, masks and helmets, the system allowing these elements to be used separately or together depending on the desired use.