<prompt> Which does not handle free radicals inside lensVitamin AVitamin CVitamin ECatalase  <response>: Enzymatic antioxidant mechanisms :- Reduced glutathione most important, glutathione peroxidase, superoxide dismutase, catalase.Non-enzymatic defence mechanisms :- Vitamin C, Vitamin E, and possibly carotenoids.Some textbooks have also mentioned vitamin A as an anti-oxidant in lens. But, the best answer here is vitamin A because all other options have been mentioned as anti-oxidants in all textbooks, while vitamin A has been mentioned only in some textbooks. 