<prompt> Which of the following prevent lens opacity by free radical scavenging?GlutathioneCatalaseVitamin AVitamin E  <response>: Rediced glutathione is the most impoant anti-oxidant mechanism in lens. Ref: Yanoff ch.501; Biochemistry of Lens p.330; Parson 22nde p.26120the p.248; Alders Physiology 10the p.130. 