Grade 12 Life Science Session on the Nature & Treatment of Visual Defects. This video highlights the nature and treatment of visual defects such as Myopia, Hypermetropia, Astigmatism and Cataracts. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Like this:Like Loading... Related Published by ArcelorMittal Science Centre (Sebokeng) View all posts by ArcelorMittal Science Centre (Sebokeng)