also joining me, jean bennett, steven schwartz, eberhart ofnner, and carla shatz stanford university and once again, eric kandel a nobel laureate and a howard hughes medical investigator. toegan with my friend eric give me an overview of our subject tonight. >> the last program we did was approaches to deafness. tonight we are going to consider lines miss. as is the case with deafness, blindness is not a life threatening situation but it is disabling. in some ways it is more disabling than deafness because there are a number of important conditions for which there is no treatment. now, why is that so? deafness, the sensory organ for vision, the retina, which is evident in the lower image, it lines the inside surface of the eye. oft is the most complex set organs we have. in fact, it is not a proof real organ. it is actually a part of the central nervous system. as a result, it has the complexity of the structure. it is not uniform. it has a small area that is clear which is called the macula. area of greatest visual acuity. so if i turn my head towards analyzes youra features. unfort