Dr Damion Corrigan wanted to be a medical doctor and when that seemed out of his reach, he took another route to working to improve medical testing. He says the field of science is opening up for prospective visually impaired scientists. Comedian Chris McCausland and actor Chloe Clarke debate whether it's a realistic assertion that all visually impaired roles on TV, in film and on stage should be played by partially sighted actors. Presenter: Peter White Producer: Lee Kumutat