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Prof Andrew Lotery is one of the Consultant Ophthalmologists involved in the Ivan trials, comparing the drugs Avastin and Lucentis as a treatment for Age-Related Macular Degeneration.
The trials showed that the side-effects of both dugs are equally of risk to patients.
Prof Lotery says he feels there is now enough information for the Department of Health to require NICE to issue guidance to clinicians. Currently doctors make decisions to use Avastin off-label.

Tony Shearman reports from the Olympic Stadium on the Paralympic test event, which allowed athletes to see the stadium for the first time and try out facilities.
Tony talked to some of the Team GB medal hopefuls.
Paralympic Legend, Noel Thatcher, who won 5 Paralympic golds for running, tells Peter that more needs to be done by sports' bodies to encourage and select up and coming visually-impaired athletes. Their medal count has fallen significantly since he was a competing athlete.
'Visually-impaired people have the potential, but not the opportunity' he says.