Changes at the Macular Society continue to generate a significant proportion of the contact we get from In Touch listeners. With the consultation exercise now at an end, we're joined by the Society's CEO, Ed Holloway. We discuss a range of issues with Ed, including the rationale for making the changes, what the new organisational structures will look like and what it means for those who provide the charity's services and those who use them.

Another development regarding macular disease is the clinical trial of Prima implants. The trial involves inserting a microchip with the thickness of a human hair under the retina with the aim of restoring a degree of vision. The BBC's Medical Editor Fergus Walsh joins us to explain the technology in more detail and with news of encouraging results.

Presenter: Peter White

Website image description: Peter White sits smiling in the centre of the image, wearing a dark green jumper. Above Peter's head is the BBC logo (three individual white squares house each of the three letters). Bottom centre and overlaying the image are the words "In Touch"; and the Radio 4 logo (the word Radio in a bold white font, with the number 4 inside a white circle). The background is a bright mid-blue with two rectangles angled diagonally to the right. Both are behind Peter, one of a darker blue and the other is a lighter blue.’