I began to notice my sight deteriorating in my 40s, but not just in the way that you expect it to with age. I had night blindness and blind spots in my field of view. At 44, I was diagnosed with retinitis pigmentosa, a genetic eye condition that causes the retina cells to die. I had always been a very visually oriented person: I was a practising architect, and someone who loved to read, draw, go to the cinema and visit art exhibitions. So when black text disappeared on a glaring white page, films became impossible to follow and artworks only took shape once explained to me, I questioned who I would be without my vision.

Around the age of 50, I had a particularly stressful year: I got divorced; dissolved my business; started a new job; moved house; and my dad died. As my life fell off a c

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