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The Big Half 2024 – London

The Big Half is back for 2024! The vibrant, inclusive half marathon with a fun, festival atmosphere sees thousands of runners take on the 13.1 mile course through London, from Tower Bridge to the iconic Cutty Sark in Greenwich.

x-linked inheritance

X-linked inheritance means that the faulty gene is located on the X chromosome, the larger of the two sex chromosomes.

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Every experience counts: Insights from our sight loss survey

A huge thank you to everyone who completed our 2025 sight loss survey. This year we received over 600 responses. It follows similar surveys in 2019 and 2022 which led directly to the introduction of our Unlock Genetics and Discover Wellbeing resources, as well as shaping our work with the professional community who support people with inherited sight loss.