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Making Data Visualizations More Accessible

Researchers find blind and sighted readers have sharply different takes on what content is most useful to include in a chart caption

Adam Zewe
Wed, 11/10/2021 - 12:02
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In the early days of the Covid-19 pandemic, the Centers for Disease Control and Prevention produced a simple chart to illustrate how measures like mask wearing and social distancing could “flatten the curve” and reduce the peak of infections.

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The chart was amplified by news sites and shared on social media platforms, but it often lacked a corresponding text description to make it accessible for blind individuals who use a screen reader to navigate the web, shutting out many of the 253 million people worldwide who have visual disabilities.

This alternative text is often missing from online charts, and even when it’s included, it’s frequently uninformative or even incorrect, according to qualitative data gathered by scientists at MIT.

These researchers conducted a study with blind and sighted readers to determine which text is useful to include in a chart description, which text is not, and why. Ultimately, they found that captions for blind readers should focus on the overall trends and statistics in the chart, not its design elements or higher-level insights.

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