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Visual Agnosia

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...

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Communicating Visualizations without Visuals: Investigation of Visualization Alternative Text for People with Visual

Crescentia Jung, Shubham Mehta, Atharva Kulkarni

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|September 30, 2021

Summary

Alternative text for data visualizations is crucial for users with visual impairments. Recommendations focus on referencing underlying data to improve information access and reduce cognitive load for these users.

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Area of Science:

Human-Computer Interaction
Accessibility Research
Data Visualization

Background:

Effective alternative text (alt text) is essential for visual content accessibility, particularly for complex data visualizations.
Gaps exist between current alt text guidelines and actual practices, potentially exacerbating information inequality for visually impaired individuals.

Purpose of the Study:

To align existing alt text guidelines with current practices for data visualizations.
To understand the specific needs and preferences of visually impaired users for visualization alt text.

Main Methods:

Consolidated existing guidelines and surveyed current practices for data visualization alt text.
Conducted interviews with 22 individuals with visual impairments about their experiences and needs regarding visualization alt text.

Main Results:

Participants actively interpret visualizations by constructing mental models from alt text.
Users desire to perform similar data retrieval tasks as sighted individuals.
Referencing underlying data in alt text is preferred over describing visual elements to minimize cognitive burden.

Conclusions:

Current alt text practices and guidelines require refinement to better serve visually impaired users.
Recommendations are provided for creating more informative and effective alt text for data visualizations.
Enhancing alt text can significantly improve information access and reduce cognitive load for users with visual impairments.