Font sizes used in Snellen chart when viewed at 20 feet and adapted
Download Table | Font sizes used in Snellen chart when viewed at 20 feet and adapted font sizes for viewing underwater display at 40 cm. from publication: Determining the appropriate font size, and use of colour and contrast for underwater displays | Color | ResearchGate, the professional network for scientists.
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Tumbling E Linear-spaced Distance Chart, Linear-spaced lines; line sizes range from 20/80 to 20/16. Lines are labeled with 20' notations only. This
E Chart for 20 feet (6 meters)
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Snellen Translucent Distance Vision Testing Chart 20 Feet Size 14 x 9 : : Industrial & Scientific