A vision testing tool, often available as a digital document designed for local output, serves as a means to assess visual acuity. The resource typically presents a series of standardized symbols or letters of diminishing size, requiring the individual being tested to identify them from a set distance. Example: a Snellen chart formatted as a PDF file for printing at home or in a clinic.
The utility of such charts lies in their accessibility and convenience for preliminary vision screening. They allow for readily available vision checks, particularly beneficial in situations where professional eye examinations are not immediately accessible or for monitoring vision changes over time. Historically, these charts have been a cornerstone of vision assessment, providing a standardized method for evaluating sight capabilities.
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