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As societies generate a greater productive surplus, their people generally:
Jaeger System
A chart used for testing visual acuity, especially for reading and near vision.
Visual Acuity
Visual acuity or the precision in seeing, often assessed by the capacity to recognize letters or numbers at a given distance.
Snellen Chart
A chart commonly used to measure visual acuity that consists of letters of progressively smaller size, used during eye examinations.
Near Vision Acuity
The ability to see clearly at a close range, typically measured to evaluate eyesight for reading and other close-up tasks.
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