Measure width of "H", Calculate "d." Have child stand "d" distance away from Computer Screen.
from width of "H" w, screening distance d= 10 ft x (w/21.5mm)
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Measure width of "H", Calculate "d." Have child stand "d" distance away from Computer Screen. |
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| from width of "H" w, screening distance d= 10 ft x (w/21.5mm) |
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| ABCD-VISION.ORG | Familiarize with Large Letters |
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