Uploaded: 2010-05-04T04:00:00-07:00
Channel: No Author
Description: Nine-year-old Ben asks how doctors know when people need glasses. Dr. Jim explains how physicians — and teachers — can tell when a kid needs glasses.

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Nine-year-old Ben asks how doctors know when people need glasses. Dr. Jim explains how physicians — and teachers — can tell when a kid needs glasses.

Glasses