Just got finished with an ophthalmics skills test. One part of it required picking up a lens and figuring out what the power was just by shaking it back and forth. The first time I saw someone do it, I was shocked. The doctor just asked for a student's glasses, looked through them while moving them around a bit, then announced her prescription right on! It felt like some sort of magic trick, but it's all optics. Hey, who knew that I'd be able to do that only a few weeks after seeing i...
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