Seeing

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We humans rely on our senses of sight more than a lot of other animals. A cat can easily find its way in the dark thanks to its sensitive whiskers, but if you try closing your eyes and trying to find your way from your desk to the office kitchen, you'll probably hurt yourself (or others). The smell of microwavable entrees doesn't guide you with precision, nor can you pinpoint the sounds of conversation accurately enough to keep you from running into the wall outside. We perceive the world largely through our eyes.

Anatomy of the Human Eye

Directions: Watch the following four videos related to sight and answer the associated questions.