What causes myopia, or short sightedness, in the eye?

Myopia occurs when light rays from distant objects are focused in front of the retina instead of directly on it. This results in blurred vision for far-away objects while close objects can be seen clearly.

This answer is strong because it clearly defines myopia and explains the mechanism behind it, demonstrating an understanding of how the eye's focusing system works. The question tests the student's ability to explain a specific condition related to eye function.