Vision & Eyesight: Nearsightedness
If the lens in the eye is too strong (too converging), or the cornea is too thick, or the eye is too long, it will cause the real image to get formed in front of the retina. This will cause a blurred image. We call it nearsightedness (myopia). Uncorrected, nearsightedness basically means you can't see things from a distance.
Since the problem is that the rays are converging too soon, we want to undo some of the convergence. Divergence undoes convergence. As a result, nearsightedness is usually corrected by placing a diverging lens in the front eye.
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