If the lens in the eye is too weak, or the cornea is too thin, or the eye is too short, it will cause the real image to get formed in beyond the retina. This will cause a blurred image. We would call it farsightedness (hyperopia). Uncorrected, farsightedness basically means you can't see things close up.
Since the problem is that the rays aren't converging soon enough, we need to increase the convergence. Farsightedness is usually corrected by placing a converging lens in the front eye.
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