Not necessarily true. A new environment may trigger other kinds of evolutionary paths. For example, someone may be sensitive to radiation from cell phones and thus not able to produce offspring, while others are not sensitive.
Furthermore evolution is not only about the evolution of a single individual. That an induvidual with bad eyesight survive my be benificial for the species as a whole.
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Not necessarily true. A new environment may trigger other kinds of evolutionary paths. For example, someone may be sensitive to radiation from cell phones and thus not able to produce offspring, while others are not sensitive. Furthermore evolution is not only about the evolution of a single individual. That an induvidual with bad eyesight survive my be benificial for the species as a whole.