Nearsightedness, or myopia, is a common vision condition where distant objects appear blurry while close objects can be seen clearly. The correct answer is [B] Concave. This occurs because the eye’s shape causes light rays to focus at a point in front of the retina rather than directly on its surface. A concave lens, being a diverging lens, spreads out the light rays before they enter the eye. This divergence effectively moves the focal point back onto the retina, allowing for clearer vision of distant objects. Concave lenses are thinner at the center and thicker at the edges, which helps to diverge the incoming light appropriately. This corrective measure is crucial in eyeglasses or contact lenses prescribed for individuals with myopia, helping them see distant objects more clearly and reducing the strain on their eyes. Convex lenses, on the other hand, are used to correct farsightedness, not nearsightedness.