Final answer:
Hyperopia, or farsightedness, is the vision condition where close objects appear blurry and distant objects are clear, caused by the eye being too short. It is corrected with a convex, or converging lens to increase optical power, which affects about a fourth of the population.
Step-by-step explanation:
The inability to focus well on close objects, commonly known as farsightedness, is referred to as hyperopia. People with hyperopia can see distant objects clearly, but their vision of nearby objects appears blurry because the eye is too short. This causes images to be focused behind the retina instead of on it. To correct this vision problem, a convex lens, which curves outward, is used. This type of lens is known as a converging lens and it increases the optical power so that images fall directly onto the retina, allowing close objects to be seen clearly.
Hyperopia is one of the most common vision problems, affecting about a fourth of the population. Symptoms of farsightedness include difficulty concentrating on objects that are close up, eye strain, headaches after close work, and aching or burning eyes following intense concentration on close tasks.