Question

Nearsighted people experience blurred vision while looking at distant objects, such as street signs viewed from inside a car. Conversely, farsighted people experience blurred vision while looking at nearby objects, such as words on a page. The causes of these two conditions differ as well. Nearsightedness, or myopia, occurs either when a person's eye is too long from back to front or when the cornea (the clear layer at the front of the eye) is too curved. On the other hand, farsightedness, or hyperopia, results when the eye is too short or when the cornea is not curved enough. Fortunately, corrective lenses can restore normal vision in both cases. As you might expect, these lenses are of opposing types: nearsightedness is improved with a lens that is thinner in the middle and thicker at the edges, while farsightedness is compensated for with a lens that is thicker in the middle and thinner at the edges. The main idea of the passage is Nearsightedness and farsightedness produce contrasting vision problems, have opposite causes, and require different types of lenses. How does the detail in bold develop the main idea? It contrasts the cause of farsightedness with that of nearsightedness. It addresses a common misunderstanding about the causes of farsightedness.​

Answer 1

The bold text details that hyperopia is caused by an eye too short or insufficient power in the lens, contrasting with myopia caused by an eye too long or a lens too strong.

Step-by-step explanation:

Nearsightedness, or myopia, and farsightedness, or hyperopia, are common vision conditions caused by different anatomical irregularities in the eye that require corrective lenses of opposing types It emphasizes the anatomical differences and lays the groundwork for understanding why different types of corrective lenses are needed. The detail in bold highlights how hyperopia involves the eye's inability to sufficiently converge rays from close objects onto the retina. This contrasts with myopia, where the eye over converges rays from distant objects, causing them to cross before hitting the retina. The difference in the anatomy—an eye too short in hyperopia versus an eye too long or a lens too strong in myopia—is addressed in the bold text and helps to explain why different lenses (convex for hyperopia and concave for myopia) are used for vision correction.