OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which type of lens is used to correct long sightedness?

Concave lens
Convex lens
Flat lens
Cylindrical lens

The correct answer is: Convex lens

Long sightedness, also known as hyperopia, occurs when the eye is unable to focus on nearby objects clearly due to the light entering the eye being focused behind the retina. A convex lens is used to correct this vision problem because it converges light rays before they enter the eye. When a convex lens is placed in front of a long-sighted eye, it increases the focal point closer to the retina, allowing the person to see near objects more clearly. Convex lenses are thicker in the middle and thinner at the edges, which makes them effective in bending light rays inward towards the retina, making them essential for individuals with hyperopia who need assistance focusing on near tasks, such as reading or sewing. Understanding the function of the convex lens in correcting long sightedness helps in grasping the broader concepts of optics and vision correction techniques.