A person suffers from both myopia and hypermetropia simultaneously. What type of spectacle lenses would be pr…

Question

A person suffers from both myopia and hypermetropia simultaneously. What type of spectacle lenses would be prescribed for such a person, and how are the two corrective components arranged in these lenses?

Accepted Answer

## Model Answer A person suffering from both myopia and hypermetropia is prescribed **bi-focal lenses**. These lenses have two components arranged as follows: - **Upper portion** — a **concave lens**, which corrects myopia and facilitates **distant vision**. - **Lower portion** — a **convex lens**, which corrects hypermetropia and facilitates **near vision**. Source: Light – Reflection and Refraction / Human Eye and Colourful World, Section 10.2(c) --- ## Explanation The examiner expects you to name the lens type (bi-focal) and correctly describe the arrangement of both components with their functions. Many students forget to specify *which part* holds which lens — that detail carries marks. The concave (upper/distance) and convex (lower/near) arrangement must both be stated.

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