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Presbyopia: the bifocal lens and its parts

The same question, asked 3 times: 2023*, 2024*, 2025. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2023

    29
    Draw a labelled diagram of a common type of bifocal lens. State the function of each of its parts. Name the defect for the correction of which it is used and state its main cause.

  2. Question 2

    2024

    25 (b)
    What is presbyopia ? Name the type of lenses used for the correction of this defect. State the nature (converging/diverging) of the upper part of such lenses.

  3. Question 3

    2025

    25 (B)
    Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.