Presbyopia
Presbyopia is an age-related defect in which the power of accommodation decreases and near vision becomes difficult.
Practice This ConceptMain explanation
Teacher explanation
As a person grows older, the ciliary muscles weaken and the eye lens loses flexibility. The near point shifts farther away, so reading nearby text becomes difficult. In many cases, bifocal lenses or suitable combinations of lenses are used for correction.
Example
An older teacher may be able to see the blackboard clearly but need reading glasses for a small-print book.
Simple analogy
Age goes up, near focus goes down.
Common confusion
Students often think presbyopia is the same as myopia. It is different because it mainly occurs with age and is linked to reduced accommodation.
Exam tip
Mention age, reduced accommodation, and the shifting near point when you answer presbyopia questions.
Answer writing and exam use
1-mark use
Write the exact meaning of presbyopia in one clean line.
2-mark use
Define presbyopia and add one example or condition.
3-mark use
Explain presbyopia, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
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