The lens of the eye can change shape. The lens becomes thicker and more curved when a person looks at a near object. The lens becomes thinner when the person looks at a distant object.
Explain why the lens must be thicker to see near objects clearly.
As people get older, the lens becomes stiffer and cannot become as thick.
Explain why many older people find it difficult to read a book.
Suggest why holding the book further away helps older people to read it.
42 exam-style questions on Edexcel GCSE Biology 2.4 The eye, covering 2.4.1 Structure and function of the eye and 2.4.2 Eye defects and their correction. Each one has a worked solution and a mark scheme showing where the marks go.