2.88 understand the function of the eye in focusing near and distant objects, and in responding to changes in light intensity

  • Near objects – ciliary muscle contracts, slackening the suspensory ligament making the lense ‘fat’
  • Distant objects – ciliary muscles relax, tensing the suspensory ligaments, making the lense ‘thin’
  • Bright light – circular muscles contract, iris gets bigger so the pupil gets smaller. Less light gets into the eye
  • Dark light – radial muscles contract, iris gets smaller, pupils get bigger, more light gets into the eye.
This is a paper 2, triple science fact.



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