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.

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s