Sunday, April 3, 2016

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

Distant object
Ciliary muscles contract, suspensory ligaments relax so the lens becomes fat

 Near object
Ciliary muscles relax, suspensory ligaments contract so the lens becomes thin
Source: BBC Bitesize
Figure 1

 Low light
Circular muscles in the iris relax and radial muscles contract











Bright light
Circular muscles contract and radial muscles relax


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3 comments:

  1. IsabelleJune 3, 2016 at 1:22 AM

    Hey. Please correct me if i am wrong but I thought it was the other way round. So If an object is near, the lens is fat; If an object is far, the lens is thin.

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  2. Carolina Nina MatosJanuary 16, 2017 at 6:43 PM

    Hi, yeah, you're right - sorry. The table has the right answers, I've just typed it wrong :( Thanks though!! :) I'll change that as soon as I can.

    ReplyDelete
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