The Eye

The Eye

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers.
The of the eye is made of tough tissues to maintain the of the eye. The is a transparent window at the front of the eye. It is and therefore focuses the light a little. The controls the size of the . In bright light, the muscles contract to make the pupil . In dim light, the muscles contract to make the pupil .

The can change shape. To focus on a distant object the muscles , the become tight and the lens becomes . To view a near object the ciliary muscles and the suspensory ligaments so the lens becomes .

The consists of rods and cones. The can work in light intensity but only allow us to see in . The are concentrated around the . The allow us to see things in greater detail and distinguish , but require light intensities.

The prevents internal reflection. run over the inner surface of the retina and join up at the to form the .