Long Sight and Correction

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Questions and Answers

What happens to the lens when viewing near objects?

  • It becomes thinner and less convex
  • It becomes more thick and convex (correct)
  • It remains the same shape
  • It changes color

What is the function of the rod cells in the retina?

  • To detect color
  • To detect dim light (correct)
  • To enhance peripheral vision
  • To perceive depth

What is the function of the cone cells in the retina?

  • To perceive depth
  • To enhance peripheral vision
  • To detect dim light
  • To detect color (correct)

What is the purpose of a hand lens?

<p>To see very small objects (C)</p> Signup and view all the answers

What is the reason for the blind spot?

<p>A lack of light-sensitive cells (D)</p> Signup and view all the answers

What is the correction for short sight?

<p>Wearing glasses with a concave lens (B)</p> Signup and view all the answers

What is the function of the ciliary muscles in the eye?

<p>To focus light onto the retina by changing the thickness of the lens (A)</p> Signup and view all the answers

What is the role of the optic nerve in the process of seeing?

<p>To transmit messages from the retina to the brain (D)</p> Signup and view all the answers

What is the purpose of the cornea in the eye?

<p>To allow light to enter the eye (A)</p> Signup and view all the answers

What is the function of the eyebrow in the eye?

<p>To prevent sweat from entering the eye (A)</p> Signup and view all the answers

What is the reason for the blind spot on the retina?

<p>The optic nerve leaves the eye at that point (A)</p> Signup and view all the answers

What is the effect of more pigment in the iris?

<p>Eye colour is grey or brown (B)</p> Signup and view all the answers

What is the purpose of wearing concave lenses in long sighted individuals?

<p>To bend light before it reaches the eye and focus it back onto the retina (C)</p> Signup and view all the answers

What is the main cause of astigmatism?

<p>Irregular cornea or lens (D)</p> Signup and view all the answers

What determines the pitch of a sound?

<p>The frequency of sound (D)</p> Signup and view all the answers

What is the result of an image formed behind the retina?

<p>Long sight (D)</p> Signup and view all the answers

What is the correction method for cataract?

<p>Replacing the lens with an artificial lens by surgery (B)</p> Signup and view all the answers

What is the purpose of the three cone cells in the eye?

<p>To distinguish between different colours (B)</p> Signup and view all the answers

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