In a person with a particular visual disorder, light from a distant object focuses in front of the retina.
 

How can this disorder be corrected?

1. Laser surgery to reshape the retina
2. Use of a diverging lens in front of the eye
3. Use of a converging lens in front of the eye
4. Laser surgery to make the cornea more curved

1. Explain how problems with the structure and function of the eye can cause a named visual disorder.  (3 marks)
   

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2. Describe ONE technology that is used to assist with the effects of a named visual disorder.  (3 marks)
   

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A patient has experienced an injury that affected the retina of her eye. She asked her doctor if LASIK eye surgery could help restore her sight. The doctor said that LASIK eye surgery would have no impact on her condition.

Why did the doctor give this advice?

1. LASIK eye surgery is a replacement of the lens in the eye and cannot repair a retina
2. LASIK eye surgery will only temporarily repair her retina and her vision problems would return
3. LASIK eye surgery is only used for people who have a damaged cornea and cannot repair a retina
4. LASIK eye surgery is only used to change the shape of the cornea to enhance vision and cannot repair a retina

A person with normal vision and a person with myopia are both looking at an object in the distance.

Construct THREE labelled diagrams of an eye to show the light path through the eye of the person with:   (5 marks)

• • normal vision
  • myopia
  • myopia corrected with a suitable lens.

1. Identify TWO structures that refract light as it passes through the eye.   (2 marks)
   

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2. The diagram shows the human eye. The two lines labelled `A` and `B` represent two beams of light passing through the eye and stimulating different areas of the retina.   

1. The visual perception will be different at the two stimulated areas.
2. Identify TWO of these differences.  (2 marks)
   

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A person with short-sighted vision (myopia) was incorrectly given a pair of spectacles with convex lenses.

Which row of the table demonstrates what happens?
 

The diagram shows a model of the human eye.
 

Which of the following correctly identifies a labelled part and its function?
 

\begin{align*}
\begin{array}{l}
\rule{0pt}{2.5ex} \ \rule[-1ex]{0pt}{0pt}& \\
\rule{0pt}{2.5ex}\textbf{A.}\rule[-1ex]{0pt}{0pt}\\
\rule{0pt}{2.5ex}\textbf{B.}\rule[-1ex]{0pt}{0pt}\\
\rule{0pt}{2.5ex}\textbf{C.}\rule[-1ex]{0pt}{0pt}\\
\rule{0pt}{2.5ex}\textbf{D.}\rule[-1ex]{0pt}{0pt}\\
\end{array}
\begin{array}{|c|c|}
\hline
\rule{0pt}{2.5ex}\quad \textit{Label} \quad \rule[-1ex]{0pt}{0pt}& \quad \textit{Name} \quad & \textit{Function} \\
\hline
\rule{0pt}{2.5ex}\text{I}\rule[-1ex]{0pt}{0pt}&\text{Cornea}&\text{Refract light}\\
\hline
\rule{0pt}{2.5ex}\text{I}\rule[-1ex]{0pt}{0pt}& \text{Retina}&\quad \text{Transmit light}\quad \\
\hline
\rule{0pt}{2.5ex}\text{II}\rule[-1ex]{0pt}{0pt}& \text{Retina} &\text{Focus light}\\
\hline
\rule{0pt}{2.5ex}\text{II}\rule[-1ex]{0pt}{0pt}& \text{Cornea} &\text{Absorb light}\\
\hline
\end{array}
\end{align*}