Worksheet: The Eye

In this worksheet, we will practice describing the structure and function of the components of the eye, and explaining how common eye defects can be treated.

Q1:

What is the function of the iris in the eye?

  • AThe iris transmits electrical impulses to the brain.
  • BThe iris alters the shape of the lens.
  • CThe iris protects the front of the eye and refracts light entering the eye.
  • DThe iris controls the size of the pupil and, therefore, how much light enters the eye.
  • EThe iris detects color.

Q2:

What is the function of the ciliary muscles?

  • ADetect colors
  • BAlter the shape of the lens
  • CTransmit electrical impulses to the brain
  • DControl the size of the pupil and therefore how much light enters the eye
  • EProtect the front of the eye and refract light entering the eye

Q3:

Which of the following statements about the retina is incorrect?

  • ALight is focussed on the retina so it can stimulate light-sensitive cells.
  • BCells in the retina include rod cells and cone cells.
  • CThe retina can change shape to allow different amounts of light to enter the eye.
  • DThe electrical impulses received by the brain from the retina are interpreted as a visual image.
  • EThe light-sensitive cells in the retina send electrical impulses along the optic nerve.

Q4:

Which of the following best describes how the eye adapts to a brightly lit room?

  • AIn bright light, the muscles in the iris contract and dilate the pupil.
  • BIn bright light, the muscles in the iris relax and dilate the pupil.
  • CIn bright light, the muscles in the iris contract and constrict the pupil.
  • DIn bright light, the muscles in the iris do not respond.
  • EIn bright light, the muscles in the iris relax and constrict the pupil.

Q5:

What is a cataract?

  • AA cataract is a buildup of dirt in the eye which makes it red and sore.
  • BA cataract is a buildup of carbohydrates in the lens that makes it cloudy.
  • CA cataract is a buildup of fats in the lens that makes it cloudy.
  • D A cataract is a buildup of protein in the lens that makes it cloudy.
  • EA cataract is a permanent damage to the iris of your eye.

Q6:

Which of the following statements best describes how nearsightedness is caused?

  • AObjects appear blurry because the lens is unable to change shape and refract the light.
  • BDistant objects appear blurry because the rays of light are focussed in front of the retina.
  • CNear objects appear blurry because the rays of light are focussed behind the retina.
  • DObjects appear blurry no matter how far away they are because the rays of light are focussed in front of the retina.
  • EDistant objects appear blurry because the rays of light are focussed behind the retina.

Q7:

Which of the following correctly describes how color blindness is caused?

  • AThe iris in the eye cannot distinguish between different colors.
  • BThe cornea is unable to refract different colors.
  • CThe lens in the eye cannot distinguish between different colors.
  • DCone cells in the eye cannot distinguish between different colors.
  • ERod cells in the eye cannot distinguish between different colors.

Q8:

Which of the following statements best describes how farsightedness is caused?

  • ANear objects appear blurry because the rays of light are focussed in front of the retina.
  • BNear objects appear blurry because the rays of light are focussed behind the retina.
  • CDistant objects appear blurry because the rays of light are focussed in front of the retina.
  • DObjects appear blurry because the lens is unable to change shape and refract the light.
  • EObjects appear blurry no matter how far away they are because the rays of light are focussed in front of the retina.

Q9:

Which of the following best describes how the eye focuses on objects that are near?

  • AThe ciliary muscles contract to make the lens thicker.
  • BThe ciliary muscles contract and the lens becomes thinner.
  • CThe ciliary muscles relax to make the lens thicker.
  • DThe ciliary muscles relax and the lens becomes thinner.

Q10:

What is the function of the cornea in the eye?

  • AThe cornea detects color.
  • BThe cornea protects the front of the eye and refracts light entering the eye.
  • CThe cornea transmits electrical impulses to the brain.
  • DThe cornea alters the shape of the lens.
  • EThe cornea controls the size of the pupil and, therefore, how much light enters the eye.

Q11:

What type of lens in glasses or contact lenses corrects farsightedness?

  • AA convex/converging lens
  • BA convex/diverging lens
  • CA concave/diverging lens
  • DA concave/converging lens

Q12:

What type of lens in glasses or contact lenses corrects nearsightedness?

  • AA concave/diverging lens
  • BA convex/diverging lens
  • CA convex/converging lens
  • DA concave/converging lens

Q13:

Which of the following best describes how the eye focuses on objects that are distant?

  • AThe ciliary muscles contract to make the lens thinner.
  • BThe ciliary muscles relax to make the lens thicker.
  • CThe ciliary muscles relax and the lens becomes thinner.
  • DThe ciliary muscles contract to make the lens thicker.

Q14:

Select the best statement that explains how laser eye surgery can be used to correct farsightedness or nearsightedness.

  • ALasers are used to change the shape or thickness of the retina.
  • BLasers are used to change the shape or thickness of the iris, so light is refracted onto the retina correctly.
  • CLasers are used to change the shape or thickness of the cornea, so light is refracted onto the retina correctly.
  • DLasers are used to change the shape or thickness of the cornea, so light is refracted onto the iris correctly.
  • ELasers are used to change the shape or thickness of the lens, so light is refracted onto the retina correctly.

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