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 detects color.
  • DThe iris controls the size of the pupil and, therefore, how much light enters the eye.
  • EThe iris protects the front of the eye and refracts light entering the eye.

Q2:

What is the function of the ciliary muscles?

  • ADetect colors
  • BProtect the front of the eye and refract light entering the eye
  • CControl the size of the pupil and therefore how much light enters the eye
  • DTransmit electrical impulses to the brain
  • EAlter the shape of the lens

Q3:

Which of the following statements about the retina is incorrect?

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

Q4:

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

  • AIn bright light, the muscles in the iris relax and constrict 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 contract and dilate the pupil.

Q5:

What is a cataract?

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

Q6:

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

  • AObjects appear blurry no matter how far away they are because the rays of light are focussed in front of the retina.
  • BDistant objects appear blurry because the rays of light are focussed in front of the retina.
  • CObjects appear blurry because the lens is unable to change shape and refract the light.
  • DNear objects appear blurry because the rays of light are focussed behind 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 lens in the eye cannot distinguish between different colors.
  • BThe cornea is unable to refract different colors.
  • CRod cells in the eye cannot distinguish between different colors.
  • DCone cells in the eye cannot distinguish between different colors.
  • EThe iris 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 behind the retina.
  • BDistant objects appear blurry because the rays of light are focussed in front of the retina.
  • CObjects appear blurry no matter how far away they are because the rays of light are focussed in front of the retina.
  • DNear objects appear blurry because the rays of light are focussed in front of the retina.
  • EObjects appear blurry because the lens is unable to change shape and refract the light.

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 relax to make the lens thicker.
  • CThe ciliary muscles contract and the lens becomes thinner.
  • 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 controls the size of the pupil and, therefore, how much light enters the eye.
  • DThe cornea transmits electrical impulses to the brain.
  • EThe cornea alters the shape of the lens.

Q11:

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

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

Q12:

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

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

Q13:

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

  • AThe ciliary muscles relax and the lens becomes thinner.
  • BThe ciliary muscles contract to make the lens thinner.
  • CThe ciliary muscles contract to make the lens thicker.
  • DThe ciliary muscles relax 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 lens, 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 retina correctly.
  • ELasers are used to change the shape or thickness of the cornea, so light is refracted onto the iris correctly.

Q15:

The diagram provided shows the structure of the eye.

What part of the eye is represented by label 1?

  • ALens
  • BOptic nerve
  • CRetina
  • DSuspensory ligament
  • EIris

What part of the eye is represented by label 2?

  • AOptic nerve
  • BIris
  • CSuspensory ligament
  • DRetina
  • ELens

What part of the eye is represented by label 3?

  • AOptic nerve
  • BRetina
  • CLens
  • DSuspensory ligament
  • EIris

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