First Steps in Vision

Select the BEST response alternative for each of the questions below.

1. Light can be described as a stream of photons or:
A) as a signal.
B) as a wave.
C) as a source.
D) as an outlet of energy.
E) as an illuminant.
2. Light cannot be:
A) absorbed.
B) refracted.
C) dissolved.
D) transmitted.
E) scattered.
3. The retina:
A) is the tough outer covering that protects the eye.
B) contains watery fluid.
C) focuses the image.
D) diffracts light.
E) contains rods and cones.
4. Which of the following does not require optical correction to see normally?
A) Myopia.
B) Hyperopia.
C) Astigmatism.
D) Emmetropia.
E) All of the above require optical correction.
5. Which of the following is a unit of measurement of the optic power of a lens?
A) Diopter.
B) Visual angle.
C) Accommodation.
D) Hertz.
E) Wavelength.
6. The retina is analogous to the ________ in a camera.
A) lens
B) stop
C) flash
D) film
E) shutter
7. Eye doctors use an instrument called an ophthalmoscope to look at the ________ of their patientsí eyes.
A) cornea
B) iris
C) lens
D) focal point
E) fundus
8. The term ________ refers to the distance between the location of a retinal image and the fovea.
A) degradation
B) density
C) circularity
D) eccentricity
E) signal strength
9. The part of the photoreceptor that contains photopigment molecules is called the:
A) retina.
B) outer segment.
C) inner segment.
D) synaptic terminal.
E) vitreous humor.
10. The visual pigment found in rods is called:
A) macular pigment.
B) aqueous humor.
C) rhodopsin.
D) chromopsin.
E) vitreous humor.
11. Which of the following is a specialized retinal cell responsible for lateral inhibition?
A) Cortical cell.
B) Bipolar cell.
C) Ganglion cell.
D) Horizontal cell.
E) Photoreceptor.
12. Retinal cells that make connections with bipolar cells, ganglion cells, and other cells like themselves are called:
A) amacrine cells.
B) cones.
C) horizontal cells.
D) chromophores.
E) rods.
13. Which of the following are retinal cells that synapse with photoreceptors, horizontal cells, and ganglion cells?
A) Amacrine cells.
B) Bipolar cells.
C) Chromophores.
D) Cones.
E) Rods.
14. The lateral pathway in the retina consists of all of the following except:
A) photoreceptors.
B) amacrine cells.
C) horizontal cells.
D) ganglion cells.
E) Both (a) and (d).
15. P ganglion cells are different than M ganglion cells in that P ganglion cells:
A) have larger receptive fields than M ganglion cells do.
B) are more sensitive to motion than M ganglion cells are.
C) synapse with more photoreceptors than M ganglion cells do.
D) operate better in low-light conditions than M ganglion cells do.
E) are more sensitive to color than M ganglion cells are.

End of Quiz!

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The correct answers are marked by a "C" in the box before each question. The incorrect questions are marked by an "X".