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Chapter 26: Q13CQ (page 955)

Propose a way to study the function of the rods alone, given they can sense light about 1000 times dimmer than the cones.

Short Answer

Expert verified

When we reduce light, the effect of the rod cells will increase in our vision.

Step by step solution

01

Rod cells and cone cells.

The main difference between rod cells and cone cells is that the rod cells are responsible for the vision under low light whereas the cone cells are responsible for the vision under higher light levels.

02

Sensitivity of rod cells and cone cells.

Since rod cells sense light 1000 times dimmer than cone cells, we can study a person’s vision in very dim light.

As we reduce the light, the effect of the rod cells will increase in our vision. So in this condition, we can do a different experiment to see how rod cells affect our vision.

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Most popular questions from this chapter

Repeat the previous problem for glasses that are 2.20 cm from the eyes.

You switch from an 1.40NA 60×oil immersion objective to an 1.40NA 60×oil immersion objective. What are the acceptance angles for each? Compare and comment on the values. Which would you use first to locate the target area on your specimen?

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

(a) The print in many books averages 3.50 mmin height. How high is the image of the print on the retina when the book is held 30.0 cmfrom the eye?

(b) Compare the size of the print to the sizes of rods and cones in the fovea and discuss the possible details observable in the letters. (The eye-brain system can perform better because of interconnections and higher order image processing.)

The power of a physician’s eyes is 53.0 D while examining a patient. How far from her eyes is the feature being examined?

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

What is the near point of a person whose eyes have an accommodated power of 53.5 D?
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