Question

How do you establish the correct distance from the tube tip to the vermilion border?

a) Measure with a ruler
b) Refer to a medical chart
c) Use anatomical landmarks
d) Trial and error

Answer 1

To establish the correct distance from the tube tip to the vermilion border, you can use anatomical landmarks.

Step-by-step explanation:

The correct distance from the tube tip to the vermilion border can be established using anatomical landmarks. Here is a step-by-step process:

1. Stretch your arm forward and extend your thumb, so that your thumbnail faces your eyes.
2. Close one eye and move your thumb so that, looking with your open eye, you see your thumbnail covering the landmark A.
3. Then open the eye you had closed and close the one with which you looked before, without moving your thumb. It will now appear that your thumbnail has moved: it is no longer in front of landmark A, but in front of some other point at the same distance.
4. Estimate the true distance AB by comparing it to the estimated heights of trees, widths of buildings, distances between power-line poles, lengths of cars etc. The distance to the landmark is 10 times the distance AB.