Solution
We can do the following plots:
Outliers represent values that are too low or to high compared to the other values in a dataset
Doctor a
From the info given we can consider as outliers the Points:
Corr. Glasses Contacts
726 634 92
769 670 99
Since are values too low compared to the remaning values
Doctor b
Corr. Glasses Contacts
759 624 135
Since is a point higher compared to the remaining values