Answer:
See explanation
Step-by-step explanation:
An illustration of an eye chart for a physical exam would best give readers a clearer understanding of the text, as it mentions that the Pellegrini family and others had to undergo a rigorous physical examination, particularly of the eyes. This would include reading an eye chart to test visual acuity, which is the ability to see clearly at different distances. An illustration of an eye chart would help readers visualize this aspect of the physical exam described in the text.