Final answer:
Izzy's grandmother seems to be suffering from presbyopia, an age-related condition that affects near vision.
Step-by-step explanation:
Izzy's grandmother holding the book report at arm's length instead of closer to her eyes suggests that she is experiencing difficulties with her vision. The most common condition that causes this behavior is presbyopia, which is an age-related condition that affects near vision. As people get older, the lens of the eye becomes less flexible, making it harder for them to focus on close objects. This makes it necessary for them to hold reading materials at arm's length in order to see them clearly.