The visual field is a tunnel about as wide as their shoulders and extending out about as far as their hands can reach, which is about 1 yard or metre in front of their face.
They may hold an object that is placed in their hand until it drops or falls out of their hand without being noticed.
Visitors can be encouraged to bring familiar things from home or outdoors. You will need to warn them that, even though it is rare within ACL 1, people do put anything that is in their hands into their mouths unexpectedly.