Final answer:
The diagnosis of strabismus is confirmed by a crossed appearance of the eyes and impaired extraocular muscles, in addition to the inability to focus on an object with both eyes simultaneously.
Step-by-step explanation:
Strabismus is a condition where the eyes are misaligned and do not properly focus on the same object. In addition to the child being unable to focus on an object with both eyes simultaneously, other findings that confirm the diagnosis of strabismus include a crossed appearance of the eyes and impaired extraocular muscles. Impaired near vision and degeneration of the central retina are not specific findings for strabismus.