Focusing on the function:
* Seeing-eye dog: This is an older term for a guide dog, but it highlights the specific function of helping visually impaired people.
* Assistance dog: This is a broader term that encompasses guide dogs, but also includes dogs trained to help people with other disabilities.
* Unassisted: This simply means someone is not using a guide dog, but doesn't specify the reason.
* Unaided: Similar to "unassisted," but emphasizes the lack of assistance, implying the person is navigating independently.
Focusing on the absence of a dog:
* Human guide: This emphasizes the use of a human instead of a dog.
* Cane user: This specifically indicates someone using a cane for navigation.
Focusing on the opposite of helping:
* Obstacle: This emphasizes something that hinders a person's movement.
* Barrier: Similar to "obstacle," this focuses on something that prevents access or progress.
The best antonym will depend on the specific situation and the intended meaning.