TABLE 3.
Qualitative usability results of thinking aloud protocol.
| Task | Problem | Solution | N.S. |
| Use of cardboard | |||
| Wear cardboard | None | None | – |
| Remove cardboard | Sense of annoyance/sense of falling after removing the cardboard | Encourage the patient to keep his/her eyes open to avoid falling | 1 |
| Instructions | |||
| Listening | None | None | – |
| Comprehension | None | None | – |
| Familiarization | |||
| Listening | None | None | – |
| Comprehension | None | None | - |
| Execution | Blurry image | Improve the quality of VR video | 1 |
| Encoding | |||
| Listening | None | None | – |
| Comprehension | None | None | – |
| Execution | Difficulty to explore the environment in an appropriate order | Improve instructions’ clarity | 5 |
| Encourage to listen carefully the instructions | |||
| Unclear image | Improve the quality of images | 4 | |
| Name all the objects | Improve instructions’ clarity | 1 | |
| Difficulty to find the initial object labeled | Improve the instructions | 4 | |
| Nausea | Provide slower execution of the exercise | 1 | |
| Recognition | |||
| Listening | None | None | – |
| Comprehension | None | None | – |
| Execution | Dizziness | Provide slower execution of the exercise | 1 |
| Recognizes many distractors caused by blurry image | Improve the quality of images | 1 | |