Participant demographics across review studies (experimental)
| Mean age | Gender | Nationality (ethnicity) | Vision impairments |
| 51 years | 40 Females 40 Males | Chinese | Diabetic retinopathy |
| 55.8 years | 17 Females 14 Males | German | Open angle glaucoma |
| 17 years | Female | American | Blind |
| 5 years | 1 Female 5 Males | American | Blindness ranging from: one prosthetic eye, bilateral retinoblastoma nystagmus, cortical visual impairment |