Inclusion Criteria:  Aged 8-16 years Corrected visual acuity equal to lower than 6/18 and equal to or better than 3/60 with both eyes open Central vision loss or vision loss affecting the whole visual field Currently cared for by the Eye Department at Sheffield Children's Hospital Patient and parents/guardians fluent in verbal and written English No physical or cognitive difficulties which indicate the child or young person would struggle to use device or complete the study activities  Exclusion Criteria:  Aged <8 years or >17 years Corrected visual acuity not lower than 6/18 or equal to or better than 3/60 with both eyes open History of neurological conditions, such as epilepsy or seizures Children with a pacemaker or other implanted medical device Not currently cared for by the Eye Department at Sheffield Children's Hospital Patients or parents/guardian non-fluent in verbal and written English Physical or cognitive difficulties which indicate the child or young person would struggle to use device or complete the study activities