An observational pilot study comparing responses to short naturalistic video tasks in adults with cerebral visual impairment and control participants to investigate visual processing, stress, fatigue, and visual scene extraction
Cerebral visual impairment (CVI)
Participants with cerebral visual impairment and control participants with typical vision will undergo ophthalmological screening assessment and structured question inventory assessment prior to participation. Participants will then view eight short naturalistic videos depicting everyday visual environments including shops, beaches, and driving scenes. Participants will describe aloud what they can see while viewing each video. Following each video, participants will complete structured questionnaire measures relating to visual difficulty, stress, mental fatigue, and visual fatigue. Quantitative and qualitative data including questionnaire responses, verbal descriptions, timing measures, and visual instance scoring will be analysed to compare visual processing profiles between adults with cerebral visual impairment and control participants.
Adults with CVI group: 1. Established NHS diagnosis of cerebral visual impairment 2. Sufficient visual acuity to undertake the video tasks 3. Features consistent with dorsal stream dysfunction based on structured question inventory and ophthalmological assessment Control group: 1. Correctable typical visual acuity 2. No diagnosis of cerebral visual impairment 3. No evidence of features suggestive of cerebral visual impairment based on structured question inventory and ophthalmological assessment
1. Significant uncorrected visual impairment preventing participation in the video tasks 2. Inability to complete the structured video viewing and question procedures For control participants: 1. Any evidence suggestive of cerebral visual impairment or dorsal stream dysfunction based on ophthalmological assessment and structured question inventory