Table 2 Summary of changes made to version one to create version two of the new instrument
Version one | Changes Made | Reason | Version two | ||
|---|---|---|---|---|---|
Section heading | No of items | Section heading | No of Items | ||
General vision | 10 | • ‘Blurred vision’ and ‘distortion’ merged | • High correlation 0.801 | General vision | 9 |
Distance vision | 4 | • All items replaced by general distance vision items ‘difficulty seeing far side of a room’ and ‘difficulty seeing far away’ | • 4 items in version 1 refer to specific tasks. ‘Bus numbers’ high N/A response | Distance vision | 2 |
Near vision | 7 | • Wording change in ‘recognising faces and seeing facial expressions’ to ‘seeing faces and facial expressions’ | • Original wording related to prosopagnosia | Near vision | 5 |
• ‘Doing work or hobbies’, ‘identifying coins and bank notes’, ‘telling time on a watch’ and ‘using a telephone’ replaced by new item ‘difficulty with close up vision’. | • 4 items in version 1 refer to specific tasks | ||||
• Addition of ‘difficulty using a computer’ item from television section | • Item relates to near vision | ||||
Reading | 4 | • ‘ordinary print’ ‘small print’ and ‘large print’ items replaced by ‘reading same size print as before’ | • New item isolates impact of new stroke related visual impairment | Reading | 2 |
Television | 4 | • ‘Watching television’ and ‘reading text on television’ removed used as example for ‘difficulty seeing far side of a room’ item in distance vision section | • Items related to distance vision activities | – | Section removed |
• ‘Watching a film at the cinema’ removed | • High N/A response 26.9% | ||||
• ‘Difficulty using a computer’ item reworded and moved to near vision section | • Item relates to near vision | ||||
Peripheral vision | 3 | No changes made | – | Peripheral vision | 3 |
Lighting | 5 | • ‘Adjusting to brightness from dim light’ and ‘adjusting to darkness from bright light’ combined to create ‘adjusting to differing lighting’ | • High correlation 0.810 | Light | 4 |
• ‘Haloes’ item removed | • Floor effect 44.2% reporting no issue and 11.5% N/A response | ||||
• Addition of ‘change in colour’ from colour section | |||||
Colour | 3 | • All items replaced by ‘change in colour’ item | • All items floor effects (‘recognising colour’ 70.2%, ‘picking out clothes’ 75.6%, ‘colours appear dull’ 62.1%) | – | Section removed |
• ‘Change in colour’ item moved to light section | • New item isolates impact of new stroke related visual impairment | ||||
Discomfort | 5 | • ‘Pain and discomfort’, ‘headaches’ and ‘eyes feeling strained’ items removed | • Difficult to attribute cause and therefore to answer accurately | Discomfort | 2 |
Walking | 9 | • ‘Steps, curbs and stairs’ item combined with ‘uneven ground’ item | • Similar situations | Moving around | 9 |
• ‘Tripping and falling’ and ‘bumping into’ items reworded | • Context added | ||||
• Walking replaced by moving around in all items | • Reworded to include mobilisation by other methods e.g. wheelchair | ||||
• Addition of ‘travelling as a passenger’ item from travelling section | • Now section not specific to walking | ||||
Driving | 7 | • All items removed | • Floor and ceiling effects all participants had either never driven or given up driving | – | Section removed |
Travelling | 3 | • ‘Travelling alone’ and ‘traveling on public transport’ items removed | • High correlations 0.786 and 0.761 with ‘travelling in a car as a passenger’ | – | Section removed |
• ‘Travelling in a car as a passenger’ reworded to incorporate ‘travelling on public transport’ and moved to moving around section | |||||
Socialising | 7 | • ‘Visiting family and friends’, ‘entertaining in your home’ and ‘making new friends’ items removed | • High correlations 0.773 and 0.776 identified duplication with ‘social activities’ | Socialising | 4 |
• Wording of the ‘social activities’ and the ‘outdoor activities’ items combined to create two items, ‘indoor social activities’ and ‘outdoor social activities’. | • Differentiation between indoor and outdoor activities | ||||
Role limitations | 6 | • ‘Performing usual activities’ and ‘people limiting your opportunities’ items removed | • High correlation 0.816 with ‘doing usual work to usual standard’ and N/A response 11.5% | Role limitations | 4 |
• ‘Doing usual work to usual standard’ and ‘limit of how long you can work’ reworded | |||||
• N/A response of not working/retired 11.5% | |||||
Self-care | 10 | No changes made | – | Independent living | 10 |
Well-being | 13 | • ‘Feeling sad and low’, ‘frustrated’, ‘anxious’, ‘worry’, ‘feeling isolated’, ‘feeling less control’ and ‘stressed’ combined into one item ‘negative emotions’ | • High correlations 0.810 to 0.929 | Well-being | 6 |
• High correlation 0.810 | |||||
• ‘Feeling a burden’ and ‘needing help from others’ combined into one item, ‘feeling a burden’ | |||||