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The goal of this study is to learn if contrast frequency on step tread-edges influences foot clearance measures, a marker of fall risk, in older adults with and without visual impairments.
The main questions that aim to be answered are how foot clearance measures change across different frequencies of stair contrast, and how experiences and perceptions of different stair contrast frequencies are evaluated.
Researchers will compare individuals with and without visual impairments to see if contrast frequency on step tread-edges changes.
Participants will attend one visit during which their vision will be measured, and they will be asked to ascend and descend laboratory stairs at different contrast frequencies.
An optional second visit will entail a focus group meeting to better understand how contrast affects mobility in their home and everyday life.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Intervention | Experimental | All participants will participate in the experimental arm, that involves a factorial model approach inwhich all participants will experience all eight conditions. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Frequency of contrast marking on stair steps | Other | Frequency of contrast marking on stair steps will be evaluated to determine how foot clearance, perceptions in older adults with and without impaired contrast sensivity |
| Measure | Description | Time Frame |
|---|---|---|
| Toe clearance | Toe, foot vertical clearance on stair steps | visit 1, through study completion, an average of 1 year |
| Heel clearance | heel, foot horizontal clearance on stair steps | visit 1, through study completion, an average of 1 year |
| Frequency of <5mm toe clearances | how often <5mm toe clearances occur | visit 1, through study completion, an average of 1 year |
| Frequency of <5mm heel clearances | how often <5mm toe clearances occur | visit 1, through study completion, an average of 1 year |
| Measure | Description | Time Frame |
|---|---|---|
| Likert-Scale responses of contrast marking frequency conditions | 5-point range from strongly dislike to strongly like | visit 1, through study completion, an average of 1 year |
| Perception responses of contrast marking frequency conditions |
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Inclusion Criteria:
≥ Contrast sensitivity log 1.6 or greater
travels independently in the community, including stairways > two times/week
comfortable ascending and descending a stairway with rest time provided
Exclusion Criteria:
severe rheumatologic and or orthopedic diseases (e.g., awaiting joint replacement, active inflammatory disease)
lower-limb injuries and/or recent joint replacements (e.g., hip fracture, hip, or knee replacement within six months of study enrollment)
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Sara A Harper, PhD | Contact | 2568242184 | sah0075@uah.edu |
| Name | Affiliation | Role |
|---|---|---|
| Sara A Harper, PhD | University of Alabama in Huntsville | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Alabama in Huntsville | Recruiting | Huntsville | Alabama | 35899 | United States |
We will archive our deidentified metadata to the Inter-University Consortium for Political and Social Research (ICPSR).
The IDP will be made available within 6 months after publication, and will be made publicly available for 3 years.
Access will be monitored through ICPSR.
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| ID | Term |
|---|---|
| D015354 | Vision, Low |
| D051346 | Mobility Limitation |
| ID | Term |
|---|---|
| D014786 | Vision Disorders |
| D012678 | Sensation Disorders |
| D009461 | Neurologic Manifestations |
| D009422 | Nervous System Diseases |
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Four contrast frequency conditions by two lighting conditions (N = 8) will be evaluated. The four frequencies are (1) contrast markings added to all steps, (2) contrast markings added to the first, last step, (3) contrast markings added to the first, two and last, two steps, (4) no contrast markings on stairs, in both low light and standard lighting conditions
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Collected via auditory responses
| visit 1, through study completion, an average of 1 year |
| D005128 |
| Eye Diseases |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |