Around-the-Head Tactile System for Supporting Micro Navigation of People with Visual Impairments

2021 ◽  
Vol 28 (4) ◽  
pp. 1-35
Author(s):  
Oliver Beren Kaul ◽  
Michael Rohs ◽  
Marc Mogalle ◽  
Benjamin Simon
Keyword(s):  
Low Vision ◽  
Optimal Path ◽  
Visual Impairments ◽  
Navigation Systems ◽  
Average Absolute Deviation ◽  
Absolute Deviation ◽  
Order Of Magnitude ◽  
Tactile Navigation ◽  
Tactile System

Tactile patterns are a means to convey navigation instructions to pedestrians and are especially helpful for people with visual impairments. This article presents a concept to provide precise micro-navigation instructions through a tactile around-the-head display. Our system presents four tactile patterns for fundamental navigation instructions in conjunction with continuous directional guidance. We followed an iterative, user-centric approach to design the patterns for the fundamental navigation instructions, combined them with a continuous directional guidance stimulus, and tested our system with 13 sighted (blindfolded) and 2 blind participants in an obstacle course, including stairs. We optimized the patterns and validated the final prototype with another five blind participants in a follow-up study. The system steered our participants successfully with a 5.7 cm average absolute deviation from the optimal path. Our guidance is only a little less precise than the usual shoulder wobbling during normal walking and an order of magnitude more precise than previous tactile navigation systems. Our system allows various new use cases of micro-navigation for people with visual impairments, e.g., preventing collisions on a sidewalk or as an anti-veering tool. It also has applications in other areas, such as personnel working in low-vision environments (e.g., firefighters).

scholarly journals The functional ability of older adults with visual impairments: A 2-year follow-up study

2021 ◽  
pp. 026461962199188
Author(s):  
Kaisa-Mari Mirjam Saarela ◽  
Ulla Jämsä ◽  
Aura Falck ◽  
Helvi Kyngäs ◽  
Heidi Johanna Siira
Keyword(s):  
Older Adults ◽  
Functional Ability ◽  
Low Vision ◽  
Visual Impairments ◽  
Standard Of Care ◽  
International Classification Of Functioning ◽  
Personal Hygiene ◽  
Homogeneity Test ◽  
Low Vision Rehabilitation

This study describes the self-estimated functional ability of older adults with visual impairments (VI) living at home prior to and after 24 months of individual low vision rehabilitation (LVR) according to the International Classification of Functioning, Disability and Health (ICF) framework. The LVR was carried out according to regular standard of care in Finland. The study provides knowledge that is relevant for improving both LVR as well as other services for older adults living with VI. Thirty-nine older adults with VI initially participated in the study with 28 remaining for the follow-up at 24 months of LVR. Data were collected by an orally administered questionnaire including items from the Oldwellactive Wellness Profile instrument. Data were analyzed using the marginal homogeneity test, and the outcomes were divided into four categories according to the ICF framework. Comparisons between the baseline and 2-year follow-up revealed statistically significant decreases in daily functions, including going outdoors ( p = .011), washing oneself ( p = .016), taking care for personal hygiene ( p = .046), dressing ( p = .034), preparing meals ( p = .041), and doing heavy housework ( p = .046), following 2 years of received LVR. A statistically significant increase in the need for help was also observed during the study period ( p = .025). The independence of older adults with VI decreased, and the need for external services or help increased during 24 months after the onset of receiving LVR. Visual problems were shown to widely affect functional ability. Activities and participation dimension together with loneliness are most affected and need attention in individual LVR.

scholarly journals The Relationship Between the Home Environment and Falls for Older Adults With Visual Impairments

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 770-770
Author(s):  
Bonnielin Swenor ◽  
Aleksandra Mihailovic ◽  
Pradeep Ramulu
Keyword(s):  
Older Adults ◽  
Home Environment ◽  
Visually Impaired ◽  
Visual Impairments ◽  
Fold Increase ◽  
Engineering Society ◽  
Environment Assessment ◽  
Risk Factors For Falls ◽  
The Relationship

Abstract The home environment and features of the home have been identified as important risk factors for falls, and may pose particular risk for older adults with visual impairments given difficulty with hazard perception. We used data from 245 participants in the Falls in Glaucoma Study [mean age: 71 years, mean follow-up: 31 months] with homes graded using our previously validated Home Environment Assessment for the Visually Impaired (HEAVI), which quantifies the number of in-home fall-related hazards and found that neither the number of hazards nor the percentage of hazardous items were associated falls/year. However, each 10-fold increase in lighting was associated with a 35% lower rate of falls/year (RR=0.65, 95%CI=0.46 to 0.92) and there was a 50% reduction in falls/year when lighting was at or above 30 footcandles (minimum lighting level recommended by the Engineering Society of North America) compared to lighting <30 footcandles (RR=0.50, 95%CI=0.26 to 0.96).

Low Vision Services in an Agency: Structure and Philosophy

1975 ◽  
Vol 69 (6) ◽  
pp. 241-248
Author(s):  
Eleanor E. Faye ◽  
Clare M. Hood
Keyword(s):  
New York ◽  
Low Vision ◽  
Medical Director ◽  
The Other ◽  
Special Services ◽  
Full Discussion ◽  
Loan System ◽  
Training Services ◽  
And Training

The development and present structure of the comprehensive Low Vision Service of the New York Association for the Blind are used as the basis for a full discussion of the operation of such a clinical service, including its positive and negative features. The clinic is administered by a medical director and by an administrator who coordinates the work of a staff consisting of ophthalmologists, optometrists, low vision assistants, volunteers, registrar, and receptionist. A separate Optical Aids Service stocks low vision aids which it sells by prescription to clinics, doctors, and patients within and without the agency. Referrals for special services are made to the other departments of the agency. Also described are the low vision examination itself, follow-up and training services, and the aid loan system.

A Survey of Blind Orientation and Mobility Specialists about the Accommodations and Teaching Strategies They Use when Providing Orientation and Mobility Services

2021 ◽  
pp. 0145482X2110180
Author(s):  
Nora Griffin-Shirley ◽  
Laura Bozeman ◽  
The Nguyen ◽  
Vitalis Othuon ◽  
Anita Page ◽  
...  
Keyword(s):  
Visually Impaired ◽  
Online Survey ◽  
Low Vision ◽  
Visual Impairments ◽  
Teaching Techniques ◽  
Preparation Programs ◽  
Self Advocacy ◽  
Blind And Visually Impaired ◽  
Orientation And Mobility ◽  
Immersion Training

Introduction: The purpose of the study was to survey orientation and mobility (O&M) instructors who are blind concerning the identification of accommodations, teaching techniques, and resources to teach students with visual impairments (i.e., blindness or low vision). Methods: The study utilized an online survey via Qualtrics (2019) with 27 closed- and open-ended items to identify accommodations, teaching techniques, and resources needed. The survey was e-mailed to membership and certification organizations requesting O&M instructors who are blind to participate for 12 weeks. The participants were 15 O&M specialists, mostly male and Caucasian. Survey data were then analyzed using descriptive statistics. Results: Forty percentage of the participants reported that there were minimal standards that they had to demonstrate prior to their admittance into an O&M program. About one-fourth of the participants mentioned their program was modified because of their visual impairment. Eleven participants (73%) reported that their nonvisual instructional strategies and techniques were predominantly gained through their university programs or other visually impaired instructors (27%, n = 4). Discussion: Aspects of this study that are similar to the current literature are smaller faculty-to-student ratios for blindfold or simulation cane courses, accommodations used by participants, and suggestions for monitoring the safety of students. The results revealed the participants’ strong belief in the importance of immersion training, the use of the Structured Discovery Cane Travel (SDCT), nonvisual skills during O&M instruction, sleep shades, and students’ problem-solving abilities. Implication for practitioners: Although the participants had received SDCT immersion training, most personnel preparation programs approved by the Association for the Education and Rehabilitation of Blind and Visually Impaired do not use this method. For this reason, it is important for faculty to identify best teaching practices from among all programs and to integrate these practices into their curricula. Sharing best practices could strengthen all programs. Moreover, students with visual impairments should be taught early about self-advocacy and the ability to have helpful knowledge about one’s skills at a university and in the workplace.

scholarly journals Exploring the role of an emotional support and counselling service for people with visual impairments

2013 ◽  
Vol 31 (1) ◽  
pp. 5-19 ◽  
Author(s):  
Suzanne Hodge ◽  
Wally Barr ◽  
Louise Bowen ◽  
Martina Leeven ◽  
Paul Knox
Keyword(s):  
Emotional Support ◽  
Service Providers ◽  
Low Vision ◽  
Visual Impairments ◽  
Well Being ◽  
Service Users ◽  
Social Changes ◽  
Psychological Well Being ◽  
Mixed Methods Evaluation

There is growing evidence of the need for services to address the emotional support needs of people with visual impairments. This article presents findings from a mixed methods evaluation of an emotional support and counselling (ESaC) service delivered within an integrated low vision service, focusing primarily on the qualitative findings. Data collected using a standardised measure of psychological well-being (Clinical Outcomes in Routine Evaluation–Outcome Measure; CORE-OM) show an improvement in the psychological well-being of clients of the service between baseline and follow-up assessment. Qualitative findings from interviews with service users and service providers help to illustrate and explain the experiences underlying the quantitative findings. The ESaC services are shown to be helpful to service users in two particular ways: helping them to normalise their experiences by talking to an impartial listener and helping them to accept and adapt to the physical, emotional and social changes in their lives resulting from their visual impairment.

Solubility of the pesticide diuron in organic nonelectrolyte solvents. Comparison of observed vs. predicted values based upon Mobile Order theory

2000 ◽  
Vol 78 (2) ◽  
pp. 184-190 ◽  
Author(s):  
Karina M De Fina ◽  
Tina L Sharp ◽  
Michael A Spurgin ◽  
Ivette Chuca ◽  
William E Acree, Jr. ◽  
...  
Keyword(s):  
Order Theory ◽  
Average Absolute Deviation ◽  
Absolute Deviation ◽  
Solubility Predictions ◽  
Mobile Order Theory ◽  
Dimethyl Urea ◽  
Organic Nonelectrolyte ◽  
Predicted Values ◽  
Alcohol Solvents ◽  
Mobile Order

Experimental solubilities are reported at 25.0°C for diuron (also called 3-(3,4-dichlorophenyl)-1,1-dimethyl urea) dissolved in 49 different organic nonelectrolyte solvents containing ether-, chloro-, hydroxy-, ester-, methyl-, and tert-butyl-functional groups. Results of these measurements are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 28 nonalcoholic solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is 60.1%. Diuron solubilities in the alcohol solvents are used to calculate stability constants for presumed solute-solvent hydrogen bonds that are believed to occur in solution.Key words: pesticide, diuron solubilities, organic nonelectrolyte solvents, solubility predictions.

The Expanded Core Curriculum Areas Experienced by Campers during Camp Abilities: A Qualitative Study

2021 ◽  
Vol 115 (1) ◽  
pp. 28-41
Author(s):  
Lauren J. Lieberman ◽  
Katie Ericson ◽  
Maria Lepore-Stevens ◽  
Karen Wolffe
Keyword(s):  
Focus Group ◽  
Independent Living ◽  
Core Curriculum ◽  
Low Vision ◽  
Visual Impairments ◽  
Structured Learning ◽  
Focus Group Discussions ◽  
Group Discussions ◽  
Expanded Core Curriculum ◽  
Children With Visual Impairments

Introduction: The expanded core curriculum (ECC) refers to the generally accepted nine areas of instruction that children who are visually impaired (i.e., those who are blind or have low vision) must learn through explicit instruction in order to live independently as adults. Children with visual impairments must experience immersion in the ECC in their daily lives throughout the year rather than only being taught these skills during the school year by teachers of students with visual impairments. Therefore, this research was undertaken to determine whether athletes attending Camp Abilities, a sports camp for children with visual impairments, experienced new ECC skills or practiced previously learned ECC skills and if so, how. Method: Researchers chose to interview 10 athletes from a purposeful sample of 30 children who had previously attended camp. The 10 coaches who worked with these athletes one-on-one participated in focus group discussions at the end of the weeklong camp. In addition, all athletes and coaches attending camp listed their thoughts on posters describing how all athletes attending experienced areas of the ECC. Finally, researchers documented observations of athletes’ opportunities to practice ECC content throughout the weeklong program. Researchers transcribed interviews and focus group discussions and reviewed for themes relating to ECC areas that were part of the students’ lived experience during camp. Results: Three major conclusions emerged from reviews of the interviews, discussion group transcripts, posters, and observations: (1) athletes and coaches were initially unclear about what the ECC areas were and how the athletes experienced the ECC in their everyday academic and home activities; (2) following clarification of the ECC areas, the athletes came to recognize how they learned and applied ECC skills during the camp experience; and (3) a more structured instructional approach to applying the ECC at camp may further enhance their experiences. Discussion: The youth participants were not able to list and describe all of the ECC areas when interviewed at the end of camp. However, adult participants (coaches) listed most ECC areas and described how athletes experienced the ECC during camp in their focus group discussions. Once researchers clarified ECC areas for athletes, they identified self-determination, recreation and leisure, social interaction, and independent living as the areas of the ECC most often experienced during camp. Implications for practitioners: Practitioners need to pay attention to structured learning of the ECC areas and consider articulating for students which areas overlap in their everyday lives, so that they are fully aware of the multiple skills they are acquiring. Camp Abilities is a functional way for youths with visual impairments to experience all areas of the ECC.

Effects of a Disability Simulation Activity on the Achievement, Efficacy, Attitudes, and Interests of Preservice Professionals

2021 ◽  
pp. 0145482X2110466
Author(s):  
Alexandra Hollo ◽  
Carla B. Brigandi ◽  
Casey M. Jelsema ◽  
Mingming Shi
Keyword(s):  
Visual Impairment ◽  
Skill Acquisition ◽  
Professional Education ◽  
Low Vision ◽  
Visual Impairments ◽  
Cluster Randomized Trial ◽  
Single Class ◽  
Related Services ◽  
Disability Simulation ◽  
Experimental Group

Introduction: Disability simulation activities are commonly used for various purposes in higher education; however, instructors may be unaware of controversies regarding their use. The purpose of this research was to assess the effects of an activity using low vision goggles to simulate visual impairment in the context of an undergraduate course in special education. We highlight the need for instructors to consider the appropriateness of disability simulation activities given possible countertherapeutic effects. Methods: In this cluster-randomized trial, 11 classes (248 students) of preservice education and related services professionals were randomized to experimental (lecture + simulation) or control (lecture only) conditions. During a single class session, all students received basic information about visual impairment and watched a video on being a human guide. Students in the experimental group then practiced guiding and being guided while wearing low vision goggles. At the end of class, students completed three Likert-type surveys and later completed a quiz using publisher-developed materials. Results: Results showed individuals in the experimental group reported higher levels of interest and enjoyment than those in the control condition; however, there were no statistically significant differences in attitudes toward persons with visual impairments, confidence or self-efficacy for working with students with visual impairments, content knowledge, or perceptions of activity usefulness. Discussion: Findings of positive engagement in the absence of harmful effects indicate that disability simulation activities should be neither promoted nor denigrated wholesale; instead, instructors must weigh carefully potential benefits and drawbacks. Discussion includes considerations for professional education programs in using such simulations to promote skill acquisition via positive and respectful learning experiences. Implications for practitioners: Instructors who use disability simulation activities are encouraged to consider whether to discontinue this practice or incorporate principles recommended by the disability community and assess outcomes to ensure they are not perpetuating harmful stereotypes.

scholarly journals Overall efficacies of combined measures for controlling grape bunch rot can be estimated by multiplicative consideration of individual effects

OENO One ◽  
2017 ◽  
Vol 51 (4) ◽  
pp. 401-407 ◽  
Author(s):  
Daniel Molitor ◽  
Lucien Hoffmann ◽  
Marco Beyer
Keyword(s):  
Disease Severity ◽  
Goodness Of Fit ◽  
Control Measures ◽  
Average Absolute Deviation ◽  
Absolute Deviation ◽  
Additional Measure ◽  
Severity Level ◽  
Bunch Rot ◽  
The Individual ◽  
Disease Severity Level

Aims: The present analyses aimed at evaluating the performance of two models for estimating the overall effect of combining two or more measures (leaf removal, cluster division, late shoot topping, botryticide application, bioregulator application) for controlling grape bunch rot based on the efficacy of the individual measures.Methods and results: Field trials with the white Vitis vinifera cultivars Pinot gris and Riesling on the efficacy of three bunch rot control measures applied either alone or in combination were analyzed. Bunch rot disease severities prior to harvest were assessed and efficacies were calculated for each treatment. Observed efficacies of single measures were used to estimate the overall efficacies of all possible measure combinations. Calculated efficacies matched observed efficacies more accurately when assuming multiplicative interaction among the individual measures (R2 = 0.8574, p < 0.0001; average absolute deviation: 7.9%) than in case of assuming additive effects (R2 = 0.8280; average absolute deviation: 14.7%).Conclusions: The multiplicative approach assumes that each additional measure is affecting (in case of efficient measures: reducing) the disease severity level as the result of the additional treatments rather than compared to the disease severity level in the untreated control.Significance and impact of the study: The high goodness of fit as well as the observed low deviations between the estimated and the observed efficacies suggest that the multiplicative approach is appropriate for estimating the efficacy of combined viticultural measures in a complex practical bunch rot control strategy assembled of different modules.

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