The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Martin Rubinstein - One of the best experts on this subject based on the ideXlab platform.
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the Low Vision distance telescope how useful an Aid
Ophthalmic and Physiological Optics, 1997Co-Authors: Martin Rubinstein, John LoweAbstract:It is axiomatic that success in the use of any Low Vision Aid depends largely upon the user's qualities of adaptability and skill. Distance telescopic Aids, in particular, produce images with characteristics that are especially demanding of these qualities. Although patients appear largely content to accept their distance telescopes, a survey of individual successes and failures has not been reported. In the Low Vision service at University Hospital, Nottingham, 2695 patients were examined over a nine year period (January 1987–December 1995). Of these, 142 patients (5.3%) were supplied with distance telescopes. This sample consisted of 83 males and 59 females. The age range was between 9–91 years. A total of 9 patients had returned their telescopes because they no longer needed them. The remaining 133 patients were mailed a pilot questionnaire, aimed at evaluating their use of the telescope. Respondents to this were mailed a second, more detailed questionnaire, designed to examine in greater detail the individual's use of the appliance, their satisfaction with its performance etc. A total of 74/133 patients (56%) returned detailed questionnaires completed with quantifiable information. Statistical analysis showed: 1. Patients who found the telescopes easiest to use tended to use them most frequently 2. Monocularity tended to become commoner with age But, adaptability and skill did not appear significantly compromised by: 3. Increasing age 4. Monocularity/binocularity status. Fuller details of the results of this survey will be given in the poster.
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The Low Vision distance telescope‐‐how useful an Aid?
Ophthalmic and Physiological Optics, 1997Co-Authors: Martin Rubinstein, John B. LoweAbstract:It is axiomatic that success in the use of any Low Vision Aid depends largely upon the user's qualities of adaptability and skill. Distance telescopic Aids, in particular, produce images with characteristics that are especially demanding of these qualities. Although patients appear largely content to accept their distance telescopes, a survey of individual successes and failures has not been reported. In the Low Vision service at University Hospital, Nottingham, 2695 patients were examined over a nine year period (January 1987–December 1995). Of these, 142 patients (5.3%) were supplied with distance telescopes. This sample consisted of 83 males and 59 females. The age range was between 9–91 years. A total of 9 patients had returned their telescopes because they no longer needed them. The remaining 133 patients were mailed a pilot questionnaire, aimed at evaluating their use of the telescope. Respondents to this were mailed a second, more detailed questionnaire, designed to examine in greater detail the individual's use of the appliance, their satisfaction with its performance etc. A total of 74/133 patients (56%) returned detailed questionnaires completed with quantifiable information. Statistical analysis showed: 1. Patients who found the telescopes easiest to use tended to use them most frequently 2. Monocularity tended to become commoner with age But, adaptability and skill did not appear significantly compromised by: 3. Increasing age 4. Monocularity/binocularity status. Fuller details of the results of this survey will be given in the poster.
John B. Lowe - One of the best experts on this subject based on the ideXlab platform.
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The Low Vision distance telescope‐‐how useful an Aid?
Ophthalmic and Physiological Optics, 1997Co-Authors: Martin Rubinstein, John B. LoweAbstract:It is axiomatic that success in the use of any Low Vision Aid depends largely upon the user's qualities of adaptability and skill. Distance telescopic Aids, in particular, produce images with characteristics that are especially demanding of these qualities. Although patients appear largely content to accept their distance telescopes, a survey of individual successes and failures has not been reported. In the Low Vision service at University Hospital, Nottingham, 2695 patients were examined over a nine year period (January 1987–December 1995). Of these, 142 patients (5.3%) were supplied with distance telescopes. This sample consisted of 83 males and 59 females. The age range was between 9–91 years. A total of 9 patients had returned their telescopes because they no longer needed them. The remaining 133 patients were mailed a pilot questionnaire, aimed at evaluating their use of the telescope. Respondents to this were mailed a second, more detailed questionnaire, designed to examine in greater detail the individual's use of the appliance, their satisfaction with its performance etc. A total of 74/133 patients (56%) returned detailed questionnaires completed with quantifiable information. Statistical analysis showed: 1. Patients who found the telescopes easiest to use tended to use them most frequently 2. Monocularity tended to become commoner with age But, adaptability and skill did not appear significantly compromised by: 3. Increasing age 4. Monocularity/binocularity status. Fuller details of the results of this survey will be given in the poster.
John Lowe - One of the best experts on this subject based on the ideXlab platform.
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the Low Vision distance telescope how useful an Aid
Ophthalmic and Physiological Optics, 1997Co-Authors: Martin Rubinstein, John LoweAbstract:It is axiomatic that success in the use of any Low Vision Aid depends largely upon the user's qualities of adaptability and skill. Distance telescopic Aids, in particular, produce images with characteristics that are especially demanding of these qualities. Although patients appear largely content to accept their distance telescopes, a survey of individual successes and failures has not been reported. In the Low Vision service at University Hospital, Nottingham, 2695 patients were examined over a nine year period (January 1987–December 1995). Of these, 142 patients (5.3%) were supplied with distance telescopes. This sample consisted of 83 males and 59 females. The age range was between 9–91 years. A total of 9 patients had returned their telescopes because they no longer needed them. The remaining 133 patients were mailed a pilot questionnaire, aimed at evaluating their use of the telescope. Respondents to this were mailed a second, more detailed questionnaire, designed to examine in greater detail the individual's use of the appliance, their satisfaction with its performance etc. A total of 74/133 patients (56%) returned detailed questionnaires completed with quantifiable information. Statistical analysis showed: 1. Patients who found the telescopes easiest to use tended to use them most frequently 2. Monocularity tended to become commoner with age But, adaptability and skill did not appear significantly compromised by: 3. Increasing age 4. Monocularity/binocularity status. Fuller details of the results of this survey will be given in the poster.
Michael Oeverhaus - One of the best experts on this subject based on the ideXlab platform.
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First Evaluation of a Retinal Imaging Laser Eyewear System Based Low Vision Aid.
Clinical ophthalmology (Auckland N.Z.), 2020Co-Authors: Mareile Stöhr, Dirk Dekowski, Nikolaos E. Bechrakis, Joachim Esser, Anja Eckstein, Michael OeverhausAbstract:Purpose We conducted this trial to investigate a new wearable laser-eyewear (LEW). Images of an integrated camera are projected to the retina by a RGB-Laser (
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first evaluation of a retinal imaging laser eyewear system based Low Vision Aid
Clinical Ophthalmology, 2020Co-Authors: Mareile Stöhr, Dirk Dekowski, Nikolaos E. Bechrakis, Joachim Esser, Anja Eckstein, Michael OeverhausAbstract:Purpose We conducted this trial to investigate a new wearable laser-eyewear (LEW). Images of an integrated camera are projected to the retina by a RGB-Laser (<1µW) and MEMS-mirror system. This enables a full-color live video as augmented reality embedded in the field of Vision of the wearer. Thin parallel laser beams are projected folLowing the principle of Maxwellian view through the center of the ocular lens to ensure independency of refractive errors. We performed a study with healthy subjects to test this independency. Materials and Methods LEW was tested in 20 healthy subjects (aged between 21 and 60 years) with hyperopia, myopia, astigmatism and/or presbyopia. Subjects underwent standardized visual acuity (VA) measurements (ETDRS) without any correction, with LEW and with best correction. Results We found no significant correlation between refraction and VA while using LEW in linear regression (r=0.17). Still, younger participants performed better in terms of VA with the device compared to older participants despite no differences in BCVA (p<0.01). The achievable VA with LEW was in general reduced compared to uncorrected VA (0.50 vs 0.40 logMAR). Only myopic subjects reached a significantly higher VA using LEW (p<0.001). Presbyopic subjects showed enhanced near VA (0.25 logMAR) by reading at 15cm with LEW without any further necessary refractive correction. Nearly all patients (80%) showed stereopsis without need for additional adjustments. Conclusion Our investigation could verify the independence of LEW of refractive errors. Therefore, the technology seems to be especially useful in patients with untreatable corneal conditions, e.g., after corneal burns, to achieve higher VA since the thin laser should penetrate even corneal opacities with less scattering.
Michael D. Crossland - One of the best experts on this subject based on the ideXlab platform.
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Design considerations for the ideal Low Vision Aid: insights from de-brief interviews folLowing a real-world recording study.
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 2021Co-Authors: Eugenie Golubova, Michael D. Crossland, Sandra D. Starke, James S. WolffsohnAbstract:PURPOSE Low Vision Aids (LVAs) can have a transformative impact on people living with sight loss, yet the everyday requirements for developing such devices remain poorly understood and defined. This study systematically explored LVA requirements through a structured de-brief interview folLowing a real-world self-recording study. The purpose of this work was to define the actual needs of those living with sight loss so that Low Vision services can better address them in future. METHODS Thirty-two visually impaired volunteers with varying levels of previous LVA experience participated in a de-brief interview centred around a structured questionnaire. The de-brief folLowed a one-week real-world study during which participants used recoding spectacles to capture and narrate all situations in which they would use a 'perfect sight Aid'. Content and thematic analyses were used to analyse interviews which had the purpose of contextualising these recordings and exploring requirements around psychological, functional and design factors. RESULTS Participants reported that 46% of tasks which they had recorded were most important to them. Of these tasks, 82% were encountered frequently. Few tasks emerged as very important across many participants, the remaining tasks reflecting individual lifestyles or circumstances. Every participant used at least one LVA in their everyday life and 72% identified further coping strategies. Current LVAs identified as consistently poor were distance LVAs, with all other devices receiving mixed or only positive feedback. Around two-thirds of participants would prefer LVA use on an ad-hoc / quick access basis rather than over long periods of time, and just over half would prefer to carry it rather than wearing it all day. Lack of consistency in these responses illustrated potentially different user clusters with divergent design needs. Two-thirds of participants emphasised the desire for a discreet LVA that does not attract attention. However, since half of all participants felt self-conscious in public or in front of other people when wearing the small recording spectacles, this may not be technically achievable. CONCLUSIONS There is a substantial opportunity for new LVAs to address visual needs that traditional devices and coping strategies cannot support. Functional, psychological and design factors require careful consideration for future LVAs to be relevant and widely adopted.
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Benefit of an electronic head‐mounted Low Vision Aid
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 2019Co-Authors: Michael D. Crossland, Sandra D. Starke, Piotr Imielski, James S. Wolffsohn, Andrew R. WebsterAbstract:PURPOSE To evaluate the efficacy of electronic head-mounted Low Vision Aid (e-LVA) SightPlus (GiveVision, UK, giveVision.net) and to determine which people with Low Vision would see themselves likely using an e-LVA like this. METHODS Sixty participants with Low Vision aged 18 to 93 used SightPlus during an in-clinic study session based on a mixed methods design. Visual acuity (ETDRS), contrast sensitivity (Pelli-Robson) and reading performance (MNREAD) were measured binocularly at baseline (no device), with the device in 'normal' mode (zoom only), and with preferred enhanced mode (zoom and one of four digital image enhancements). At the end of the session, a short questionnaire recorded willingness to use an e-LVA like SightPlus, potential use cases, positive/negative comments and adverse effects. RESULTS Binocular distance visual acuity improved significantly by 0.63 logMAR on average (p
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benefit of an electronic head mounted Low Vision Aid
Ophthalmic and Physiological Optics, 2019Co-Authors: Michael D. Crossland, Sandra D. Starke, Piotr Imielski, James S. Wolffsohn, Andrew R. WebsterAbstract:PURPOSE To evaluate the efficacy of electronic head-mounted Low Vision Aid (e-LVA) SightPlus (GiveVision, UK, giveVision.net) and to determine which people with Low Vision would see themselves likely using an e-LVA like this. METHODS Sixty participants with Low Vision aged 18 to 93 used SightPlus during an in-clinic study session based on a mixed methods design. Visual acuity (ETDRS), contrast sensitivity (Pelli-Robson) and reading performance (MNREAD) were measured binocularly at baseline (no device), with the device in 'normal' mode (zoom only), and with preferred enhanced mode (zoom and one of four digital image enhancements). At the end of the session, a short questionnaire recorded willingness to use an e-LVA like SightPlus, potential use cases, positive/negative comments and adverse effects. RESULTS Binocular distance visual acuity improved significantly by 0.63 logMAR on average (p < 0.0001) to 0.20 logMAR. Contrast sensitivity improved significantly by 0.22 log units (p < 0.0001) to 1.21 log units with zoom only and by 0.40 log units to 1.37 log units with zoom and preferred image enhancement. Reading performance improved significantly for near visual acuity and critical print size (p < 0.015), although reading speed significantly decreased (p < 0.0001). Nearly half (47%) of the participants indicated they would use an e-LVA like SightPlus, especially for teleVision, reading and entertainment (e.g. theatre). Multivariate logistic regression showed that proportion of lifetime affected by sight loss, baseline contrast sensitivity and use of electronic LVAs explained 41% of the variation in willingness to use. CONCLUSIONS SightPlus improves visual function in people with Low Vision and would be used in its current form by one half of the people who tried it. Adverse effects were infrequent and resolved when the device was removed. Future work should focus on comparing e-LVAs through repeatable real-world tasks and impact on quality of life.
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Tablet computers versus optical Aids to support education and learning in children and young people with Low Vision: protocol for a pilot randomised controlled trial, CREATE (Children Reading with Electronic Assistance To Educate).
BMJ open, 2017Co-Authors: Michael D. Crossland, Rachel Thomas, Hilary Unwin, Seelam Bharani, Vijaya K. Gothwal, Ana Quartilho, Catey Bunce, Annegret Dahlmann-noorAbstract:Introduction Low Vision and blindness adversely affect education and independence of children and young people. New ‘assistive’ technologies such as tablet computers can display text in enlarged font, read text out to the user, alLow speech input and conversion into typed text, offer document and spreadsheet processing and give access to wide sources of information such as the internet. Research on these devices in Low Vision has been limited to case series. Methods and analysis We will carry out a pilot randomised controlled trial (RCT) to assess the feasibility of a full RCT of assistive technologies for children/young people with Low Vision. We will recruit 40 students age 10–18 years in India and the UK, whom we will randomise 1:1 into two parallel groups. The active intervention will be Apple iPads; the control arm will be the local standard Low-Vision Aid care. Primary outcomes will be acceptance/usage, accessibility of the device and trial feasibility measures (time to recruit children, lost to folLow-up). Exploratory outcomes will be validated measures of Vision-related quality of life for children/young people as well as validated measures of reading and educational outcomes. In addition, we will carry out semistructured interviews with the participants and their teachers. Ethics and dissemination NRES reference 15/NS/0068; dissemination is planned via healthcare and education sector conferences and publications, as well as via patient support organisations. Trial registration number NCT02798848; IRAS ID 179658, UCL reference 15/0570.
