Assessing visual activities of daily living in the visually impaired

Latham, Keziah; Usherwood, Claire

doi:10.1111/j.1475-1313.2009.00693.x

Cited by 19 publications

(20 citation statements)

References 40 publications

(62 reference statements)

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“…There was no comparison with normative data. Moreover the data for activities of daily living in these studies are based on subjective self reports and recent studies show that subjective self reports are not always a good predictor of actual difficulties when measured objectively 24 …”

Section: Discussionmentioning

confidence: 99%

How does the presence and duration of central visual impairment affect reaching and grasping movements?

Pardhan

Gonzalez-Alvarez

Subramanian

2011

Ophthalmic Physiologic Optic

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Subjects with CVI required extra time prior to starting the movement (as shown by longer onset time) and this was probably needed to localise the object and to perceive its dimensions. They spent more time after maximum grip aperture, indicating a need for a longer time to grasp the object. A possible reason is that visually impaired patients need to use more tactile information than normal subjects in order to fully execute grasping of the object. CVI that was of <10 years in duration affected more indices compared to CVI that was of long standing and may suggest adaptation to the visual impairment for this task.

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Section: Discussionmentioning

confidence: 99%

How does the presence and duration of central visual impairment affect reaching and grasping movements?

Pardhan

Gonzalez-Alvarez

Subramanian

2011

Ophthalmic Physiologic Optic

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“…Reading medicine labels is a challenging visual task that is important to be able to do accurately 1,2 . Its importance has been recognised in vision research by authors assessing functional vision 3–7 and by its inclusion in vision‐related quality of life questionnaires 8–10 …”

Section: Introductionmentioning

confidence: 99%

“…In a recent study, 5 it was noted that pharmacy labels constructed to guidelines used in previous research 4 were considered by subjects to be very much easier to read than their own medication labels. It is known that text legibility is dependent on many factors including size, 11,12 font, 13 and contrast, 14 but although details of what should be printed on a dispensed medicinal product are specified in UK law, 15 the legislation is silent with regard to the font or text size to be used on dispensing labels (personal communication: V Ramgoolam, Royal Pharmaceutical Society of Great Britain).…”

Section: Introductionmentioning

confidence: 99%

Do best practice guidelines improve the legibility of pharmacy labels for the visually impaired?

Latham

Waller

Schaitel

2011

Ophthalmic Physiologic Optic

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DfPS best practice guidelines were not fully met by any of the pharmacy labels in this sample. With unimpaired vision, label design had little impact on legibility. However, the results provide evidence that preparing pharmacy labels according to DfPS guidelines improves their relative legibility in simulated visual impairment. These findings need extending to those with actual visual impairment, but the current results strengthen the argument for conformance to DfPS guidelines.

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“…While self-report is an important element of a comprehensive assessment, the demonstration of skills in the presence of an experienced observer is necessary to affirm or challenge the information gathered during the self-report. 19 This provides the evaluator the opportunity to observe the subject performing common ADLs and orientation and mobility, while using the Argus II System and without using it (that is, using only the subject's residual vision). To choose the tasks, the team identified activities that both required vision for all or some portion of the task and had the potential to be improved with the range of vision provided by the System.…”

Section: Observation Of Performancementioning

confidence: 99%

FLORA™: Phase I development of a functional vision assessment for prosthetic vision users

Geruschat

Flax

Tanna³

et al. 2015

Clinical and Experimental Optometry

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Background Research groups and funding agencies need a functional assessment suitable for an ultra-low vision population in order to evaluate the impact of new vision restoration treatments. The purpose of this study was to develop a pilot assessment to capture the functional vision ability and well-being of subjects whose vision has been partially restored with the Argus II Retinal Prosthesis System. Methods The Functional Low-Vision Observer Rated Assessment (FLORA) pilot assessment involved a self-report section, a list of functional vision tasks for observation of performance, and a case narrative summary. Results were analyzed to determine whether the interview questions and functional vision tasks were appropriate for this ultra-low vision population and whether the ratings suffered from floor or ceiling effects. Thirty subjects with severe to profound retinitis pigmentosa (bare light perception or worse in both eyes) were enrolled in a clinical trial and implanted with the Argus II System. From this population, twenty-six subjects were assessed with the FLORA. Seven different evaluators administered the assessment. Results All 14 interview questions were asked. All 35 functional vision tasks were selected for evaluation at least once, with an average of 20 subjects being evaluated for each test item. All four rating options -- impossible (33%), difficult (23%), moderate (24%) and easy (19%) -- were used by the evaluators. Evaluators also judged the amount of vision they observed the subjects using to complete the various tasks, with vision only occurring 75% on average with the System ON, and 29% with the System OFF. Conclusion The first version of the FLORA was found to contain useful elements for evaluation and to avoid floor and ceiling effects. The next phase of development will be to refine the assessment and to establish reliability and validity to increase its value as a functional vision and well-being assessment tool.

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Assessing visual activities of daily living in the visually impaired

Cited by 19 publications

References 40 publications

How does the presence and duration of central visual impairment affect reaching and grasping movements?

How does the presence and duration of central visual impairment affect reaching and grasping movements?

Do best practice guidelines improve the legibility of pharmacy labels for the visually impaired?

FLORA™: Phase I development of a functional vision assessment for prosthetic vision users

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