Biomedical subjects

Joanne Wood

Publications and source records attributed to Joanne Wood.

5 recordsLinked to original sources

PubMed2006

The effect of auditory and visual distracters on the useful field of view: implications for the driving task.

PURPOSE: The driving environment is becoming increasingly complex, including both visual and auditory distractions within the in-vehicle and external driving environments. This study was designed to investigate the effect of visual and auditory distractions on a performance measure that has been shown to be related to driving safety, the useful field of view. METHODS: A laboratory study recorded the useful field of view in 28 young visually normal adults (mean 22.6 +/- 2.2 years). The useful field of view was measured in the presence and absence of visual distracters (of the same angular subtense as the target) and with three levels of auditory distraction (none, listening only, listening and responding). RESULTS: Central errors increased significantly (P < 0.05) in the presence of auditory but not visual distracters, while peripheral errors increased in the presence of both visual and auditory distracters. Peripheral errors increased with eccentricity and were greatest in the inferior region in the presence of distracters. CONCLUSIONS: Visual and auditory distracters reduce the extent of the useful field of view, and these effects are exacerbated in inferior and peripheral locations. This result has significant ramifications for road safety in an increasingly complex in-vehicle and driving environment.

Adult↗

PubMed2005

Cognitive, sensory and physical factors enabling driving safety in older adults.

We reviewed literature on cognitive, sensory, motor and physical factors associated with safe driving and crash risk in older adults with the goal of developing a model of factors enabling safe driving behaviour. Thirteen empirical studies reporting associations between cognitive, sensory, motor and physical factors and either self-reported crashes, state crash records or on-road driving measures were identified. Measures of attention, reaction time, memory, executive function, mental status, visual function, and physical function variables were associated with driving outcome measures. Self-monitoring was also identified as a factor that may moderate observed effects by influencing driving behavior. We propose that three enabling factors (cognition, sensory function and physical function/medical conditions) predict driving ability, but that accurate self-monitoring of these enabling factors is required for safe driving behaviour.

Accidents, Traffic↗

PubMed2005

Distinguishing inflicted versus accidental abdominal injuries in young children.

OBJECTIVES: To compare the presentation of young children with abdominal trauma caused by high-velocity accidental (HVA), low-velocity accidental (LVA), and inflicted injury, and to test the hypothesis that a delay in care is highly predictive of an inflicted injury. METHODS: We performed a retrospective chart review at an urban Level I pediatric trauma center between 1991 and 2001 of children younger than 6 years who were admitted with abdominal injuries and an Abbreviated Injury Scale (AIS) score > or = 2. Charts were abstracted for demographic information, history of presentation, mechanism of injury, and diagnoses. Accidental injuries were defined as high velocity (motor vehicle crash or a fall from > 10 feet) or low velocity (household trauma, bicycle crash, or a fall from < 10 feet). Inflicted trauma was defined as a constellation of unexplained injuries, confessions by a perpetrator, or disclosure by the victim. RESULTS: Of the 121 children in the study, 77 (64%) had HVA injuries, 31 (26%) had LVA injuries, and 13 (11%) had inflicted injuries. Solid organ injuries (e.g., liver, spleen, and kidney) were most common in all groups, and abused children were significantly more likely to have suffered a hollow viscus injury (p = 0.03). Abused children were also significantly more likely to have suffered injuries with an AIS score >3 and combined hollow viscus and solid organ injuries than the HVA group or the LVA group (p < 0.001). Presentation for medical care occurred within 12 hours for 100% of the HVA group but only 65% of the LVA group, and 46% of the abuse group (p < 0.001). Presentation to care at greater than 12 hours was neither specific nor highly predictive of abuse, as some children with LVA injuries presented for care late despite developing symptoms shortly after their injury occurred (specificity, 65% [95% confidence interval, 45-81%]; positive predictive value, 39% [95% confidence interval, 17-64%]). CONCLUSION: Young children with inflicted abdominal injuries are more likely to have more severe injuries, multiple injuries, and a delay in seeking care than young children with accidental abdominal trauma. However, delay in seeking care is not specific for inflicted injury and occurs in some children with LVA abdominal trauma.

Abbreviated Injury Scale↗

PubMed2005

Amblyopia: prevalence, natural history, functional effects and treatment.

Amblyopia, defined as poor vision due to abnormal visual experience early in life, affects approximately three per cent of the population and carries a projected lifetime risk of visual loss of at least 1.2 per cent. The presence of amblyopia or its risk factors, mainly strabismus or refractive error, have been primary conditions targeted in childhood vision screenings. Continued support for such screenings requires evidence-based understanding of the prevalence and natural history of amblyopia and its predisposing conditions, and proof that treatment is effective in the long term with minimal negative impact on the patient and family. This review summarises recent research relevant to the clinical understanding of amblyopia, including prevalence data, risk factors, the functional impact of amblyopia and optimum treatment regimes and their justification from a vision and life skills perspective. Collectively, these studies indicate that treatment for amblyopia is effective in reducing the overall prevalence and severity of visual loss from amblyopia. Correction of refractive error alone has been shown to significantly reduce amblyopia and less frequent occlusion can be just as effective as more extensive occlusion. Occlusion or penalisation in amblyopia treatment can create negative changes in behaviour in children and impact on family life, and these factors should be considered in prescribing treatment, particularly because of their influence on compliance. Ongoing treatment trials are being undertaken to determine both the maximum age at which treatment of amblyopia can still be effective and the importance of near activities during occlusion. This review highlights the expansion of current knowledge regarding amblyopia and its treatment to help clinicians provide the best level of care for their amblyopic patients that current knowledge allows.

Adaptation, Psychological↗

PubMed2005

Vision and falls.

Falls occur in about one third of older people living independently in the community every year. This can lead to significant physical, psychological and financial costs to the individual and the community. While the risk factors for falls in older people are multifactorial, poor vision is considered to be an important contributing factor. The aim of this review is to evaluate current research linking impaired visual function with falls and to review current intervention strategies for the prevention of falls in older individuals. The evidence from the current literature indicates that impairment of visual functions, such as visual acuity, contrast sensitivity, visual fields and depth perception, is associated with an increased risk of falls. Recent studies have also demonstrated that falls can be reduced following cataract surgery as a visual intervention. Optometrists need to be aware of these associations and through appropriate treatment, referral and/or education, they can play a major role in optimising visual function in older people, as part of a multidisciplinary approach to falls prevention.

Accidental Falls↗