Trends in provision of photodynamic therapy and clinician attitudes: a tracker survey of a new health technology

BACKGROUND: There has been debate about the cost-effectiveness of photodynamic therapy (PDT), a treatment for neovascular age-related macular degeneration. We have been monitoring trends for the provision of PDT in the UK National Health Service. The fourth annual 'tracker' survey took place as definitive National Institute for Clinical Excellence (NICE) guidance was issued. We assessed trends in PDT provision up to the point of release of the NICE guidance and identified likely sources of pressure on ophthalmologists to provide PDT. METHODS: National postal questionnaire survey of clinicians with potential responsibility for PDT provision. The survey explored reported local provision, beliefs about the effectiveness of PDT and what sources of opinion might influence attitudes towards providing PDT. RESULTS: The response rate was 73% (111/150). Almost half of the surveyed ophthalmology units routinely provided PDT, as part of a trend of steady growth in provision. The proportion of respondents who believed that further proof of effectiveness was required has also declined despite the absence of any new substantial evidence. Attitudes towards providing PDT were positive, on average, and were more strongly associated with perceived social pressure from local colleagues than from other sources. Local colleagues were seen as being most approving of PDT. CONCLUSION: Those responsible for implementing the NICE guidance need to address ophthalmologists' beliefs about the evidence of effectiveness for PDT and draw upon supportive local individuals or networks to enhance the credibility of the guidance

Is the NEI-VFQ-25 a useful tool in identifying visual impairment in an elderly population?

BACKGROUND: The use of self-report questionnaires to substitute for visual acuity measurement has been limited. We examined the association between visual impairment and self reported visual function in a population sample of older people in the UK. METHODS: Cross sectional study of people aged more than 75 years who initially participated in a trial of health screening. The association between 25-item National Eye Institute Visual Function Questionnaire (NEI-VFQ) scores and visual impairment (defined as an acuity of less than 6/18 in the better eye) was examined using logistic regression. RESULTS: Visual acuity and NEI-VFQ scores were obtained from 1807 participants (aged 77 to 101 years, 36% male), from 20 general practices throughout the UK. After adjustment for age, gender, practice and NEI-VFQ sub-scale scores, those complaining of poor vision in general were 4.77 times (95% CI 3.03 to 7.53) more likely to be visually impaired compared to those who did not report difficulty. Self-reported limitations with social functioning and dependency on others due to poor vision were also associated with visual impairment (odds ratios, 2.52, 95% CI 1.55 to 4.11; 1.73, 95% CI 1.05 to 2.86 respectively). Those reporting difficulties with near vision and colour vision were more likely to be visually impaired (odds ratios, 2.32, 95% CI 1.30 to 4.15; 2.25, 95% CI 1.35 to 3.73 respectively). Other NEI-VFQ sub-scale scores were unrelated to measures of acuity. Similar but weaker odds ratios were found with reduced visual acuity (defined as less than 6/12 in the better eye). Although differences in NEI-VFQ scores were small, scores were strongly associated with visual acuity, binocular status, and difference in acuity between eyes. CONCLUSION: NEI-VFQ questions regarding the quality of general vision, social functioning, visual dependency, near vision and colour vision are strongly and independently associated with an objective measure of visual impairment in an elderly population

Depression and anxiety in visually impaired older people.

PURPOSE: To investigate the association between visual impairment and depression and anxiety in older people in Britain. DESIGN: Population-based cross-sectional study. PARTICIPANTS: Thirteen thousand nine hundred people aged 75 years and older in 49 family practices in Britain. METHODS: Vision was measured in 13 900 people aged 75 years and older in 49 family practices taking part in a randomized trial of health screening that included depression (Geriatric Depression Scale [GDS-15]) and anxiety (General Health Questionnaire [GHQ-28]). Cause of visual impairment (binocular acuity less than 6/18) was assessed from medical records. Analysis was by logistic regression (odds ratio [OR] and 95% confidence interval [CI]), taking account of potential health and social confounders. MAIN OUTCOME MEASURES: Levels of depression and anxiety. RESULTS: Visually impaired people had a higher prevalence of depression compared with people with good vision. Of visually impaired older people, 13.5% were depressed (GDS-15 score of 6 or more) compared with 4.6% of people with good vision (age- and gender-adjusted OR, 2.69; 95% CI, 2.03-3.56). Controlling for potential confounding factors, particularly activities of daily living, markedly attenuated the association between visual impairment and depression (OR, 1.26; 95% CI, 0.94-1.70). There was little evidence for any association between visual impairment and anxiety. On the GHQ-28 scale, 9.3% of visually impaired people had 2 or more symptoms of anxiety compared with 7.4% of people with good vision. CONCLUSIONS: Although cause and effect cannot be established in a cross-sectional study, it is plausible that people with visual impairment are more likely to experience problems with functioning, which in turn leads to depression

Age-related macular degeneration causing visual impairment in people 75 years or older in Britain: an add-on study to the Medical Research Council Trial of Assessment and Management of Older People in the Community.

PURPOSE: Age-related macular degeneration (AMD) is the most commonly occurring cause of visual loss in people registered as blind or partially sighted. There are no nationally representative data on the prevalence of AMD in the British population. We aimed to estimate the prevalence of AMD causing visual impairment in people 75 years or older in Britain. DESIGN: Population-based cross-sectional study. PARTICIPANTS: Thirteen thousand nine hundred people 75 years or older in 49 practices taking part in the Medical Research Council Trial of the Assessment and Management of Older People in the Community. METHODS: Trial nurses tested visual acuity in everyone 75 years or older in participating practices. We collected data on the cause of visual loss for everyone who was visually impaired. We obtained these data from review of the general practice medical notes and by sending a questionnaire to the hospital ophthalmologist. Visual impairment was defined as a binocular acuity of less than 6/18. MAIN OUTCOME MEASURE: Prevalence of AMD causing visual impairment. RESULTS: There were 976 visually impaired people for whom a cause of visual loss was established. Of these, 516 (53%) had AMD as a cause of visual loss. We estimate that 3.7% (95% confidence interval, 3.2%-4.2%) of the population 75 years or older and 14.4% (11.6%-17.2%) of the population 90 years or older are visually impaired due to AMD. There are an estimated 192 000 people 75 years or older visually impaired due to AMD in the United Kingdom (95% confidence interval, 144 000-239 000). CONCLUSION: Our results, from the largest and most representative study of the causes of vision loss in older people in the British population, confirm the substantial burden of AMD in people 75 years and older. As the population ages, this problem will get worse. The needs of this group for vision aids and other support in the community should be addressed; research on the causes of AMD and possible preventive measures should be given priority

Cause-specific visual impairment and mortality: results from a population-based study of older people in the United Kingdom.

OBJECTIVE: To assess the association between mortality and cause-specific visual impairment in older people. METHODS: Visual acuity and causes of visual impairment were collected in 13 569 participants 75 years and older participating in a randomized trial of health screening. Participants were followed up for mortality for a median of 6.1 years. RESULTS: Compared with those with 6/6 (or 20/20 Snellen) or better visual acuity, the age- and sex-adjusted rate ratio for visually impaired people (binocular visual acuity <6/18 or <20/60 Snellen) was 1.60 (95% confidence interval, 1.47-1.74), which was markedly attenuated (rate ratio, 1.17; 95% confidence interval, 1.07-1.27) after adjustment for confounding factors. People whose visual impairment was due to cataract or age-related macular degeneration had excess risks of all-cause and cardiovascular mortality, which disappeared after adjustment. People with refractive error remained at small risk, despite adjustment, probably owing to residual confounding from factors associated with minimal use of eye services rather than underlying eye disease. There were no associations with cancer mortality. CONCLUSION: Associations reported for visual impairment and mortality or for specific causes of visual impairment reflect confounding by comorbidities, risk factors, and other factors related to susceptibility to death rather than an independent biological association of vision problems or specific eye diseases