Dataset Information

The theory of critical flicker fusion frequency and its application in cataracts.

ABSTRACT:

Background

Due to media opacity, it is usually difficult to accurately evaluate the postoperative visual acuity in cataracts patients. As a small and portable tool, the critical flicker fusion frequency (CFF) device reflects the temporal resolution of visual function and has been widely used in clinical research. However, poor understanding of the technique and equipment limitations have restricted its clinical application in China.

Main text

There was a decrease in the CFF value in various ophthalmic diseases, indicating that the CFF is sensitive to detect visual functional changes. A number of studies have shown that the CFF test can accurately distinguish patients with simple cataracts from those with cataracts combined with fundus disease, and, as a visual test, it can more accurately predict postoperative visual acuity without being affected by media opacity. This study comprehensive reviews the basic principles of CFF and its application in ophthalmology, especially in cataracts.

Conclusions

As one of the tools for dynamic visual function detection, the CFF test could help doctors to assess the possible presence of fundus disease in cataracts patients, especially in eyes with dense cataracts, and more precisely provide a reasonable visual prognosis than other available visual tests.

SUBMITTER: Xu G

PROVIDER: S-EPMC10577820 | biostudies-literature | 2023 Feb-Mar

REPOSITORIES: biostudies-literature

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Publications

The theory of critical flicker fusion frequency and its application in cataracts.

Xu Guangcan G Fu Junxia J Qi Haolan H Li Linyu L Chen Wenqian W Gao Yi Y Ma Tianju T Ye Zi Z Li Zhaohui Z

Advances in ophthalmology practice and research 20221022 1

<h4>Background</h4>Due to media opacity, it is usually difficult to accurately evaluate the postoperative visual acuity in cataracts patients. As a small and portable tool, the critical flicker fusion frequency (CFF) device reflects the temporal resolution of visual function and has been widely used in clinical research. However, poor understanding of the technique and equipment limitations have restricted its clinical application in China.<h4>Main text</h4>There was a decrease in the CFF value ...[more]

PMID: 37846427

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Project description:BackgroundThe reaction time (RT) is "the time taken for the appearance of rapid voluntary reaction by an individual following a stimulus, either auditory or visual" and the Critical Flickering Fusion Frequency (CFFF) is "the rate at which successively presented light stimuli appear to be steady and continuous". RT and CFFF are commonly used for the assessment of cognitive functions that are known to influence academic performance. However, data about the exact correlation between these are scarce, particularly in India. This research aimed to study the association between visual RT (VRT), auditory RT (ART) and CFFF and their impact on the academic performance of undergraduate students.MethodsThis cross-sectional study was conducted on 700 students of Faculty of Medicine and Dentistry at a private medical university in South India, during the period from 2015 to 2017. The VRT, ART and CFFF were evaluated, and the best out of three subsequent attempts was recorded. The mean score (in percentage) of the three best marks out of the five internal assessments for the course during each academic year was considered for analysis. The association between the different cognitive tests and the average academic performance was analysed.ResultsFemale students had faster VRT (n = 345, mean = 243.97, SD = 83.87) than male students (n = 273, mean = 274.86, SD = 96.97) (p = 0.001). VRT and ART had a moderate negative correlation with academic performance (for ART, r = - 0.42, p < 0.001; for VRT; r = - 0.40, p < 0.001). CFFF had a very weak positive correlation with academic performance (r = 0.19, p = 0.01). The only independent predictors of academic performance were RT and gender (Adjusted R2 = 0.11).ConclusionAlthough there is a correlation between CFFF and cognitive function, our study showed only a weak correlation between CFFF and academic performance. Female students had faster RTs, and gender was an independent predictor of academic performance. Rather, students with faster RTs appear to have an advantage in academic performance.

Project description:BackgroundAs realist methodology is still evolving, there is a paucity of guidance on how to conduct theory driven interviews. Realist researchers can therefore struggle to collect interview data that can make a meaningful contribution to refining their initial programme theory. Collecting data to inform realist Inital Programme Theories (IPTs) in healthcare contexts is further compounded due to the healthcare workers' busy work schedules. In this case study of team interventions in acute hospital contexts, we explore the benefits of using the Critical Incident Technique (CIT) in order to build and refine an initial programme theory. We contend that use of the CIT helps to draw on more specific experiences of "Key Informants" and therefore elicits richer and more relevant data for realist enquiry.MethodsThe five steps of the CIT were mapped against realist methods guidance and adapted into an interview framework. Specifications to identify an incident as "critical" were agreed. Probes were embedded in the interview framework to confirm, refine and/or refute previous theories. Seventeen participants were interviewed and recordings were transcribed and imported for analysis into NVivo software. Using RAMESES guidelines, Context-Mechanism-Outcomes configurations were extrapolated from a total of 31 incidents.ResultsWe found that the CIT facilitated construction of an interview format that allowed participants to reflect on specific experiences of interest. We demonstrate how the CIT strengthened initial programme theory development as it facilitated the reporting of the specifics of team interventions and the contexts and mechanisms characteristic of those experiences. As new data emerged, it was possible to evolve previous theories synthesised from the literature as well as to explore new theories.ConclusionsUtilising a CIT framework paid dividends in terms of the relevance and usefulness of the data for refining the initial programme theory. Adapting the CIT questioning technique helped to focus the participants on the specifics relating to an incident allowing the interviewers to concentrate on probes to explore theories during the interview process. The CIT interview format therefore achieved its purpose and can be adapted for use within realist methodology.

Dataset Information

The theory of critical flicker fusion frequency and its application in cataracts.

Background

Main text

Conclusions

Publications

The theory of critical flicker fusion frequency and its application in cataracts.

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