![]() Results: At the background brightness level 60, 85 and 100 cd/m2 there was statistically significant difference in all the spatial frequencies results, between all the groups (p<0.0001). Contrast vision measurements were performed under mesopic conditions at different background brightness levels: 60 cd/m2 85 cd/m2 100 cd/m2, and spatial frequencies:4 cpd 6 cpd 12 cpd 18 cpd. The objective scattering index (OSI) was measured with HD Analyzer (Version 2.7.0.0). The contrast sensitivity was measured with alternative forced choice test design (AFC) before and two weeks after Femto laser cataract surgery. Methods: Our research investigated 82 patients (73 eyes) with cataract and 56 (112 eyes) control group patients. Our aim was to estimate the contrast vision sensitivity at different background levels and compare light scattering in patients before and after cataract surgery. Contrast vision tests can be a useful method to determine if the surgery is needed and the tests help to understand patient complaints about daily life tasks like driving. Purpose: Neurosensory vision tests can be an additional test to define the progression of cataract. The results of this step of the PECI development process will inform subsequent phases for development of the WHO's package of evidence-based eye care interventions for cataract. Few guidelines met the quality criteria, and only three countries were represented. Differences in recommendations across guidelines may be attributable to time of publication or regional differences in surgical practice. Most 'strong' recommendations were supported by good quality evidence. The recommendations across the four guidelines covered pre-operative (43%), intra-operative (37%), and post-operative interventions (20%). We identified 3778 reports, 35 related to cataract guidelines, four of which met the inclusion criteria (United Kingdom: 2, United States: 1, Iran: 1). Quality appraisal was conducted using the Appraisal of Guidelines for Research and Evaluation (AGREE) II tool. Guidelines were excluded if there was commercial funding or unmanaged conflicts of interest. We searched academic and guideline databases, and websites of professional associations, for guidelines published between January 2010 and April 2020. This paper presents the results of a systematic review of clinical practice guidelines for cataract in adults, to help inform PECI development. The World Health Organization (WHO) is developing a Package of Eye Care Interventions (PECI) to facilitate the integration of eye care into Universal Health Coverage.
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