Calculation of CSR and CSC and visual acuity thresholds

Calculation of CSR and CSC and visual acuity thresholds

IAPB 9GA Hyderabad 2012 Calculation of CSR and CSC and visual acuity thresholds G V S Murthy Improving health worldwide www.iceh.org.uk www.lshtm.ac.uk

Institutional Affiliation Reader, International Centre for Eye Health, Department of Clinical Research, Faculty of Infectious and Tropical Diseases , London School of Hygiene and Tropical Medicine &

Director, Indian Institute of Public Health, Public Health Foundation of India, Hyderabad Improving health worldwide www.iceh.org.uk www.lshtm.ac.uk Acknowledgements

Dr Hans Limburg Dr B R Shamanna Their inputs were critical to this presentation Characteristics Cataract Surgical Rate (CSR) uses the population as the denominator

Cataract Surgical Coverage (CSC) uses operated persons in the community as the denominator. Both can be used in conjunction to compare performance and pending workload at regional/ national level. Cataract Surgical Rate (CSR) Number of cataract operations (eyes) conducted per million population per year

Indicator for output on cataract intervention Denominator is total population while cataract occurs mainly in people 50+ Who is operated? (age, sex, 1st or 2nd eye, VA?) Depends on accuracy of data collection Risk of over- or under-reporting What data is needed to calculate CSR?

Population of administrative area Quantum of cataract surgeries (operated eyes) Time period when above events occur i.e. specific year Usually obtained from secondary data sources. Cataract Surgical Rate No. of Cataract Surgeries/ Year x 106

Population in Defined Area Cataract Surgeries refers to Operated Eyes Cataract Surgical Coverage (CSC) Objective: coverage indicator measures accessibility & utilization of services measures actual community level situation independent of reporting system

Assumption: - VA at time of surgery not known: use VA threshold conforming to surgical practice in survey area Cataract Surgical coverage Sources of Data: Surveys RACSS/RAAB

What data is needed to calculate CSC? No. of cataract blind/visually impaired Quantum of cataract surgeries (eyes/persons) Time period when above events occur i.e. specific year Valid data generally possible only from primary sources in LMIC . i.e. RAAB

Defining CSC Can be calculated at person level or operated eye level Can be calculated at different visual acuity levels (based on a countrys needs/ surgical practices) VA<3/60: cataract blind eye or person VA<6/60: severely visually impaired cataract eye or person VA<6/18: visually impaired cataract eye or person

Calculating CSC CSC eyes: (a/a+b) x 100 Where: a = no. (pseudo)aphakic eyes b = no. eyes with operable cataract (BCVA<3/60; <6/60; <6/18) CSC persons: (x + y/x + y + z) x 100 Where: x = persons with bilateral (pseudo)aphakia y = persons with 1 (pseudo)aphakic and 1 operable cataract z = persons with bilateral operable cataract (BCVA<3/60; <6/60; <6/18) THANK YOU

Recently Viewed Presentations

  • Perspective on Parallel Programming - Ryerson University

    Perspective on Parallel Programming - Ryerson University

    Optimizing program: temporal and spatial locality Extended Hierarchy Idealized view: local cache hierarchy + single main memory But reality is more complex Centralized Memory: caches of other processors Distributed Memory: some local, some remote; + network topology Management of levels...
  • www.fdiworlddental.org

    www.fdiworlddental.org

    Radiation Protection in Dental Radiology L04 General Principles of Film and Digital Radiography. Effects of Pixel size and Bit-depth. For an image of a M x N matrix, k bytes/pixel, the memory needed to store the image is . k...
  • Unit 3 Grade 9

    Unit 3 Grade 9

    Synonym: conceited . Margaret believed that she would have no trouble getting elected, as she thinks that she is the only viable candidate; however, her classmates have no patience for her egocentric attitude and elected Stanley instead.
  • Intro to Ancient Greece - Loudoun County Public Schools

    Intro to Ancient Greece - Loudoun County Public Schools

    Geography. The sea shaped Greek civilization just as rivers shaped the ancient civilizations. Greeks rarely had to travel more than 85 miles to reach the coastline. The Aegean Sea, the Ionian Sea, and the neighboring Black Sea were important transportation...
  • Redundante Servervirtualisierung

    Redundante Servervirtualisierung

    Herausforderung. Energie- und Kosteneffizienz. durch . Virtualisierung. bei hoher Verfügbarkeit. und Datensicherheit. Neue Anforderungen werden mit neuen Lösungen begegnet, die einzeln genommen kostengünstig und bestmöglich sind, aber Gesamtkosten hoch
  • Thème 3 - Les cellules

    Thème 3 - Les cellules

    Le transport des grosses particules (p. 35 à 38) 33. Quel type de particules ne peut traverser la membrane par aucun moyen? Les molécules trop GROSSES ou trop POLAIRES 34. Que fait la cellule lorsqu'elle doit absorber ou expulser ces...
  • Finding Your Healthy Work/Life Balance By: Lorinda Lewis

    Finding Your Healthy Work/Life Balance By: Lorinda Lewis

    94% professionals work more than 50 hours a week. More than half of that 94% work more than 65 hours a week. Psychological and physical problems cost $125 to $190 billion a year in healthcare. 47% of American employees did...
  • Coherent Synchrotron Radiation in Bends

    Coherent Synchrotron Radiation in Bends

    Sommerfeld (1920's) replaced the distribution by the Fermi-Dirac distribution. Drude-Sommerfeld free-electron model correctly describes many electrical and thermal properties of metals through the infrared Free electron model of conductivity (see e.g. Ashcroft and .