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Blog Archive
Global Estimates of Blindness and Visual Impairments
Data from various global estiamates are summarized here for easy reference: Link to my personal google sheet: https://docs.google.com/spreadsheets/d/1iTgBmRA4VwWE1fzRKA1YD1fzzMvn90Vu/edit?usp=sharing&ouid=113111648583609130450&rtpof=true&sd=true Pascolini, 2010 NUMBERS (millions)WorldIndiaPopulation6737.901181.40Visual Impairment ( PVA < 6\18)285.3962.62Blindness (PVA < 3\60)39.378.08Low Vision (< 6\18-3\60)246.0254.54PREVALENCE (1000 per million population)WorldIndiaVisual Impairment ( PVA < 6\18)42.3653.00Blindness (PVA < 3\60)5.846.84Low Vision (< 6\18-3\60)36.5146.17 20102010GLOBALGLOBALBlindness PVA
May 29, 2024
Visual Acuity Conversion Chart
In order to simplify my life when dealing with variations in Visual Acuity Charts when dealing with data from different surveys, I have created the following table for VA conversions What about PL+ / PL-, FCCF etc LogMAR for 1/60 vision is 1.78, rounded off to 1.8 as used in
April 22, 2024
ICD 11 Vision Categories
When analyzing data from blindness surveys, one needs to map out visual acuity against the Visual impairment categorized in ICD. There are some nuances, especially w.r.t Moderate visual impairment (MVI) based on the charts used as some VA charts yield 6/18 vision while others yield 6/19. ICD11 Categories Based on
April 22, 2024
Stata Code for generating corneal opacity outcomes from RAAB 6 surveys
Corneal Opacity Related Outcomes There are four sets of variables Stata Code The above Stata code can be used by anyone under a CC-BY-SA license.
January 12, 2024
RAAB6 Surveys Stata Commands for Cataract Surgical Outcomes
The WHO Eye Care Indicator Menu has prescribed many core indicators. The Core Indicator 6 is Cataract surgical outcome (visual acuity) in the domain of Output – Eye Care Service Quality Definition: Percentage of eyes with: Estimation of these indicators can be accomplished using the below Stata code I have
August 6, 2023
Stata Code for eCSC and CSC calculations
WHO has identified WHO Effective Cataract Surgical Coverage (eCSC) as a key indicator for monitring Universal Eye Health. LINK There is a slight change from the prior formulae used for eCSC in papers by Ramke et al and the one published by Keel et al. Further, the original CSC estimation
March 14, 2023