Baseline risk factors for incidence of blindness in a South Indian population: the chennai eye disease incidence study.

Purpose: To report the baseline risk factors and causes for incident blindness.

Methods: Six years after the baseline study, 4419 subjects from the cohort underwent a detailed examination at the base hospital. Incident blindness was defined by World Health Organization criteria as visual acuity of less than 6/120 (3/60) and/or a visual field of less than 10° in the better-seeing eye at the 6-year follow-up, provided that the eye had a visual acuity of better than or equal to 6/120 (3/60) and visual field greater than 10° at baseline.

Predictors for incidence of primary open-angle glaucoma in a South Indian population: the Chennai eye disease incidence study.

Objective: To determine the 6-year incidence of primary open-angle glaucoma (POAG) and its associated predictors.

Design: Population-based cohort study.

Participants: A total of 4316 subjects without POAG at baseline who were 40 years of age and older from a south Indian population.

Six-year incidence of angle-closure disease in a South Indian population: the Chennai Eye Disease Incidence Study.

Purpose: To estimate the 6-year incidence of primary angle-closure (PAC) disease among adult population aged 40 years and older from rural and urban south India.

Design: Population-based longitudinal study.

Methods: A complete ophthalmologic examination, including applanation tonometry, gonioscopy, biometry, stereoscopic fundus examination, and automated perimetry was performed at both baseline and at the 6-year follow up at base hospital.

Prevalence and causes of low vision and blindness in an urban population: The Chennai Glaucoma Study.

Aim: To evaluate the prevalence and causes of low vision and blindness in an urban south Indian population.

Settings And Design: Population-based cross-sectional study. Exactly 3850 subjects aged 40 years and above from Chennai city were examined at a dedicated facility in the base hospital.

Importance of population-based studies in clinical practice.

In the last decade, there have been reports on the prevalence of glaucoma from the Vellore Eye Survey, Andhra Pradesh Eye Diseases Survey, Aravind Comprehensive Eye Survey, Chennai Glaucoma Study and West Bengal Glaucoma Study. Population-based studies provide important information regarding the prevalence and risk factors for glaucoma. They also highlight regional differences in the prevalence of various types of glaucoma.

Comparison of Humphrey MATRIX and Swedish interactive threshold algorithm standard strategy in detecting early glaucomatous visual field loss.

Purpose: The aim of this study was to compare the Humphrey MATRIX visual field (frequency doubling technology threshold) and Swedish interactive threshold algorithm (SITA) standard strategy white on white perimetry in detecting glaucomatous visual field loss.

Material And Methods: Twenty-eight adult subjects, diagnosed to have glaucoma at a tertiary eye care hospital, who fulfilled the inclusion criteria, were included in this prospective study. All subjects underwent a complete ophthalmic examination.

Comparison of refractive errors and factors associated with spectacle use in a rural and urban South Indian population.

Purpose: To compare the prevalence of refractive errors and factors associated with spectacle use in a rural and urban south Indian population.

Materials And Methods: Four thousand eight hundred subjects (age> 39 years) each from rural and urban Tamil Nadu were enumerated for a population-based study. All participants underwent a complete ophthalmic evaluation including best-corrected visual acuity (BCVA), objective and subjective refraction.

Population norms for frequency doubling perimetry with uncorrected refractive error.

Purpose: To compare the effect of uncorrected refractive error on threshold estimation using frequency doubling perimetry (FDP) full-threshold N-30 with emmetropia among normal subjects.

Methods: One thousand two hundred ninety-nine subjects were enrolled from the Chennai Glaucoma Study, a population-based glaucoma prevalence study. Subjects underwent a comprehensive eye examination including the FDP full-threshold N-30 test.