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Developing consensus definitions and methods for non-visually impairing eye conditions for population-based eye
Ada Aghaji1, Onochie Okoye2,3, Nkiru Zuada Nwachukwu4
1Department of Ophthalmology, University of Nigeria Faculty of Clinical Sciences, Enugu, Nigeria aaghaji@yahoo.co.uk.
BMJ Open
|March 9, 2026
Summary
Consensus definitions for non-visually impairing eye conditions (NVICs) were established for population-based eye surveys. These standardized definitions will aid in assessing the prevalence and magnitude of NVICs for public health planning.
Area of Science:
- Ophthalmology
- Public Health
- Epidemiology
Background:
- Standardized definitions for non-visually impairing eye conditions (NVICs) are crucial for accurate population-based eye surveys.
- Existing assessments lack consistent methodologies, hindering comparability and planning.
Purpose of the Study:
- To establish consensus definitions and assessment methods for NVICs.
- To provide standardized criteria for use in population-based eye surveys in Nigeria.
Main Methods:
- A modified Delphi exercise involving Nigerian ophthalmologists.
- Literature review and expert panel questionnaire informed the Delphi process.
- Consensus was defined as agreement by at least 70% of respondents.
Main Results:
- Forty-two experienced ophthalmologists participated in the three-round Delphi exercise.
- High response rates were achieved across all rounds (92.9% to 100%).
- Consensus was reached on definitions and assessment methods for NVICs for population surveys.
Conclusions:
- Consensus case definitions for NVICs were developed using a modified Delphi approach.
- These standardized definitions will facilitate the assessment of NVIC prevalence and magnitude.
- Further research is recommended to validate these definitions for broader application.
