Flitcroft, DI;
He, M;
Jonas, JB;
Jong, M;
Naidoo, K;
Ohno-Matsui, K;
Rahi, J;
... Yannuzzi, L; + view all
(2019)
IMI - Defining and Classifying Myopia: A Proposed Set of Standards for Clinical and Epidemiologic Studies.
Investigative Ophthalmology and Visual Science
, 60
(3)
M20-M30.
10.1167/iovs.18-25957.
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Abstract
PURPOSE. We provide a standardized set of terminology, definitions, and thresholds of myopia and its main ocular complications. METHODS. Critical review of current terminology and choice of myopia thresholds was done to ensure that the proposed standards are appropriate for clinical research purposes, relevant to the underlying biology of myopia, acceptable to researchers in the field, and useful for developing health policy. RESULTS. We recommend that the many descriptive terms of myopia be consolidated into the following descriptive categories: myopia, secondary myopia, axial myopia, and refractive myopia. To provide a framework for research into myopia prevention, the condition of ‘‘premyopia’’ is defined. As a quantitative trait, we recommend that myopia be divided into myopia (i.e., all myopia), low myopia, and high myopia. The current consensus threshold value for myopia is a spherical equivalent refractive error 0.50 diopters (D), but this carries significant risks of classification bias. The current consensus threshold value for high myopia is a spherical equivalent refractive error 6.00 D. ‘‘Pathologic myopia’’ is proposed as the categorical term for the adverse, structural complications of myopia. A clinical classification is proposed to encompass the scope of such structural complications. CONCLUSIONS. Standardized definitions and consistent choice of thresholds are essential elements of evidence-based medicine. It is hoped that these proposals, or derivations from them, will facilitate rigorous, evidence-based approaches to the study and management of myopia.
| Type: | Article |
|---|---|
| Title: | IMI - Defining and Classifying Myopia: A Proposed Set of Standards for Clinical and Epidemiologic Studies |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1167/iovs.18-25957 |
| Publisher version: | https://doi.org/10.1167/iovs.18-25957 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. https://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Keywords: | myopia, myopia classification, myopia definitions, high myopia, myopia thresholds, high myopia, pathologic myopia |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health > Population, Policy and Practice Dept |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10072387 |
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