Jin Ya-Ping, Huang Kiko Zi Yi, Zhao Qingqing K, Trope Graham E, Buys Yvonne M, El-Defrawy Sherif, Yan Peng, Brent Michael H, Butty Ziad
Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, ON, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada; Institute of Medical Science, University of Toronto, Toronto, ON, Canada.
Institute of Medical Science, University of Toronto, Toronto, ON, Canada.
Can J Ophthalmol. 2025 Jun;60(3):141-149. doi: 10.1016/j.jcjo.2024.08.016. Epub 2024 Sep 20.
To estimate the prevalence of glaucoma in Canada based on self-reports and test data, including Frequency Doubling Technology Perimetry (FDT), optic nerve vertical cup-to-disc ratio (CDR), intraocular pressure (IOP), and use of glaucoma medications.
Cross-sectional survey.
2,600-4,100 participants aged 40-79 in the Canadian Health Measures Survey 2016-2019 with available information from self-report, CDR, FDT, and IOP.
Glaucoma was defined by self-reports, CDR ≥ 0.7 only, or failed FDT only. Incorporating results of CDR, FDT, IOP, and use of glaucoma medications, participants were further classified as definite glaucoma (failed FDT and CDR ≥ 0.7) or glaucoma suspects (CDR ≥ 0.7 only, failed FDT only, or IOP > 21 mmHg only, or "normal" values of FDT, CDR, and IOP but used glaucoma medications). Survey weights were used in analyses.
The glaucoma prevalence was 2.5% (95% confidence interval [CI] 1.7%-3.3%) utilizing self-reports, 3.0% (95% CI 2.1%-3.9%) by CDR ≥ 0.7 only and 10.3% (7.8%-12.8%) with failed FDT only. Merging test data, the prevalence of definite glaucoma was 0.7% (95% CI 0.3%-1.1%) and the prevalence of suspected glaucoma was 16.3% (95% CI 13.2%-19.4%). Among the patients suspected of having glaucoma, 44.4% had ocular hypertension (OHT, mean IOP 22.8 mmHg) and 6.8% used glaucoma medications. IOP ≥28 mmHg was found in 2.4% of OHT individuals, and none used glaucoma medications.37.5% of Canadians with definite glaucoma were unaware they had glaucoma.
Glaucoma prevalence in Canadians aged 40-79 varied between 0.7% and 10.3% depending on definition used. 16.3% of Canadians were labeled "glaucoma suspects". Nearly 40% of Canadians with definite glaucoma were unaware of having glaucoma.
