Intraocular Pressure Control Predicts Retinal Nerve Fiber Layer Thinning in Primary Angle Closure Disease: The CUPAL Study

Carol Y Cheung; Sophia Ling Li; Noel Chan; Poemen P Chan; Yumeng Wang; Mandy Wong; Isabel Lai; Clement C Tham

doi:10.1016/j.ajo.2021.08.004

Intraocular Pressure Control Predicts Retinal Nerve Fiber Layer Thinning in Primary Angle Closure Disease: The CUPAL Study

Am J Ophthalmol. 2022 Feb:234:205-214. doi: 10.1016/j.ajo.2021.08.004. Epub 2021 Aug 18.

Authors

Carol Y Cheung¹, Sophia Ling Li², Noel Chan², Poemen P Chan³, Yumeng Wang⁴, Mandy Wong³, Isabel Lai³, Clement C Tham⁵

Affiliations

¹ Department of Ophthalmology and Visual Sciences (C.Y.C., S.L.L., N.C., P.P.C., Y.W., M.W., I.L., C.C.T.), The Chinese University of Hong Kong. Electronic address: clemtham@cuhk.edu.hk.
² Department of Ophthalmology and Visual Sciences (C.Y.C., S.L.L., N.C., P.P.C., Y.W., M.W., I.L., C.C.T.), The Chinese University of Hong Kong; Department of Ophthalmology and Visual Sciences (S.L.L., N.C., C.T.), The Prince of Wales Hospital.
³ Department of Ophthalmology and Visual Sciences (C.Y.C., S.L.L., N.C., P.P.C., Y.W., M.W., I.L., C.C.T.), The Chinese University of Hong Kong; Hong Kong Eye Hospital (P.P.C., M.W., I.L., C.C.T.), Hong Kong, China.
⁴ Department of Ophthalmology and Visual Sciences (C.Y.C., S.L.L., N.C., P.P.C., Y.W., M.W., I.L., C.C.T.), The Chinese University of Hong Kong.
⁵ Department of Ophthalmology and Visual Sciences (C.Y.C., S.L.L., N.C., P.P.C., Y.W., M.W., I.L., C.C.T.), The Chinese University of Hong Kong; Department of Ophthalmology and Visual Sciences (S.L.L., N.C., C.T.), The Prince of Wales Hospital; Hong Kong Eye Hospital (P.P.C., M.W., I.L., C.C.T.), Hong Kong, China. Electronic address: clemtham@cuhk.edu.hk.

PMID: 34416183
DOI: 10.1016/j.ajo.2021.08.004

Abstract

Purpose: To determine the relationship of intraocular pressure (IOP) control with subsequent retinal nerve fiber layer (RNFL) thinning in patients with primary angle closure disease (PACD).

Design: Prospective cohort study.

Methods: The study monitored 517 treated PACD eyes from 280 Chinese patients at least 24 months. IOP was measured every 3 months using Goldmann applanation tonometry, and RNFLs were measured by spectral-domain optical coherence tomography (Spectralis, Heidelberg Engineering) every 6 months. IOP mean and fluctuation were calculated as the average and the coefficient of variation of IOP measurements during the first 18 months of the study period. The relationship between IOP and subsequent RNFL changes over time were examined using multivariable linear mixed models. Intraclass correlations at the patient and eye levels were also controlled using nested random intercepts in the models.

Results: IOP mean (β = -1.20 µm/y per 1 mm Hg, P < .001) and IOP fluctuation (β = -3.10 µm/y per 10% unit change in the coefficient of variation, P < .001) were independently negatively associated with subsequent progressive global RNFL changes, after adjustment for age, sex, and baseline RNFL thickness. In the sectoral analysis, both higher mean IOP and IOP fluctuation predicted progressive RNFL thinning in the inferotemporal, superotemporal, superonasal, and temporal sectors in the order of strength of association. In the subgroup analysis by disease category, IOP fluctuation showed greater association with global RNFL thinning in eyes with primary angle closure glaucoma (P = .010) than in eyes without glaucomatous changes (P = .07).

Conclusions: In treated PACD eyes, large IOP fluctuation is an independent predictor for subsequent progressive RNFL thinning in addition to high mean IOP during follow-up.

Keywords: Primary Angle Closure, Intraocular pressure; retinal nerve fiber layer.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Humans
Intraocular Pressure*
Nerve Fibers*
Prospective Studies
Retinal Ganglion Cells
Tomography, Optical Coherence / methods
Tonometry, Ocular