{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,18]],"date-time":"2026-07-18T08:52:17Z","timestamp":1784364737412,"version":"3.55.0"},"reference-count":124,"publisher":"National Institute for Health and Care Research","issue":"4","license":[{"start":{"date-parts":[[2018,1,1]],"date-time":"2018-01-01T00:00:00Z","timestamp":1514764800000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/www.nationalarchives.gov.uk\/doc\/non-commercial-government-licence\/non-commercial-government-licence.htm"}],"funder":[{"DOI":"10.13039\/501100000664","name":"Health Technology Assessment programme","doi-asserted-by":"publisher","award":["11\/129\/245"],"award-info":[{"award-number":["11\/129\/245"]}],"id":[{"id":"10.13039\/501100000664","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100004319","name":"Pfizer","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100004319","id-type":"DOI","asserted-by":"publisher"}]},{"name":"NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust"},{"name":"UCL Institute of Ophthalmology"},{"DOI":"10.13039\/501100010313","name":"Heidelberg Engineering","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100010313","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100002806","name":"Carl Zeiss Meditec AG","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100002806","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Optovue"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Health Technol Assess"],"abstract":"<jats:sec id=\"abs1-1\"><jats:title>Background<\/jats:title><jats:p>Progressive optic nerve damage in glaucoma results in vision loss, quantifiable with visual field (VF) testing. VF measurements are, however, highly variable, making identification of worsening vision (\u2018progression\u2019) challenging. Glaucomatous optic nerve damage can also be measured with imaging techniques such as optical coherence tomography (OCT).<\/jats:p><\/jats:sec><jats:sec id=\"abs1-2\"><jats:title>Objective<\/jats:title><jats:p>To compare statistical methods that combine VF and OCT data with VF-only methods to establish whether or not these allow (1) more rapid identification of glaucoma progression and (2) shorter or smaller clinical trials.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-3\"><jats:title>Design<\/jats:title><jats:p>Method \u2018hit rate\u2019 (related to sensitivity) was evaluated in subsets of the United Kingdom Glaucoma Treatment Study (UKGTS) and specificity was evaluated in 72 stable glaucoma patients who had 11 VF and OCT tests within 3 months (the RAPID data set). The reference progression detection method was based on Guided Progression Analysis\u2122 (GPA) Software (Carl Zeiss Meditec Inc., Dublin, CA, USA). Index methods were based on previously described approaches [Analysis with Non-Stationary Weibull Error Regression and Spatial enhancement (ANSWERS), Permutation analyses Of Pointwise Linear Regression (PoPLR) and structure-guided ANSWERS (sANSWERS)] or newly developed methods based on Permutation Test (PERM), multivariate hierarchical models with multiple imputation for censored values (MaHMIC) and multivariate generalised estimating equations with multiple imputation for censored values (MaGIC).<\/jats:p><\/jats:sec><jats:sec id=\"abs1-4\"><jats:title>Setting<\/jats:title><jats:p>Ten university and general ophthalmology units (UKGTS) and a single university ophthalmology unit (RAPID).<\/jats:p><\/jats:sec><jats:sec id=\"abs1-5\"><jats:title>Participants<\/jats:title><jats:p>UKGTS participants were newly diagnosed glaucoma patients randomised to intraocular pressure-lowering drops or placebo. RAPID participants had glaucomatous VF loss, were on treatment and were clinically stable.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-6\"><jats:title>Interventions<\/jats:title><jats:p>24-2 VF tests with the Humphrey Field Analyzer and optic nerve imaging with time-domain (TD) Stratus OCT\u2122 (Carl Zeiss Meditec Inc., Dublin, CA, USA).<\/jats:p><\/jats:sec><jats:sec id=\"abs1-7\"><jats:title>Main outcome measures<\/jats:title><jats:p>Criterion hit rate and specificity, time to progression, future VF prediction error, proportion progressing in UKGTS treatment groups, hazard ratios (HRs) and study sample size.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-8\"><jats:title>Results<\/jats:title><jats:p>Criterion specificity was 95% for all tests; the hit rate was 22.2% for GPA, 41.6% for PoPLR, 53.8% for ANSWERS and 61.3% for sANSWERS (all comparisons<jats:italic>p<\/jats:italic>\u2009\u2264\u20090.042). Mean survival time (weeks) was 93.6 for GPA, 82.5 for PoPLR, 72.0 for ANSWERS and 69.1 for sANSWERS. The median prediction errors (decibels) when the initial trend was used to predict the final VF were 3.8 (5th to 95th percentile 1.7 to 7.6) for PoPLR, 3.0 (5th to 95th percentile 1.5 to 5.7) for ANSWERS and 2.3 (5th to 95th percentile 1.3 to 4.5) for sANSWERS. HRs were 0.57 [95% confidence interval (CI) 0.34 to 0.90;<jats:italic>p<\/jats:italic>\u2009=\u20090.016] for GPA, 0.59 (95% CI 0.42 to 0.83;<jats:italic>p<\/jats:italic>\u2009=\u20090.002) for PoPLR, 0.76 (95% CI 0.56 to 1.02;<jats:italic>p<\/jats:italic>\u2009=\u20090.065) for ANSWERS and 0.70 (95% CI 0.53 to 0.93;<jats:italic>p<\/jats:italic>\u2009=\u20090.012) for sANSWERS. Sample size estimates were not reduced using methods including OCT data. PERM hit rates were between 8.3% and 17.4%. Treatment effects were non-significant in MaHMIC and MaGIC analyses; statistical significance was altered little by incorporating imaging.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-9\"><jats:title>Limitations<\/jats:title><jats:p>TD OCT is less precise than current imaging technology; current OCT technology would likely perform better. The size of the RAPID data set limited the precision of criterion specificity estimates.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-10\"><jats:title>Conclusions<\/jats:title><jats:p>The sANSWERS method combining VF and OCT data had a higher hit rate and identified progression more quickly than the reference and other VF-only methods, and produced more accurate estimates of the progression rate, but did not increase treatment effect statistical significance. Similar studies with current OCT technology need to be undertaken and the statistical methods need refinement.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-11\"><jats:title>Trial registration<\/jats:title><jats:p>Current Controlled Trials ISRCTN96423140.<\/jats:p><\/jats:sec><jats:sec id=\"abs1-12\"><jats:title>Funding<\/jats:title><jats:p>This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in<jats:italic>Health Technology Assessment<\/jats:italic>; Vol. 22, No. 4. See the NIHR Journals Library website for further project information. Data analysed in the study were from the UKGTS. Funding for the UKGTS was provided through an unrestricted investigator-initiated research grant from Pfizer Inc. (New York, NY, USA), with supplementary funding from the NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK. Imaging equipment loans were made by Heidelberg Engineering, Carl Zeiss Meditec and Optovue (Fremont, CA, USA). Pfizer, Heidelberg Engineering, Carl Zeiss Meditec and Optovue had no input into the design, conduct, analysis or reporting of any of the UKGTS findings or this work. The sponsor for both the UKGTS and RAPID data collection was Moorfields Eye Hospital NHS Foundation Trust. David F Garway-Heath, Tuan-Anh Ho and Haogang Zhu are partly funded by the NIHR Biomedical Research Centre based at Moorfields Eye Hospital and UCL Institute of Ophthalmology. David F Garway-Heath\u2019s chair at University College London (UCL) is supported by funding from the International Glaucoma Association.<\/jats:p><\/jats:sec>","DOI":"10.3310\/hta22040","type":"journal-article","created":{"date-parts":[[2018,1,31]],"date-time":"2018-01-31T11:16:28Z","timestamp":1517397388000},"page":"1-106","update-policy":"https:\/\/doi.org\/10.3310\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":37,"title":["Combining optical coherence tomography with visual field data to rapidly detect disease progression in glaucoma: a diagnostic accuracy study"],"prefix":"10.3310","volume":"22","clinical-trial-number":[{"clinical-trial-number":"isrctn96423140","registry":"10.18810\/isrctn","type":"results"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8611-1155","authenticated-orcid":true,"given":"David F","family":"Garway-Heath","sequence":"first","affiliation":[{"name":"National Institute for Health Research (NIHR) Biomedical Research Centre, Moorfields 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2078-2073","authenticated-orcid":true,"given":"Katy","family":"Morgan","sequence":"additional","affiliation":[{"name":"Department of Medical Statistics, London School of Hygiene & Tropical Medicine, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0098-9915","authenticated-orcid":true,"given":"Chris","family":"Frost","sequence":"additional","affiliation":[{"name":"Department of Medical Statistics, London School of Hygiene & Tropical Medicine, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8754-3902","authenticated-orcid":true,"given":"David P","family":"Crabb","sequence":"additional","affiliation":[{"name":"Division of Optometry and Visual Science, School of Health Sciences, City, University of London, London, 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