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Dynamic volume-rendered optical coherence tomography pupillometry

Maloca, Peter M; de Carvalho, Emanuel R; Hasler, Pascal W; Balaskas, Konstantinos; Inglin, Nadja; Petzold, Axel; Egan, Catherine; ... Valmaggia, Philippe; + view all (2022) Dynamic volume-rendered optical coherence tomography pupillometry. Acta Ophthalmologica , 100 (6) pp. 654-664. 10.1111/aos.15063. Green open access

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Abstract

Purpose: To assess intrapupillary space (IPS) changes in healthy subjects with regard to decreased iris motility in patients with pseudoexfoliation glaucoma (PEXG) or non-arteritic anterior ischaemic optic neuropathy (NAION) in a feasibility study in a clinical environment. Methods: Scotopic and photopic IPS measurements using three-dimensionally rendered swept-source optical coherence tomography (SS-OCT) data were obtained and compared for all subjects. Intrapupillary space (IPS) parameters were evaluated such as absolute volumetric differences, relative light response for volumetric ratios and pupillary ejection fraction (PEF) for functional contraction measurements. Results: From a total of 122 IPS from 66 subjects, 106 IPS were eligible for comparison providing values for 72 normal, 30 PEXG and 4 NAION eyes. In healthy, PEXG and NAION subjects, scotopic overall mean IPS was 8.90, 3.45 and 4.16 mm3, and photopic overall mean IPS was 0.87, 0.74 and 1.13 mm3, respectively. Three-dimensional contractility showed a mean absolute difference of 8.03 mm3 for normals (defined as 100% contractility), 2.72 mm3 for PEXG (33.88% of normal) and 3.03 mm3 for NAION (38.50% of normal) with a relative light response ratio between scotopic and photopic volumes of 10.26 (100%), 4.69 (45.70%) and 3.67 (35.78%), respectively. Pupillary ejection fraction (PEF) showed a contractile pupillary emptying of 88.11% for normals, 76.92% for PEXG and 70.91% for NAION patients. Conclusion: This 3D pupillometry OCT assessment allows for quantitative measurements of pupil function, contractility and response to light. More specifically, PEF is presented as a potential (neuro)-pupillary outcome measure that could be useful in the monitoring of ophthalmic disorders that affect pupillary function.

Type: Article
Title: Dynamic volume-rendered optical coherence tomography pupillometry
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/aos.15063
Publisher version: https://doi.org/10.1111/aos.15063
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Life Sciences & Biomedicine, Ophthalmology, pupillary ejection fraction, contractility, optical coherence tomography, pseudoexfoliation glaucoma, non-arteritic anterior ischaemic optic neuropathy, PUPIL DILATATION, ANTERIOR-CHAMBER, AQUEOUS-HUMOR, ILLUMINATION, SIZE, FLOW, AGE, 3D
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 Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Clinical and Movement Neurosciences
URI: https://discovery.ucl.ac.uk/id/eprint/10161967
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