Ciliary muscle dimensions by swept‐source optical coherence tomography and correlation study in a large population

• Published in: Acta ophthalmologica (Oxford, England) Vol. 98; no. 4; pp. e487 - e494
• Main Authors: Fernández‐Vigo, José Ignacio, Shi, Hang, Kudsieh, Bachar, Arriola‐Villalobos, Pedro, De‐Pablo Gómez‐de‐Liaño, Lucía, García‐Feijóo, Julián, Fernández‐Vigo, José Ángel
• Format: Journal Article
• Language: English
• Published: England Wiley Subscription Services, Inc 01.06.2020
• Subjects: Adolescent; Adult; Age; Aged; Aged, 80 and over; Anterior chamber; anterior chamber angle; Child; Child, Preschool; ciliary body; Ciliary Body - diagnostic imaging; ciliary muscle; Cross-Sectional Studies; Female; Gender; Glaucoma - diagnosis; Glaucoma - epidemiology; Glaucoma - physiopathology; Humans; Incidence; intraocular pressure; Intraocular Pressure - physiology; Male; Middle Aged; myopia; optical coherence tomography; Population studies; Population Surveillance - methods; Prognosis; Reproducibility of Results; Retrospective Studies; Sex differences; Spain - epidemiology; Tomography; Tomography, Optical Coherence - methods; Young Adult; Spain; myopia; intraocular pressure; ciliary body; anterior chamber angle; optical coherence tomography; ciliary muscle
• ISSN: 1755-375X; 1755-3768; 1755-3768
• DOI: 10.1111/aos.14304

Purpose To examine ciliary muscle (CM) dimensions in vivo by swept‐source optical coherence tomography (SS‐OCT) in a large healthy population. To assess the reproducibility of CM measurements and correlations with different parameters. Methods In this cross‐sectional study, the following CM measurements were made in 495 eyes of 495 subjects in the temporal and nasal quadrants: length (CML), area (CMA) and thickness at distances of 1000 μm (CMT1), 2000 μm (CMT2) and 3000 μm (CMT3) from the scleral spur using the SS‐OCT DRI‐Triton® (Topcon, Tokyo, Japan). These dimensions were then assessed for correlations with the factors age, gender, refractive error, anterior chamber angle (ACA) and intraocular pressure (IOP). The reproducibility of CM measurements was determined in 85 of the participants. Results Mean age was 41.4 ± 17.5 years (range 5–83). The following means were recorded as follows: CML = 4.57 ± 0.73 mm (range 2.16–6.97), CMA = 1.35 ± 0.31 mm2 (2.04–5.45), CMT1 = 558 ± 98 μm (299–891), CMT2 = 366 ± 100 μm (89–629) and CMT3 = 210 ± 75 μm (36–655). Negative correlation was detected between CML/CMA and age (R = −0.516/R = −0.404; p < 0.001) and refractive error (R = −0.519/R = −0.538; p < 0.001). No gender differences were observed (p ≥ 0.150). Both CML and CMA were correlated with ACA (R = 0.498 and 0.546; p < 0.001) and slightly with IOP (R = −0.175; p < 0.001). The reproducibility of the CM measurements was excellent (intraclass correlation coefficient ≥0.878). Conclusions Swept‐source optical coherence tomography is a valid tool for in vivo CM measurements. Our data indicate a larger CM in myopes and its diminishing size with age.