TY - JOUR
T1 - Shape analysis of rectus extraocular muscles with age and axial length using anterior segment optical coherence tomography
AU - Shibata, Kiyo
AU - Fujiwara, Atsushi
AU - Hamasaki, Ichiro
AU - Shimizu, Takehiro
AU - Kono, Reika
AU - Kanenaga, Keisuke
AU - Nakazawa, Masanori
AU - Morizane, Yuki
N1 - Publisher Copyright:
Copyright © 2020 Shibata et al.
PY - 2020/12
Y1 - 2020/12
N2 - Purpose: This study aimed to evaluate the shape of the extraocular muscles (EOMs) in normal subjects using the en-face images of anterior segment optical coherence tomography (ASOCT). The EOM insertion and the direction of the muscle fibers were investigated. Subjects and methods: A total of 97 healthy normal subjects (194 eyes) at Okayama University Hospital (age, 47.1 ±21.5 years; range, 8-79 years) participated in the study. A series of 256 tomographic images of the rectus EOMs were captured using the C-scan function of the AS-OCT (CASIA2, TOMEY Co., Japan), and the images were converted to en-face images in multiTIFF format. The anterior chamber angle to EOM insertion distance (AID) and the angle of the muscle fibers from the insertion site (angle of muscles) were measured from the images. The correlations of AID and angle of muscles with age and axial length were investigated and evaluated. Results: AID and angle of muscles were significantly correlated with age or axial length in some EOMs. The AIDs of medial rectus (MR) (P = 0.000) and superior rectus (SR) (P = 0.005) shortened with age. The AIDs of MR (P = 0.001) and inferior rectus (IR) (P = 0.035) elongated with axial length, whereas lateral rectus (LR) (P = 0.013) shortened. The angles of MR (P = 0.001) and LR (P = 0.000) were found to have a more downward direction toward the posterior in older subjects. Conclusion: En-face images can be created by AS-OCT, and the shape of the EOMs in normal subjects using these image measurements was available. With the ability to assess the EOMs, AID and angle of muscles are expected give useful information for treating and diagnosing strabismus-related diseases.
AB - Purpose: This study aimed to evaluate the shape of the extraocular muscles (EOMs) in normal subjects using the en-face images of anterior segment optical coherence tomography (ASOCT). The EOM insertion and the direction of the muscle fibers were investigated. Subjects and methods: A total of 97 healthy normal subjects (194 eyes) at Okayama University Hospital (age, 47.1 ±21.5 years; range, 8-79 years) participated in the study. A series of 256 tomographic images of the rectus EOMs were captured using the C-scan function of the AS-OCT (CASIA2, TOMEY Co., Japan), and the images were converted to en-face images in multiTIFF format. The anterior chamber angle to EOM insertion distance (AID) and the angle of the muscle fibers from the insertion site (angle of muscles) were measured from the images. The correlations of AID and angle of muscles with age and axial length were investigated and evaluated. Results: AID and angle of muscles were significantly correlated with age or axial length in some EOMs. The AIDs of medial rectus (MR) (P = 0.000) and superior rectus (SR) (P = 0.005) shortened with age. The AIDs of MR (P = 0.001) and inferior rectus (IR) (P = 0.035) elongated with axial length, whereas lateral rectus (LR) (P = 0.013) shortened. The angles of MR (P = 0.001) and LR (P = 0.000) were found to have a more downward direction toward the posterior in older subjects. Conclusion: En-face images can be created by AS-OCT, and the shape of the EOMs in normal subjects using these image measurements was available. With the ability to assess the EOMs, AID and angle of muscles are expected give useful information for treating and diagnosing strabismus-related diseases.
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U2 - 10.1371/journal.pone.0243382
DO - 10.1371/journal.pone.0243382
M3 - Article
C2 - 33362229
AN - SCOPUS:85099045954
VL - 15
JO - PLoS One
JF - PLoS One
SN - 1932-6203
IS - 12 December
M1 - e0243382
ER -