Do rectus muscle parameters vary between emmetropes and myopes?

Abstract

This study investigated the thickness, area, and insertion site of the medial (MR) and lateral (LR) rectus muscles in individuals with emmetropia and different degrees of myopia.Methods: Swept-source optical coherence tomography images of the MR and LR muscles in 80 participants including emmetropes (spherical equivalent refractive error [SER] ±0.50 D, N = 14) and myopes (≤ −0.75 D, N = 66), were analysed. Customdesigned, semi-automated software was used to measure parameters such as insertion distance from limbus, muscle thickness at every 1 mm interval to 3 mm periphery and muscle area from insertion site to 3 mm. How to cite this article: Vasudeva A, Dhakal R, Vupparaboina KK, Verkicharla PK. Do rectus muscle parameters vary between emmetropes and myopes?

High Myopia and Thickness of Extraocular and Masticatory Muscles—7T MRI, Preliminary Study

“…When considering the thickness of the muscles in people with high myopia, similar values to the studies of Pierro et al of the medial rectus and lateral rectus muscles [ 36 ] were noted, and differences were observed between the superior rectus and inferior rectus muscle. Differences between emmetropic and myopic subjects concerning muscle changes have also been reported in studies [ 26 , 36 ].…”

“…In our opinion, the most significant correlations are between the lateral rectus muscle and an axial length eyeball and the inferior rectus muscle and visual acuity ( Table 4 ). A study by Vasudev et al noted that medial rectus muscle parameters showed a significant relationship with myopia [ 26 ]. The cited authors point out that the role in myopiaogenesis of this muscle needs further research.…”

“…The extraocular muscles (superior rectus, inferior rectus, medial rectus and lateral rectus) were chosen because they are the most important four muscles responsible for eye movements [ 12 ]. In addition, a recent study (2021) showed that parameters of rectus muscles are connected with myopia [ 26 ]. The muscles of the masticatory organ (temporalis and masseter muscles) were chosen because they are the largest muscles affecting the temporomandibular joint [ 15 ].…”