Ciliary muscles in the human eye cannot relax like skeletal muscles
The claim that human ciliary muscles cannot relax is incorrect; the ciliary muscle is a smooth muscle that regularly contracts and relaxes to adjust the focal length of the eye's lens.
The claim states that ciliary muscles cannot relax like skeletal muscles (though ciliary muscles are actually smooth muscle). Physiological evidence on accommodation and zonular tension demonstrates that the ciliary muscle must relax during disaccommodation to flatten the lens. None of the provided papers support the claim, while papers discussing accommodation and ciliary-muscle training directly refute it.
Bassnett S. Zinn's zonule.. 2021. https://doi.org/10.1016/j.preteyeres.2020.100902
The ciliary muscle contracts and relaxes to alter the tension of Zinn's zonules, flattening or thickening the lens during accommodation and disaccommodation.
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Zhou S, Zhang M, Zheng W, Yin R, Chen G. Effects of physical activity combined with different visual target presentation durations of ciliary-muscle training on visual acuity in children.. 2023. https://doi.org/10.3389/fpubh.2023.1191112
Ciliary-muscle training exercises rely on the normal physiological ability of the ciliary muscle to repeatedly contract and relax to improve visual function and accommodative facility.
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