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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
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Eye shape illusions induced by eyebrow positions.

Soyogu Matsushita, Kazunori Morikawa, Saya Mitsuzane

    Perception
    |October 2, 2015
    PubMed
    Summary

    Eyebrow position significantly impacts how we perceive eye shape and size. Lower eyebrows make eyes appear larger, while higher ones make them seem smaller, influencing facial perception.

    Area of Science:

    • Psychology
    • Vision Science
    • Perception

    Background:

    • Facial feature perception is complex.
    • The influence of eyebrows on perceived eye characteristics is not fully understood.

    Purpose of the Study:

    • To investigate how eyebrow position affects perceived eye inclination and size.
    • To explore the mechanisms behind these visual illusions.

    Main Methods:

    • Psychophysical measurements were used to assess perception.
    • Experiments manipulated eyebrow inclination, eyebrow-eye distance, and eyebrow curvature.
    • Perceived eye inclination and size were recorded.

    Main Results:

    • Eyes were perceived to incline in the same direction as the eyebrows.

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  • Lower eyebrow positions made eyes appear larger; higher positions made them appear smaller.
  • Eyebrow curvature did not affect perceived eye size, and eye-eyebrow distance did not alter the eye inclination illusion.

    • Conclusions:

    • Eyebrow position plays a crucial role in modulating perceived eye size and inclination.
    • These findings suggest distinct assimilation processes for eye size and inclination illusions.
    • Understanding these illusions has implications for face perception and potential applications.