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Millimetric cover test--a linear strabismometric technique

G P Paliaga, A Ghisolfi, G Giunta

    Journal of Pediatric Ophthalmology and Strabismus
    |September 1, 1980
    PubMed
    Summary
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    This study quantifies eye rotations, finding each millimeter of limbus shift correlates to approximately 4.6-4.8 degrees of eye movement. This provides a basis for a simple clinical method to measure strabismic angles.

    Area of Science:

    • Ophthalmology
    • Oculomotor Research
    • Strabismus Evaluation

    Background:

    • Accurate measurement of strabismic angles is crucial for diagnosis and treatment.
    • Existing methods like the prism cover test can be complex or limited in certain situations.

    Purpose of the Study:

    • To establish a quantitative relationship between limbus shifts and angular eye rotations.
    • To validate a simple, ruler-based method for measuring strabismic angles.

    Main Methods:

    • Ten normal subjects participated in the study.
    • Angular rotations of the globe (adduction and abduction) were measured.
    • Corresponding limbus shifts ranging from 1 to 7 mm were recorded.

    Main Results:

    Related Experiment Videos

  • A temporal limbus shift of 1 mm corresponded to an average adduction of 4.6 degrees.
  • A nasal limbus shift of 1 mm corresponded to an average abduction of 4.8 degrees.

    • Conclusions:

    • The findings support a foundational method for clinical strabismus evaluation using a millimeter ruler to measure limbus shifts.
    • This technique offers a practical alternative to the simultaneous prism and cover test, especially for variable strabismus angles and diverse gaze positions.