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Related Experiment Videos

Lid interaction and toric soft lens axis location

A Tomlinson, M M Bibby

    American Journal of Optometry and Physiological Optics
    |March 1, 1982
    PubMed
    Summary

    Toric soft lens rotation was assessed, finding that lenses with cylinder axis at 90 degrees (against-the-rule) had more acceptable truncation locations. Over-refraction is not clinically reliable for determining lens axis location.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Biomedical Engineering

    Background:

    • Toric soft lenses correct astigmatism by incorporating a cylindrical power and a specific axis.
    • Lens rotation can alter the effective power and axis, impacting visual correction.
    • Understanding factors influencing toric lens stability is crucial for effective design and patient outcomes.

    Purpose of the Study:

    • To evaluate the rotational stability of truncated toric soft lenses.
    • To determine the influence of cylinder power and axis on lens truncation location.
    • To assess the clinical reliability of over-refraction for measuring toric lens axis location.

    Main Methods:

    • Fifteen subjects were fitted with truncated toric soft lenses (1-4 D cylinder, axes 90° and 180°).
    • Lens truncation location was measured via slitlamp photography and spherocylindrical over-refraction after 30 minutes of wear.
    • Blink-initiated lens rotation was quantified using slitlamp photography.

    Main Results:

    • No significant difference in truncation location was found between cylinder axes 90° and 180°.
    • Cylinder power did not significantly affect truncation location.
    • Toric lenses with cylinder at axis 90° (against-the-rule) showed significantly more acceptable truncation locations (within 25° of horizontal).
    • A significant correlation existed between axis mislocation and blink-initiated rotation.
    • High correlation between photographic and over-refraction measurements of axis location, but large variance makes over-refraction clinically unreliable.

    Conclusions:

    • Toric lens design with cylinder at axis 90° may offer improved rotational stability.
    • Blink-induced rotation is a significant factor in toric lens axis mislocation.
    • Spherocylindrical over-refraction is not a suitable clinical method for determining toric lens axis location due to significant variance.

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