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Related Experiment Videos

Congenital myopic esotropia: a case study.

F Thorn, J Gwiazda, S Shimojo

    American Journal of Optometry and Physiological Optics
    |January 1, 1986
    PubMed
    Summary

    Congenital myopia in infants can lead to esotropia (inward eye turn). Corrective lenses can align eyes and improve vision, but discontinuing wear may reverse these gains, impacting visual development.

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    Area of Science:

    • Ophthalmology
    • Pediatric Optometry
    • Developmental Neuroscience

    Background:

    • Congenital myopia is a refractive error present from birth.
    • Esotropia is a condition where one or both eyes turn inward.
    • Early visual experience significantly influences the development of binocular vision and vergence control.

    Observation:

    • An infant with congenital myopia developed a 20-delta left esotropia at 8 months of age.
    • Ocular alignment was achieved with -4.00 D spectacle correction, with eyes becoming esotropic upon removal.
    • Best corrected visual acuity was initially reduced in both eyes, with the left eye significantly poorer.

    Findings:

    • Part-time spectacle wear from 8 to 12 months improved visual acuity to equal levels in both eyes.
    • Discontinuation of spectacle wear at 12 months led to the loss of response to minus lenses for strabismus and reappearance of amblyopia in the left eye.
    • This suggests that myopic infants may cease bifixating blurred images beyond their far point, impacting convergence relaxation.

    Implications:

    • Infant visual experience plays a critical role in establishing tonic vergence posture and the AC/A (accommodative convergence/accommodation) ratio.
    • Early and consistent correction of refractive errors in infants is crucial for normal visual development and preventing amblyopia and strabismus.
    • This case highlights the dynamic interplay between refractive error, visual input, and the development of oculomotor control systems in early childhood.

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