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Related Experiment Videos

Convergent strabismic amblyopia in cats.

S G Crewther, D P Crewther, B G Cleland

    Experimental Brain Research
    |January 1, 1985
    PubMed
    Summary

    Surgically induced strabismus in kittens affects visual acuity. Myectomy of eye muscles caused greater retinal ganglion cell deficits than tenotomy, indicating neural deficits are linked to muscle removal, not just image quality.

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    Altered expression of alternatively spliced isoforms of the mRNA NMDAR1 receptor in the visual cortex of strabismic cats.

    Molecular vision·2001

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Developmental Biology

    Background:

    • Strabismus, or eye misalignment, can lead to amblyopia (lazy eye).
    • Previous research has explored the effects of different surgical methods to induce strabismus on visual function.

    Purpose of the Study:

    • To investigate the impact of two distinct surgical methods for inducing esotropia (inward eye turning) on the visual acuity of retinal ganglion cells in kittens.
    • To compare the neural and morphological consequences of strabismus induced by myectomy versus tenotomy.

    Main Methods:

    • Esotropia was surgically induced in kittens using either myectomy of the lateral rectus and superior oblique muscles or tenotomy of the lateral rectus.
    • Behavioral visual acuity testing using square wave gratings was performed.
    • Physiological measurements of cut-off spatial frequencies were recorded from retinal ganglion cells.
    • Morphological analysis of cells in the lateral geniculate nucleus was conducted.

    Main Results:

    • Kittens with surgically induced strabismus exhibited amblyopia in the affected eye, with significantly reduced visual acuities (1.0-2.5 cyc/deg) compared to the non-deviating eye (6.0-7.5 cyc/deg).
    • Myectomized cats showed a ~20% loss in retinal ganglion cell cut-off spatial frequency compared to normal and tenotomized cats.
    • Lateral geniculate nucleus analysis revealed cell shrinkage in myectomized cats, but not in tenotomized cats, suggesting differing neural impacts.

    Conclusions:

    • The surgical removal of extraocular muscle (myectomy) in inducing strabismus leads to significant neural deficits in the retina.
    • These findings suggest that the neural deficits observed in strabismic amblyopia are more closely related to the surgical manipulation of eye muscles than to the optical quality of the retinal image.

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