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Retinal Function in X-Linked Juvenile Retinoschisis.

Lucia Ambrosio1, Ronald M Hansen1, Rotem Kimia1

  • 1Department of Ophthalmology, Boston Children's Hospital & Harvard Medical School, Boston, Massachusetts, United States.

Investigative Ophthalmology & Visual Science
|November 21, 2019
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Summary

X-linked juvenile retinoschisis (XLRS) affects rod photoreceptors and postreceptor retinal function in young patients. This study found smaller retinal function amplitudes in XLRS patients, indicating dysfunction beyond postreceptors.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Retinal Diseases

Background:

  • X-linked juvenile retinoschisis (XLRS) is a genetic disorder affecting vision.
  • XLRS is known to impact postreceptor retinal components and may affect photoreceptors.
  • Assessing early-stage retinal function in XLRS is crucial for understanding disease progression.

Purpose of the Study:

  • To evaluate retinal function in pediatric patients diagnosed with XLRS.
  • To investigate the specific components of retinal function affected by XLRS, including photoreceptors and postreceptors.
  • To determine if XLRS-related retinal function changes are age-dependent in young individuals.

Main Methods:

  • Electroretinography (ERG) was performed on 12 XLRS patients (ages 1-15).
  • Scotopic and photopic full-field stimuli were used to assess rod and cone function.
  • Calculated ERG parameters included photoreceptor (SROD, RROD, SCONE, RCONE) and postreceptor (log σ, VMAX) responses.

Main Results:

  • XLRS patients exhibited reduced scotopic and photopic a- and b-wave amplitudes compared to controls.
  • Significantly lower saturated photoresponse amplitude (RROD) and postreceptor function (log σ, VMAX) were observed in XLRS patients.
  • Cone photoreceptor function (SCONE, RCONE) and rod photoreceptor response (SROD) were not significantly different from controls.

Conclusions:

  • XLRS impacts both postreceptor retinal pathways and rod photoreceptor function.
  • Reduced RROD and a-wave amplitudes suggest direct involvement of rod photoreceptors in XLRS.
  • Retinal function parameters in young XLRS patients did not show significant age-related changes.