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Spectral domain optical coherence tomography imaging of spectacular ecdysis in the royal python (Python regius).

Charlotte A Tusler1, David J Maggs, Philip H Kass

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Summary

Spectral domain optical coherence tomography (SD-OCT) effectively visualized snake ocular changes during ecdysis. This imaging technique revealed detailed transformations of the spectacle and cuticle, aiding in understanding snake eye health.

Keywords:
corneacuticleophidiasnakespectaclesubspectacular space

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Area of Science:

  • Ophthalmology
  • Herpetology
  • Veterinary Medicine

Background:

  • The ophidian spectacle, a transparent structure covering the eye, undergoes significant changes during ecdysis (shedding).
  • Understanding these changes is crucial for diagnosing and treating anterior segment diseases in snakes.

Purpose of the Study:

  • To document the dynamic changes in the snake spectacle, cuticle, and cornea during the ecdysis cycle.
  • To evaluate the utility of spectral domain optical coherence tomography (SD-OCT) in visualizing these ocular structures in snakes.

Main Methods:

  • Four royal pythons (Python regius) were monitored daily throughout a complete shed cycle.
  • Ocular imaging was performed using SD-OCT, digital slit-lamp biomicroscopy, and external photography.
  • SD-OCT captured nasal, axial, and temporal views of the anterior segment.

Main Results:

  • SD-OCT provided high-resolution images of the spectacle, cuticle, subcuticular space (SCS), and cornea.
  • The spectacle thickened and separated into cuticular and stromal layers, forming the SCS during ecdysis.
  • The cornea remained unchanged, while the subspectacular space (SSS) was more distended peripherally.

Conclusions:

  • SD-OCT is a valuable tool for imaging the snake anterior segment, particularly the spectacle and cornea, during all stages of ecdysis.
  • The peripheral spectacle may be an ideal site for diagnostic or therapeutic interventions within the SSS.