Snake spectacle vessel permeability to sodium fluorescein

Area of Science:

• Ophthalmology
• Herpetology
• Comparative Physiology

Background:

• The snake spectacle, a transparent scale covering the eye, plays a crucial role in vision and protection.
• Understanding vascular dynamics within the spectacle is vital for diagnosing and treating eye conditions in snakes.

Purpose of the Study:

• To evaluate vascular permeability of the snake spectacle using sodium fluorescein.
• To compare fluorescein leakage during resting and shedding phases of the ecdysis cycle in ball pythons.

Main Methods:

• Ball pythons (Python regius) underwent anesthesia and spectral domain optic coherence tomography.
• Fluorescein angiography was performed using a digital single-lens reflex camera and intracardiac sodium fluorescein injection.
• Angiographic images captured fluorescein transit through the iris and spectacle vasculature, analyzed as pseudovideo streams.

Main Results:

• Fluorescein angiograms of the snake spectacle were successfully acquired.
• Significant variation in vascular permeability was observed correlating with the ecdysis cycle phase.
• Pronounced fluorescein leakage was evident during the shedding phase.

Conclusions:

• Fluorescein angiography is a viable method for visualizing snake spectacle vasculature.
• Increased vascular permeability during shedding suggests active physiological changes related to ecdysis.
• This technique offers potential for studying snake spectacle health, including dysecdysis and integumentary issues.