Oval lipid corneal opacities in beagles

Area of Science:

• Ophthalmology
• Veterinary Pathology
• Corneal Diseases

Background:

• Naturally occurring corneal opacities were observed in an experimental beagle dog colony.
• These opacities were located at the junction of the middle and inferior thirds of the cornea.

Purpose of the Study:

• To investigate the microscopic characteristics of naturally occurring corneal opacities in beagle dogs.
• To elucidate the cellular and extracellular changes associated with these corneal abnormalities.

Main Methods:

• Light microscopy was utilized to examine the corneal tissues.
• Electron microscopy was employed for detailed ultrastructural analysis of the affected corneal stroma.

Main Results:

• Abnormalities were confined to the anterior corneal stroma.
• Extracellular rhomboid crystalline spaces and spherical/elliptical vacuolar spaces were identified.
• Vacuolar spaces distorted stromal lamellae and contained electron-dense amorphous debris.
• Stromal keratocytes exhibited hyperplasia, degeneration, and necrosis.

Conclusions:

• The observed corneal opacities in beagle dogs are associated with distinct stromal abnormalities.
• These include extracellular crystalline and vacuolar spaces, and significant alterations in stromal keratocytes.
• The findings suggest a pathological process affecting the corneal stroma and its cellular components.