Cycloscopy and fluorescein cycloscopy of the ciliary process

Area of Science:

• Ophthalmology
• Anatomy
• Physiology

Background:

• The ciliary body is crucial for aqueous humor dynamics and intraocular pressure regulation.
• Age-related changes in the ciliary process can impact ocular health.
• Observing the ciliary process and chamber angle requires specialized instrumentation.

Purpose of the Study:

• To introduce a novel gonio-cycloscope for detailed observation of the ciliary process and chamber angle.
• To investigate age-related morphological changes in the ciliary process.
• To assess the influence of intraocular pressure and pharmacological agents on ciliary process fluorescein leakage.

Main Methods:

• Development and utilization of a gonio-cycloscope with 1.5x magnification.
• Histological and visual examination of the ciliary process in relation to aging.
• Fluorescein leakage assays under varying intraocular pressures (IOP).
• Administration of water and oral glycerol to evaluate their effects on leakage.

Main Results:

• Aging led to ciliary process hypertrophy, increased branching, and discoloration.
• Fluorescein leakage from the ciliary process diminished with elevated IOP, ceasing at ≥50 mm Hg.
• Water intake accelerated fluorescein leakage, whereas oral glycerol administration reduced it.

Conclusions:

• The gonio-cycloscope is effective for visualizing ciliary body structures and dynamics.
• Intraocular pressure significantly modulates ciliary process vascular permeability.
• Pharmacological interventions like glycerol may influence aqueous humor dynamics by affecting ciliary process leakage.