Fibrillopathia epitheliocapsularis (pseudoexfoliation): a clinical and electron microscope study

Area of Science:

• Ophthalmology
• Cell Biology
• Pathology

Background:

• Pseudoexfoliation syndrome is characterized by the deposition of fibrillar material in the anterior segment of the eye.
• The exact origin and composition of this pseudoexfoliative material remain areas of active research.

Purpose of the Study:

• To present detailed light and electron microscopic findings from two cases of fibrillopathia epitheliocapsularis (pseudoexfoliation).
• To characterize the morphology and distribution of pseudoexfoliative deposits.
• To discuss the potential sources of the material and the utility of scanning electron microscopy in pathological studies.

Main Methods:

• Light microscopy (LM) was used to examine tissue samples.
• Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were employed for ultrastructural analysis.
• Histopathological examination of ciliary processes, iris, and lens capsule.

Main Results:

• Feathery, eosinophilic deposits were observed on the ciliary processes, posterior iris, and pre-equatorial lens capsule via LM.
• Electron microscopy revealed deposits composed of a fine meshwork of fibrils (200-300 Å) on epithelial cell surfaces and basement membranes.
• SEM provided valuable insights into the pathological features of the pseudoexfoliative material.

Conclusions:

• Pseudoexfoliative material consists of fine fibrils deposited on ocular surfaces and within basement membranes.
• The study highlights the contribution of SEM in elucidating the ultrastructure of pathological deposits.
• Further research is needed to fully understand the pathogenesis and implications of pseudoexfoliation.