Structure of the human vitreoretinal border region

Area of Science:

• Ophthalmology
• Cell Biology
• Histology

Background:

• The vitreoretinal border region, including the inner limiting membrane (ILM), is crucial for retinal health.
• Understanding age-related changes in the ILM and associated fibrils is important for diagnosing and treating retinal diseases.

Purpose of the Study:

• To investigate the morphology of the vitreoretinal border region.
• To examine age-related changes in the thickness and structural elements of the ILM.
• To analyze regional variations in ILM thickness and fibril characteristics.

Main Methods:

• Scanning and transmission electron microscopy were used.
• The study included human fetal and adult eyes across various age decades.
• Four distinct regions of each eye were analyzed: macular, optic disc, equatorial, and ora serrata.

Main Results:

• The fetal ILM was thin and uniformly thick, except in the macular region.
• Adult ILM showed regional thickness differences, with the macula being the thickest.
• No significant correlation was found between age and ILM thickness in adults.
• Fibril diameter near the ILM showed minimal variation and no age or regional correlation.
• Fibril length varied significantly by region, being longest at the ora serrata and shortest in the macula.

Conclusions:

• The inner limiting membrane exhibits regional thickness variations in adult human eyes.
• Age does not appear to significantly influence ILM thickness or the diameter of adjacent fibrils.
• Fibril length is regionally dependent, suggesting specific structural roles in different retinal areas.