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Peripapillary scleral thickness in perfusion-fixed normal monkey eyes
J Crawford Downs1, Richard A Blidner, Anthony J Bellezza
1Department of Biomedical Engineering, Tulane University, New Orleans, LA 70112, USA.
Investigative Ophthalmology & Visual Science
|July 2, 2002
Summary
The peripapillary scleral thickness in monkey eyes varies with distance from the optic nerve and is thinnest nasally. These variations in scleral thickness are crucial for understanding intraocular pressure (IOP) effects.
Area of Science:
- Ophthalmology
- Biomechanics
- Anatomy
Background:
- Accurate computational models of intraocular pressure (IOP) effects require precise tissue dimensions.
- The sclera's role in IOP-related stress and strain is critical for ocular health.
Purpose of the Study:
- To measure the thickness of the peripapillary sclera in normal monkey eyes.
- To provide data for developing accurate computational models of IOP-related stress and strain.
Main Methods:
- Perfusion fixation of nine normal rhesus monkey eyes at an IOP of 10 mm Hg.
- Trephination of a 6-mm scleral specimen and sectioning into 4-microm sagittal slices.
- Measurement of peripapillary scleral thickness at 100-microm intervals from the posterior scleral canal opening (PSCO).
Main Results:
- Peripapillary scleral thickness varied significantly with distance from the PSCO in all quadrants.
- The sclera was thinnest near the PSCO, progressively thickened to the mid-periphery, and thinned again peripherally.
- The nasal quadrant peripapillary sclera was significantly thinner than in superior, inferior, and temporal quadrants.
Conclusions:
- Peripapillary scleral thickness in normal monkey eyes exhibits significant regional variation.
- The nasal sclera is notably thinner, which likely influences IOP-related stress and strain distribution.
- These findings are essential for biomechanical modeling of the optic nerve head region.