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Porcine sclera: thickness and surface area.
Timothy W Olsen1, Scott Sanderson, Xiao Feng
1Department of Ophthalmology, University of Minnesota, Minneapolis, Minnesota 55455, USA. olsen010@tc.umn.edu
Investigative Ophthalmology & Visual Science
|July 31, 2002
Summary
Porcine scleral thickness and surface area were measured, revealing similarities to human sclera. This makes the porcine model valuable for transscleral drug delivery research.
Area of Science:
- Ophthalmology
- Comparative Anatomy
- Biomedical Engineering
Background:
- The sclera, the white outer layer of the eye, plays a crucial role in maintaining ocular structure and integrity.
- Understanding scleral properties is essential for developing effective drug delivery methods to the posterior segment of the eye.
Purpose of the Study:
- To quantitatively assess the thickness and surface area of porcine sclera across different pig sizes.
- To evaluate the suitability of the porcine sclera as a model for human ocular studies, particularly for transscleral drug delivery.
Main Methods:
- Porcine globes were sectioned, and scleral thickness was measured at 1-mm intervals from the limbus to the optic nerve.
- Scleral surface area was calculated using computerized digital tracing software after dissecting scleral tissue into small pieces.
Main Results:
- Scleral thickness varied with pig size, being thickest near the limbus (0.83-1.12 mm) and decreasing towards the optic nerve.
- Mean scleral surface area ranged from 7.78 to 11.92 cm², also varying with pig size.
Conclusions:
- Porcine scleral thickness closely resembles that of human sclera.
- The anatomical similarities support the use of the porcine model for transscleral drug delivery research.