What is the thickest corneal layer?

The thickest corneal layer is the stroma. This central layer constitutes about 90% of the cornea's thickness and is primarily composed of collagen fibers, which are organized in a parallel fashion. This unique structure provides the cornea with strength, resilience, and transparency, which are crucial for its role in focusing light onto the retina. The stroma also contains keratocytes, which are specialized cells crucial for maintaining the corneal structure and health. Understanding the composition and thickness of the stroma helps in comprehending various clinical situations, including corneal diseases and surgical procedures, such as LASIK, where the integrity of this layer is critical for optimal outcomes.