Related Experiment Video
Updated: Jul 30, 2026
07:51
Full-Field Optical Coherence Microscopy for Histology-Like Analysis of Stromal Features in Corneal Grafts
Published on: October 21, 2022
Transparency, swelling and scarring in the corneal stroma
K M Meek1, D W Leonard, C J Connon
1Cardiff Institute of Tissue Engineering and Repair, Cardiff University, Cardiff, UK. Meekkm@cf.ac.uk
Eye (London, England)
|November 25, 2003
Summary
Corneal swelling causes uneven fluid distribution, with posterior lamellae hydrating more than anterior ones. The direct summation of fields model explains light scattering in swollen corneas but not after phototherapeutic keratectomy (PTK).
Area of Science:
- Ophthalmology
- Biophysics
- Corneal Science
Background:
- Corneal transparency is crucial for vision.
- Understanding light scattering mechanisms in the cornea is essential for diagnosing and treating corneal diseases.
- Current models offer partial explanations for altered corneal transparency.
Purpose of the Study:
- To review existing explanations for corneal transparency.
- To utilize a computational model to explain increased light scattering associated with corneal swelling and phototherapeutic keratectomy (PTK).
Main Methods:
- Employed the direct summation of fields (DSF) method to calculate light transmission.
- Utilized structural parameters derived from electron micrographs and X-ray diffraction data.
- Swelled corneal stroma sections to observe hydration effects.
Main Results:
- Fluid distribution during corneal swelling is non-uniform, with greater hydration in posterior lamellae.
- The DSF model accounts for a 20% increase in light scattering in edematous corneas due to fibril disordering, refractive index mismatch, and increased thickness.
- The DSF model did not attribute increased light scattering after PTK to newly deposited collagen.
Conclusions:
- Corneal swelling involves differential hydration of stromal lamellae, influenced by glycosaminoglycans and lamellar structure.
- The DSF model successfully explains light scattering in edematous corneas.
- The DSF model is insufficient to explain haze formation post-PTK.
Related Concept Videos
01:25Glaucoma: Overview
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
01:24Healing II: Complications
Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...