Radial keratotomy in non-human primate eyes

Area of Science:

• Ophthalmology
• Veterinary Medicine
• Surgical Research

Background:

• Radial keratotomy (RK) is a refractive surgical procedure to correct myopia.
• Understanding RK's long-term effects on corneal structure and function is crucial.
• Owl monkeys serve as a valuable model for studying ocular surgery due to corneal similarities with humans.

Purpose of the Study:

• To investigate the effects of 16-incision versus 8-incision radial keratotomy in owl monkeys.
• To correlate clinical observations with histopathological and ultrastructural findings.
• To determine the causes of variability in surgical outcomes.

Main Methods:

• Prospective study comparing 16-incision and 8-incision RK.
• Clinical assessments included corneal curvature, thickness, endothelial cell count, and intraocular pressure.
• Histopathological and ultrastructural analysis of corneal tissue over time.

Main Results:

• Loss of corneal flattening correlated with wound contracture, confirmed histopathologically.
• Significant endothelial cell loss (14-15%) was observed, attributed to postsurgical inflammation.
• Variability in surgical incision depth led to diverse patient responses.

Conclusions:

• Radial keratotomy in owl monkeys leads to notable endothelial cell loss and wound contracture.
• Incision depth variability is a key factor in the inconsistent outcomes of RK.
• Further research into optimizing RK surgical technique is warranted.