Due to the nature of boxing and other combat sports, structural damage to the facial region, including the eyes, is common. Because of this, it is thought that boxing poses a high risk of altered visual acuity. Whilst epidemiological studies have investigated the occurrence of facial and eye injuries, there have not yet been any studies recreating the biomechanics of punching utilizing a facial model.
Models were created using a structured symmetry mesh, based off of CT/MRI recreation of the human face. A deformable glove model was used to deliver punches at a speed, force, and contact angle designed to simulate a strong hook punch to the frontal (at an angle of 0 degrees) and zygomatic (at an angle of 20 degrees) bones.
The force used for this study was significantly less than the force required to cause bony failure to the frontal and zygomatic bones of the skull. All areas of the eye were stressed to a much greater degree with frontal impact compared to zygomatic impact.
Stress to the iris, lens and ciliary body was in the lateral circumference, which may cause damage to the ocular muscles and impair eye function.
Whilst this study using a 3D biomechanical model contributes to our understanding of the impact of punching force to specific anatomical structures around the eye, care needs to be taken in extrapolating these findings to to a live dynamic human model, whilst is likely to respond to trauma in a much more complicated fashion.