Convergence defects in patients with temporomandibular disorders

Area of Science:

• Ophthalmology
• Dentistry
• Neurology

Background:

• Temporomandibular disorders (TMD) involve pain and dysfunction in the jaw joint and muscles.
• Ocular convergence defects (OCD) affect the eyes' ability to turn inward, impacting near vision.
• Previous research suggests potential links between musculoskeletal and visual systems.

Purpose of the Study:

• To investigate the correlation between ocular convergence defects and temporomandibular disorders in adult subjects.
• To determine if TMD patients exhibit a higher prevalence of OCD compared to a control group.
• To explore associations between OCD and specific TMD symptoms.

Main Methods:

• A case-control study involving 48 adult TMD patients and 48 age- and gender-matched controls.
• Ocular convergence was assessed using two tests: convergence near point and Berens prism test.
• Data analysis focused on comparing the prevalence of OCD between the TMD and control groups.

Main Results:

• A statistically significant higher percentage (p < 0.0001) of ocular convergence defects was observed in the TMD group (75%) compared to the control group (21%).
• TMD patients with OCD reported a strong association with limited maximal jaw opening and myofascial pain.
• Headaches and neck stiffness (torcicollis) were reported more frequently in subjects with compromised convergence.

Conclusions:

• Ocular convergence defects are significantly more prevalent in individuals with temporomandibular disorders.
• The findings suggest a potential link between jaw dysfunction and visual system impairments.
• Further research is warranted to understand the underlying mechanisms and clinical implications of this association.