[Morphological findings in progressive esotropia with high myopia]

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Anatomy

Context:

• High myopia, a refractive error, is associated with axial elongation of the eyeball.
• Esotropia, an inward turning of the eye, can occur in individuals with high myopia.
• Understanding the biomechanical factors contributing to this condition is crucial for diagnosis and management.

Purpose:

• To quantitatively demonstrate and compare the axial length and transverse size of eyeballs in patients with high myopia and esotropia versus those with high myopia alone and healthy controls.
• To investigate the relationship between eyeball dimensions and the presence of esotropia in the context of high myopia.

Summary:

• Magnetic resonance imaging (MRI) was used to measure the outer axial length and maximum transverse size of eyeballs in three groups: myopic esotropia (n=5), high myopia without esotropia (n=8), and controls (n=10).
• Results showed significantly greater outer axial lengths in the myopic esotropia group (31.6 mm) compared to the high myopia group (27.9 mm) and controls (23.7 mm) (p < 0.01).
• Maximum transverse size was also greater in the myopic esotropia group (25.0 mm) than controls (23.1 mm), though similar to the high myopia group (24.9 mm).

Impact:

• The study provides clear evidence of eyeball elongation in patients with myopic esotropia.
• Findings suggest that an outer axial length exceeding 30 mm in high myopia may increase the likelihood of developing esotropia.
• This research contributes to the understanding of the pathophysiology of myopic esotropia and may inform clinical risk assessment.