Multisectorial changes in the ciliary muscle during accommodation measured with high-resolution optical coherence...

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optometry

Background:

• Accommodation is a crucial visual function involving ciliary muscle changes.
• Understanding the biomechanics of accommodation is vital for diagnosing and managing visual disorders.
• Anterior chamber optical coherence tomography (OCT) offers high-resolution imaging of ocular structures.

Purpose of the Study:

• To quantify anterior ciliary muscle dimensional changes across different ocular sectors during accommodation.
• To correlate these ciliary muscle alterations with induced vergence demand.
• To investigate the sector-specific biomechanical responses of the anterior ciliary muscle.

Main Methods:

• Utilized anterior chamber optical coherence tomography (OCT) to measure the anterior ciliary muscle in 24 healthy subjects.
• Assessed muscle dimensions across nasal, superior, temporal, and inferior sectors at varying accommodative demands (0 to -3 D vergence).
• Employed a linear model to analyze the relationship between ciliary muscle area and accommodative demand.

Main Results:

• A significant increase in anterior ciliary muscle area was observed with accommodation in all measured sectors.
• Maximum area increases reached approximately 30% in nasal-temporal sectors and 25% in inferior-temporal sectors.
• A positive correlation trend was noted between ciliary muscle area changes and vergence demand.

Conclusions:

• Anterior ciliary muscle area demonstrates a tendency to increase symmetrically with accommodation.
• Findings contribute to a better understanding of accommodation biometry and biomechanics.
• Results may inform future research on ocular accommodation and related conditions.