[Pathogenesis and treatment of accommodative disturbance]

Area of Science:

• Ophthalmology and Optometry
• Neuroscience
• Physiology

Context:

• Accommodative disturbances are common and can significantly impact visual function.
• Factors such as visual fatigue, prolonged near work, and neurological conditions can influence accommodation.
• Current methods for assessing accommodative function may not fully capture dynamic changes.

Purpose:

• To investigate the relationship between tonic accommodation, pupillary unrest, and various accommodative disturbances.
• To explore the impact of factors like visual fatigue, near-vision tasks, and autonomic nervous system activity on accommodation.
• To evaluate the utility of computer-assisted infrared optometry and pupillography in diagnosing and understanding accommodative abnormalities.

Summary:

• Computer-assisted infrared optometry and pupillography were used to assess tonic accommodation (dark focus) and quasi-static accommodative response.
• Visual fatigue, prolonged computer use, and certain medical conditions (e.g., eyestrain, head/neck injury, hyperthyroidism) induced myopic shifts, refractive fluctuations, and pupillary unrest.
• Low-dose cyclopentolate hydrochloride showed efficacy in treating accommodative abnormalities in computer workers, and quasi-static accommodation measurements differentiated between accommodative spasm and palsy after injury.

Impact:

• The study highlights the importance of evaluating tonic accommodation and pupillary unrest for a comprehensive understanding of visual disturbances.
• Findings suggest potential therapeutic targets and diagnostic approaches for conditions involving abnormal accommodation.
• This research contributes to the understanding of the complex interplay between the autonomic nervous system and visual function.