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Abnormal transient myopia in symptomatic individuals after sustained nearwork
1State University of New York, State College of Optometry, Department of Vision Sciences, New York, USA.
Summary
Patients experiencing blurred distance vision after near work may have abnormal transient myopia. Objective measurements confirmed a significant myopic shift and slower recovery in these individuals.
Area of Science:
- Ophthalmology
- Vision Science
- Physiological Optics
Background:
- Some individuals report transient blurred distance vision after prolonged near work.
- This phenomenon, termed "abnormal transient myopia," has lacked objective documentation.
- Understanding this transient refractive change is crucial for diagnosing visual disturbances.
Purpose of the Study:
- To objectively document and characterize "abnormal transient myopia" after near work.
- To compare the refractive responses of affected individuals with those of asymptomatic controls.
- To investigate potential underlying mechanisms related to the accommodative system.
Main Methods:
- Utilized a Canon R-1 infrared autorefractor for rapid (2-second interval) refractive state assessment.
- Measured distance refractive error immediately before and after a standardized binocular near task.
- Included three individuals reporting symptoms and a control group of asymptomatic individuals.
Main Results:
- Demonstrated a significant myopic shift in refractive state immediately post-near work in symptomatic individuals.
- Observed a slower decay of the myopic shift towards baseline in affected individuals.
- Noted increased variability in refractive responses compared to the control group.
Conclusions:
- The study provides objective evidence for "abnormal transient myopia" after near work.
- Findings suggest a link between transient distance blur and accommodative system abnormalities.
- Further research is warranted to elucidate the precise mechanisms of this transient myopia.