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Related Experiment Videos

Is all asthenopia the same?

James E Sheedy1, John N Hayes, Jon Engle

  • 1The Ohio State University, College of Optometry, Columbus, OH 43218, USA. sheedy2@osu.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 25, 2003
PubMed
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Eye strain symptoms and their locations differ based on the cause. This study identified two distinct patterns of discomfort, suggesting different sensory pathways for asthenopia.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Ergonomics

Background:

  • Asthenopia, or eye strain, can result from various visual conditions.
  • Understanding the specific sensations and their locations is crucial for diagnosis and management.

Purpose of the Study:

  • To investigate if the type and location of asthenopia symptoms vary depending on the underlying causative condition.
  • To differentiate symptom patterns associated with different visual tasks and environmental factors.

Main Methods:

  • Twenty subjects with normal vision performed eight reading tasks under different conditions designed to induce asthenopia.
  • Subjects reported symptom intensity and location after reaching a defined level of discomfort.
  • Conditions included mixed astigmatism, close viewing, upward gaze, dry eyes, lens changes, small font, glare, and flickering light.

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Main Results:

  • Most symptom sensations (except blur) were significantly related to the inducing condition (p<0.003).
  • Two distinct symptom patterns emerged: External Symptom Factor (ESF) related to dryness and front/bottom eye sensations, and Internal Symptom Factor (ISF) related to ache/strain behind the eyes.
  • ESF was linked to glare, dry eyes, and small fonts, while ISF was associated with close viewing and refractive conditions.

Conclusions:

  • Asthenopia symptoms and their locations can effectively distinguish between different causative conditions.
  • The findings support the existence of at least two distinct symptom clusters and associated sensory pathways for eye strain.