Abstract
There are 2 types of eyestrain:
Internal symptoms
- Ache or pain felt inside the eye
- Caused by convergence and accommodative stress, refractive error
- Caused by eye conditions
External symptoms (dry eye symptoms)
- Dryness or irritation on the front of the eye
- Caused by conditions that compromise the quality of the visual stimulus
What Eye Doctors Know:
- Accommodative and/or vergence stress cause symptoms (internal)
- Exophoria is typically more comfortable than esophoria
- Convergence is much easier than divergence
- There is considerable variation in phoria and ZSCBV across patients
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