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3-D viewing significantly alters near point of accommodation and convergence
Accommodation and binocular vergence are the key ophthalmological factors that significantly influence asthenopia after viewing 3-D displays, according to a study.
Ophthalmological factors and subjective symptoms were analyzed at baseline and after watching 3-D and 2-D displays in 30 adult subjects with no ophthalmological abnormalities.
Measurements included near point of accommodation, near point of convergence, amplitude of fusional convergence and divergence, stereopsis, tear break-up time, temperature of ocular surface, and angle of phoric deviation before and after viewing displays for 30 minutes. Subjects also took a survey on subjective symptoms.
After viewing 3-D displays for 30 minutes, subjects demonstrated a significant increase in near point of accommodation (P = .016) and near point of convergence (P = .013). Increases in amplitude of fusional convergence and stereopsis were not statistically significant.
Subjects reported statistically significant differences between 3-D and 2-D viewing in all subjective symptoms, including pain, dullness, headache, diplopia, burning, irritation, dryness, tearing, blurred vision and dizziness.