METHODS: The following four visual functional parameters: accommodation(accommodative response; accommodative microfluctuation; accommodative facility; PRA, positive relative accommodation; NRA, negative relative accommodation; gradient AC/A, the gradient accommodative convergence to accommodation ratio), vergence(DBI, distance base-in; DBO, distance base-out; NBI, near base-in; NBO, near base-out), phoria(distance and near lateral phoria), and stereopsis were measured for nineteen health participants before and after viewed 2D TV for 90min and 3D TV for 90min.

RESULTS: Both compared with the baseline data and the data after 2D viewing, increased near accommodative responses, decreased convergence, changed phoria(more exophoric)at distance were detected after 3D TV viewing(all P <0.05).

CONCLUSION: Prolonged viewing of 3D TV will influence human visual function, especially the disruption of the natural relationship between binocular convergence and accommodation induced by conflicting stimulus. Manufacturers and the public should consider the parameters of accommodation, vergence, and phoria as main indicators for detecting the safety of 3D TV.