AIM: To analyze the visual evoked potentials(VEP)of 189 eyes subjected to traumatic injury, and to explore the feasibility and method to applying VEP technology to the evaluation of visual acuity after eye trauma.

METHODS: All the objects were volunteers who were grouped according to a random examination with the international standard visual acuity chart. The study determined spatial frequency in stimulation mode, P₁₀₀ amplitude and latency. Then, the lowest spatial frequency(LSF)was analyzed and its relationship with visual acuity were studied. Finally this study discussed about the way to evaluate visual acuity with VEP and also compared the VEP evaluation results with the visual acuity chart.

RESULTS: The LSF of 22', 11', 5', and 3' corresponded respectively to vision of 0.1-0.2, 0.3-0.5, 0.6-1.0, 1.2-1.5. There was a significant difference in P₁₀₀ amplitude between eyes with different visual acuity, but there was no significant difference in P₁₀₀ latency between these eyes. The random evaluation results of VEP combined with LSF and P₁₀₀ amplitude were highly consistent with the results with international standard visual acuity chart.

CONCLUSION: It is practicable to evaluate these volunteers' visual acuity with the VEP technology.