Chen KH, et al. - In patients with retina vein occlusion (RVO), authors measured the serum oxidative biomarker to gauge further physical response. Findings suggested an increase in the serum level of malondialdehyde (MDA), 8OHdG and hydrogen peroxide in patients with RVO. Among these, increasing of serum oxidative stress in RVO patients was suggested by the elevation of MDA, 8OHdG and hydrogen peroxide. They noted a decrease in aLL enzymes related reactive oxygen species scavenge. Therefore, systemic oxidative stress within serum may be increased by the focal RVO.