In 31 eyes having undertaken intraocular lens(I0L)implantation with vitreous loss, closed system automated anterior vitrectomy was performed.Corrected visual acuty of 0.5 or better was 68% after follow-up of 8.8 months.The result showed that automated anterior vitrectomy furnished beneficial condition to posterior chamber I0L implantation. （Chin J Ocul Fundus Dis,1996,12: 25- 26）