n. the removal of the whole or part of the vitreous humour of the eye. Anterior vitrectomy is removal of the front portion of the vitreous humour. Vitrectomy is often required to remove a nonresolving vitreous haemorrhage and also as a part of surgical procedures on the retina, including repair of a detached retina.
(detached retina) separation of the inner nervous layer of the *retina from the outer pigmented layer (retinal pigment epithelium, RPE). It commonly occurs when a break (hole or tear) allows fluid from the vitreous cavity of the eyeball to accumulate under the retina (rhegmatogenous) but can also occur when fluid accumulates by leakage from the RPE (nonrhegmatogenous). Vision is lost in the affected part of the retina. The retina can be reattached by surgical means, such as external *plombage or internal *vitrectomy, or by creating patches of scar tissue between the retina and the choroid by application of extreme cold (see cryosurgery) or heat (see photocoagulation).... retinal detachment
Health Encyclopedia