retinal hole cryotherapy

In the case of retinal detachment surgery, closed holes, small pupils or refractive interstitial opacity, when photocoagulation is difficult, the treatment of distant peripheral retinal tears or degenerative areas can be used for cryocoagulation. Treatment of diseases: retinal tear retinal detachment Indication In the case of retinal detachment surgery, closed holes, small pupils or refractive interstitial opacity, when photocoagulation is difficult, the treatment of distant peripheral retinal tears or degenerative areas can be used for cryocoagulation. Contraindications 1. Severe proliferative vitreoretinopathy. 2. Severe vitreous hemorrhage with retinal detachment. 3. The macular hole is combined with retinal detachment. 4. Large or multiple retinal tears combined with retinal detachment. Preoperative preparation 1. Regular disinfection of the skin. 2. Adjust the pressure of the freezer to 5.5~6kPa. The gas can be nitrous oxide ("Laughter") or carbon dioxide. Surgical procedure 1. When the retinal detachment is high, first release the subretinal fluid and then condense. When the condensing head is pressed against the rupture hole, the foot valve is opened again, and the retina has a white reaction. The condensation reaction encloses the entire hole and the adjacent condensation chambers may partially overlap. Condensation is preferably carried out under an indirect ophthalmoscope. 2. Prophylactic condensation of retinal tears can be performed directly on the conjunctiva. When the split hole is behind, the conjunctival sac can be opened to condense on the sclera. It is preferable to open the conjunctival sac in the hole near the attachment point of the rectus muscle so as to extend the freezing head below the muscle if necessary. complication 1. Choroidal hemorrhage: When the frozen pen head is not completely thawed, the freezing pen is forcibly removed. 2. New retinal tears: too strong freezing can cause retinal necrosis or enlarged pores, as well as new formation of holes. 3. Choroidal detachment, exudative retinal detachment: often occurs after extensive retinal freezing, without causing recent complications. 4. Eyelid frostbite.