By Erna E. Kritzinger
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Extra info for A Colour Atlas of Optic Disc Abnormalities
This makes the instrument parfocal with the surgeon’s eyes. The slit-lamp should be used with ×25 magnification. Too high a magnification can reduce the field whereas, too less magnification will provide with a reduced detail. Preoperatively, Apraclonidine eye drops are instilled to reduce the chances of post-laser spike of IOP. Paracaine eye drops instilled immediately before the procedure is sufficient to give adequate anesthesia for placing Gonio lens in the eyes. 1 sec, energy of 400600 mw.
F) the lower site is chosen in silicon filled eye because the silicon oil floats and can go to upper site and block the iridotomy. LASERS USED Several lasers can be used. But the commonly used lasers are Nd: YAG and argon. We will describe here the YAG laser iridotomy. Nd: YAG Laser Iridotomy This is most frequently applied method for laser iridotomy. There are several advantages of using YAG laser. This produces extremely high energy, which acts by mechanical disruption. When compared to argon laser, it does not require pigment for absorption for its thermal effect.
If IOP is reduced and the angle is open, the patient may be treated medically with topical low dose pilocarpine, aqueous suppressants and steroids, until the eye quiets and laser iridotomy may be performed. 7. If IOP is unchanged or elevated and angle remains closed. Lens related angle closure should be suspected, further pilocarpine is withheld and the attack broken by argon laser peripheral iridoplasty. Peripheral iridoplasty does not eliminate pupillary block and is not a substitute for laser iridotomy, which must be performed as soon as the eye is quiet.