In this procedure a PMMA ( a form of plastic ) ring is inserted in cornea at two thirds total stromal depth utilizing a channeling device to create an intrastromal channel in corneal periphery on both the sides. It results in corneal flattening and reduces the power.
- As the procedure is done in corneal periphery the central integrity is maintained which is used for vision. So there is no chance of glare and halos which may make night driving difficult in other refractive procedures.
- By removing the rings we can reverse the procedure and so by changing the rings we can change the power.
- Procedure is safe and done under drop of anesthesia.
However the procedure is limited for correction of power till 4.0Dioptres.