Conclusion. CPW is a feasible procedure for anterior decompression and fusion, with safety, complete decompression, and high fusion rate, as long as indicatie patients are selected.

However, there is a relatively high rate of spontaneous visual recovery and no evidence that surgical decompression of the optic nerve provides any additional benefit.

It is much attention of the fractal image compression method because of its high compression rate and the simple mean of decompression . But the effect of the compression is not good.