The effects of full femtosecond and semi-femtosecond on dry eye are as follows:
The incision of corneal recognition structure made by full femtosecond laser is very small, which will retain more nerve fibers. In addition, it does not need to ablate the whole cornea that needs laser cutting, but only needs to be separated, so its cumulative thermal damage to the cornea is also small. In the postoperative clinical observation, there are also many papers confirming that the whole flight is better than the half flight in the problem of dry eye after operation.
The application range of full femtosecond is from myopia 200 degrees to-1000 degrees; The application range of semi-femtosecond is 600-degree hyperopia to 1200-degree myopia. From the perspective of application, the range of semi-femtosecond is larger than that of full femtosecond, which also reflects from one side that the requirements of semi-femtosecond on patients' own conditions are lower than that of full femtosecond. Because the degree of full femtosecond is too low, the separated corneal tissue is not easy to pull out, and the separated corneal tissue may break, which is more troublesome. If it is too high, it will not work, because the thickness of the fully flying fish membrane structure is about 1 10, while the semi-flying fish membrane structure can be 90 microns.
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