Risk 1. Negative pressure suction loss
Because there is too much liquid on the corneal surface, the patient's fixation is poor or the eyeball suddenly turns, and the conjunctiva embedded in the gap between the negative pressure cone mirror and the cornea loses negative pressure during femtosecond laser scanning, which makes the laser scanning stop automatically.
The treatment method is as follows:
Laser cutting technology of (1) microlens bottom
(2) If the laser microlens undercut process is >: 10% and the negative pressure is lost near the central axis, it is suggested to temporarily stop using SMILE, change to FS-LASIK or choose SMILE.
(3) If the bottom cutting process of the lens has been completed and the negative pressure is lost when cutting the lens sideways, you can resume laser scanning from the side cutting (pay attention to alignment) or reduce the side cutting diameter of the lens by 0.2~0.4 mm.
(4) If the bottom cutting process and the side cutting process of the lens are completed, and the negative pressure disappears during the scanning process of the corneal cap, the cap can be re-made without changing the original treatment parameters, but attention must be paid to centering at this time.
(5) When the circumferential incision is scanned, the negative pressure disappears, and the circumferential incision can be re-scanned or mechanically cut without changing the original treatment parameters. Pay attention to aim at the original center as much as possible when re-attracting.
Risk 2: There are dark spots in the laser scanning area.
In the process of laser scanning, the corneal stroma can appear dark areas with different colors from the scanned areas, which are similar to black spots, also known as black areas, and are areas where femtosecond laser can not produce effective results. The common causes are foreign bodies in light path, corneal epithelial injury and low laser energy.
Handling principle:
1, targeted prevention of "black spots"
2. According to the position, size and density of "black spots", choose to continue or terminate the operation.
3. In the case of continuous separation, the "black spot" area should be separated first to avoid using sharp instruments for separation. The appearance of black areas in the scanning area will increase the difficulty of separating lenses, so it is necessary to separate lenses carefully. Excessive separation may make the tip of the instrument penetrate the corneal surface, make the corneal surface heal irregularly, even form scars or scars, and even lead to lens tearing.
4. When the operation is stopped, carefully find the reason and scan again or postpone the operation.
Risk 3, residual corneal lens
Due to abnormal laser energy, thin lens, severe OBL, dark spots, sharp instrument use or irregular surgical operation, the lens is torn or the lens tissue is not completely removed.
Handling principle:
1, optimize the surgical design and improve the surgical skills (skilled separation skills, water infiltration separation);
2. Avoid using sharp separation tools;
3. Evaluate the residual lens. For a small amount of lens fragments that do not affect visual function (such as the length within 1~2 mm and the width within 1 mm), no treatment is required.
4. Larger lens fragments should be removed.
Xi' an Huaxia ophthalmology hospital
Xi 'an Huaxia Eye Hospital is an all-femtosecond myopia laser surgery hospital of Huaxia Eye Group in Xi 'an, and also an eye specialist hospital in Shaanxi. The German Zeiss VisuMax full femtosecond laser system introduced by the hospital is favored by nearsighted people for its safety and comfort.
How much does Xi 'an myopia surgery need?
Xi An Huaxia Eye Hospital held a 1 1 month preferential activity, and all femtosecond, semi-femtosecond and ICL crystal implants enjoyed the activity! Full femtosecond prize1111yuan! Half-femtosecond first prize discount 4000 yuan! ! ! ICL crystal implantation is 26,800 yuan! ! !
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