Risk 1: Negative pressure loss
Due to excessive corneal surface liquid, poor fixation of the patient or sudden rotation of the eye, the conjunctiva embedded in the gap between the negative pressure cone lens and the cornea, etc., resulting in the loss of negative pressure in the process of femtosecond laser scanning, so that the laser scanning terminates on its own.
Treatment is as follows:
(1) The laser carries out the cutting process of the bottom of the microlens <10% when the negative pressure is lost, you can restart scanning. At this time, the machine will automatically pop up whether to carry out a quick restart selection menu, choose to continue, the original treatment program does not make any changes.
(2) If the laser microlens bottom cutting process >10% and close to the mid-axis area when the negative pressure is lost, it is recommended to temporarily terminate SMILE, change to FS-LASIK or optional SMILE.
(3) If the lens bottom cutting process has been completed, in the side cut lens when the negative pressure is lost, you can start from the side cut to continue the laser scanning (pay attention to the alignment) or you can reduce the diameter of lens side cut by 0.3%, or you can start from the side cut to continue laser scanning (attention to alignment).
(4) If the bottom of the lens has been cut and the side cut is completed, and the negative pressure is lost when the corneal cap is scanned, the original treatment parameters can be changed and the cap can be made again, but attention must be paid to the center of the alignment.
(5) When scanning the circumferential incision when the negative pressure is lost, may not change the original treatment parameters, re-scanning the circumferential incision or mechanical incision. Pay attention to re-attraction with the original center alignment as much as possible.
Risk two, laser scanning area black spot
In the laser scanning, the corneal stroma can appear with the scanning area of a different color of the dark area, shaped like a black spot, also known as the black zone, for the femtosecond laser failed to produce an effective effect of the region. The common causes are foreign objects in the optical path area, corneal epithelial damage, and low laser energy.
Treatment principles:
1, targeted prevention of "black spot" causes
2, according to the "black spot" site, size, density, choose to continue or terminate the operation
3, continue to separate In this case, the separation of the "black spot" area should be completed first, avoiding the use of sharp instruments for separation. The appearance of the black zone in the scanning area will make it more difficult to separate the lens, so the separation of the lens must be careful, careful, too much force separation may cause the tip of the instrument to penetrate the corneal surface, so that the corneal surface irregular healing, or even the formation of scarring or scar opacities, but also can cause the lens to tear.
4. Stop the surgical case, carefully search for the cause of the occurrence, and scan again or postpone the surgery
Risk 3, corneal lens residue
Lens tear or incomplete removal of lens tissue due to abnormal laser energy, thin lens, severe OBL, black spot, use of sharp instruments, or irregular surgical operation.
Principles of treatment:
1. Optimize the surgical design and improve the surgical skills (skilled separation techniques, water infiltration separation);
2. Avoid the use of sharp separating instruments;
3. Evaluate the residual lens, and for the small amount of lens fragments (e.g., within 1-2 mm in length and 1 mm in width) that are located in the limbal area without affecting the visual function may not be treated. The residual lenses are evaluated.
4. Larger lens fragments should be removed.
Xi'an Huaxia Eye Hospital
Xi'an Huaxia Eye Hospital is a full femtosecond laser surgery hospital in Xi'an under the Huaxia Eye Group, and a specialized ophthalmology hospital in Shaanxi. The German Zeiss VisuMax full femtosecond laser system introduced in the hospital is highly favored by myopic people for its safety and comfort.
How much does myopic surgery cost in Xi'an?
Xi'an Huaxia Eye Hospital held a November promotion, full femtosecond, semi-femtosecond, ICL crystal implantation are enjoying activities! Full Femtosecond Grand Prize of 11,111 RMB! Semi-femtosecond first prize discount of 4000 RMB! ICL crystal implantation is 26,800 RMB!
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