Pre-operative U vision laser examination has three purposes.
1. To determine whether the myopic patient is suitable for surgical treatment;
2, If myopic patients can operate, what kind of vision effect will be achieved after the surgery?
3, the doctor can design a personalized surgical plan for the myopic patient based on the patient’s preoperative examination data.
Detailed consultation and comprehensive and accurate preoperative examination is the first step to successful U-vision femtosecond laser surgery!
I. Professional consultation.
(1) Before surgery, you should communicate with your doctor in detail and really understand the expected results that can be achieved by the surgery.
(2) Due to differences in life or work, each person has different expectations of vision, such as painters or molders, who may need clear near vision, and drivers who need clear distance vision, letting the physician understand your expectations is the first step to successful surgery.
Second, detailed pre-operative examination steps are as follows.
1.Visual acuity examination: to understand the bare eye distance and near vision of myopic patients and the corrected visual acuity of glasses worn since.
2, computerized optometry examination: preliminary understanding and differentiation of myopic friends’ myopia, hyperopia, astigmatism, corneal curvature and other data.
3.Non-contact ophthalmometer examination: to understand the internal pressure of the eye to exclude the possibility of high eye pressure and glaucoma.
4, three-dimensional analysis of the anterior segment: the main purpose is to understand the regularity and symmetry of the entire corneal surface of the eye, to exclude various abnormal factors, especially the possibility of typical cone corneas, sub-cone corneas and flat corneas.
5, comprehensive optometry examination: this examination can be accurately derived from the myopic patient’s refractive error, the correct degree of optometry or not directly affect the effect of surgery. In addition, stereopsis, visual balance, dominant eye, hidden strabismus and other visual functions can be examined.
6.Wavefront aberration examination: This technology is the most cutting-edge optometric technology today, originated from space technology, wavefront aberration examination can detect the different distribution of myopia in the same eye, wavefront aberration data-guided excimer laser, myopia in different parts of the eye for the real sense of “personalized” treatment. Currently, wavefront aberration surgery has become the mainstream of myopia surgery in developed countries in Europe and the United States.
7.Dilated pupil examination: After the pupil is dilated, the eye’s adjustment is completely relaxed, at this time, the examination can be carried out, and the true myopia and astigmatism can be obtained, but this data is only used as a reference when the surgical parameters are adjusted.
8, fundus retinal examination: exclude serious vitreous lesions, serious retinal lesions (retinal detachment, retinal hemorrhage, retinal fissure, retinitis, etc.)
9. Slit lamp examination of the anterior segment of the eye: focus on corneal transparency, presence of scars, cloudiness of the lens, presence of conjunctivitis, keratitis, dacryocystitis, blepharitis, severe inverted eyelashes, etc.
10. Corneal thickness test, eye axis length measurement: to understand the thickness of the cornea and the length of the eye axis, so as to determine the nature of myopia. For patients with central corneal thickness below 500 microns, if they are highly myopic, attention should be paid to the depth of central corneal cutting and adjustment of the size of the treated optical area, and the patient should be informed about the situation before surgery.
Strict preoperative examination is the first step to the success of U-vision femtosecond laser treatment for myopia. There are many examination items, and we emphasize that in addition to the above-mentioned routine examination, we also implement some special myopic patients, such as binocular stereopsis function, dominant eye, visual balance, tear secretion, pupil size in dark light and other items that are easily ignored in the routine eye examination, in order to minimize the risk of surgery.
Patients should understand their examination results and communicate fully with their doctors to have a comprehensive understanding of the post-surgical results and to be well informed before receiving treatment.