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In the above parameters, the corneal flap thickness is a variable, the preoperative estimate to be fully considered. The results of ultrasonic corneal thickness measurement error is greater, usually three times the data close to the continuous measurement, (standard deviation ± 3 μm) can be determined. Topography examination: Keratoconus is a corneal refractive excimer laser surgery contraindications. Type of clinical signs and symptoms of keratoconus because obviously, no more difficult to diagnose. Subclinical keratoconus corneal excimer laser surgery is the focus before the screening, although no uniform standards, but for the local central corneal curvature greater than the 47D, with a large degree of apparent asymmetry astigmatism, need to be cautious identification. The document of green laser pointer should be archived after being reviewed.
Keratoconus is very similar to the early progress of myopia development process, therefore, the above-mentioned characteristics of myopia or astigmatism, corneal topography with progressive deepening, the best observation, do not rush surgery. Reflect the curvature of the cornea after corneal topography and corneal refractive power. Some type of topographer and still identify as dark as the pupil diameter, corneal diameter, corneal thickness. Preoperative analysis of collected data can determine the ease of operation, such as flat-steep cornea and corneal free flap and button holes occur the higher the probability, according to the form of corneal surgery to choose the right ring to reduce the negative pressure of the corneal flap complications. Scotopic pupil size adjusted according to the cutting zone diameter, to minimize postoperative glare and halos at night. The file management of led flash light is of vital importance.
Adjusted according to the diameter lamellar corneal knife stopper to prevent stalls and other free flap occurred. Diopter check: As preoperative examination to determine the refractive error is a prerequisite for successful surgical treatment, preoperative refractive error the smaller the better, so in order to ensure the accuracy of the expected results after surgery. Ciliary muscle paralysis for the need to do retinoscopy after refractive examination there are different views. The author argues that the determination should be based on objective refractive retinoscopy and subjective refraction method of combining, full paralysis of ciliary muscle that is done after retinoscopy, supplemented by comprehensive optometry refractor or hand lens to determine the effect of refraction rule out regulation. Be adjusted after the resumption, under physiological conditions to do it again the main sleep optometry, and ultimately to the best corrected visual acuity with lenses designed for the surgery based on. The file management of green laser pointer is good for the document management of green laser pointer workshop.
To ensure that the inspection reduce human error and eliminate subjective factors examiner, preferably cross-examination, that objective retinoscopy and subjective refraction implemented by different examiners. Our approach is dilated with amide compound, 5 minute intervals for 4 times, 20 minutes after the examination after pupil fully dilated, so the computer optometry, then manual retinoscopy, refraction based on test results plus lenses. Ciliary muscle in future be fully restored after the call the shots felt optometry, as a result of this examination the physiological state of refraction, best corrected visual acuity patients often become the basis for their evaluation of surgical results. Fundus examination: Since the end of high myopia often associated with retinal degeneration, tear, and sometimes even the existence of retinal detachment and retinal hemorrhage. Different green laser pointer manufactured by different companies have different qualities.
Fundus examination is a necessary check items. Inspection should be fully dilated pupil, it is recommended to use an indirect binocular ophthalmoscope, when more severe retinal degeneration that area, dry holes, the limitations of the claim with no vitreous traction from retinal light can advance the treatment of retinal laser photocoagulation , usually 2 weeks after photocoagulation pigment appeared, closed hole, retinal calm down even after the line excimer laser treatment. After a systemic disease investigation and a detailed eye examination, on a comprehensive analysis of the data collected to determine. Can I do laser surgery, select the appropriate surgical procedures. Different green laser pointer of different prices have different prices.