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Change in corneal topography and morphometry after correction of myopia by SMILE method

Poster Details

First Author: I.Dutchin RUSSIA

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Abstract Details


To practice the Smile method for myopia correction becomes more and more popular, both among refractive surgeons and among potential clients of this technology. In our clinic, the number of such interventions is constantly increasing and it seemed interesting for us to study the change in the topography of the cornea and its thickness after correction of medium degree myopia.The purpose �â�€�“ to study the features of the anatomical-topographic parameters of the cornea after the operation by the 'Smile' method on a Visumax femtolaser system using standard technology.


The research was performed in the State Institution Eye Microsurgery Complex named after academician S.N. Fyodorov, Khabarovsk, Russia


The study analyzed data from 40 eyes (20 patients) with stabilized myopia from -2.0D to -6.0D. 12 women and 8 men. Mean age was 34�Â�±4.7 years. During operation, thickness of cornea surface layer was set at 130 �Î�¼m. Thickness of lenticle in center was from 30 to 115 �Î�¼m, on average 87.6�Â�±0.24 �Î�¼m, its diameter was equal to 6.7 mm. The width of surface section was 2.8 mm.In all 40 eyes before and after surgery, in addition to standard refractive examination, thickness of cornea was measured on RTVue-100 XR (USA) tomography, corneal topography was examined on TOMEY4 keratotopography.


Clinical and functional results in the postoperative period showed high effectiveness of this technology. High visual acuity of 0.6 and above was obtained in all cases (100%). The postoperative refraction was within �Â�±0.5D from the planned. On the next day after operation a uniform flattening of the surface from the center to the periphery over the entire area of the cornea was observed according to the topography. Keratorefractive parameters of the cornea in the center (Power Difference map) in all cases changed by the value of the planned refractive effect.


The thickness of the cornea decreased most in the center, however, we noted that there is a deviation of the actual postoperative parameters from the planned corneal parameters, which averaged 12.6 �Î�¼m. Outside the area of exposure, the thickness of the cornea remained in the same parameters.Topography of the cornea shows a uniform flattening of the surface from the center to the periphery along its entire area.It is undoubtedly important to further monitor the dynamics of the stability of refractive results, as well as further study of keratorefractive parameters of the cornea.

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