Assessment of topography and a half Meri Gien parameters for and for vector planning treatment corneal astigmatism analysis

摘要

By considering the topography of the image reflected from the illuminated number of concentric rings of the cornea, a technique for determining the topography parameters for each hemi-division of the eye is disclosed. The fit snugly in each ring, generates a simulated ball cylinder matching the topography of each ring, from the simulated sphere cylinder, it is possible to obtain a topographic parameters for each ring. All topography parameters of the respective rings are combined to obtain a summation average value representative of the magnitude and meridian of each hemi division. From these parameters, a single topography value for the entire eye (CorT), and I can find a value that represents the topography difference between the two hemi-divisions (TD). The topography values ​​for hemi division is used in the vector planning system in order to obtain the treatment parameters in a single step operation.