Topography Maps | 合法醫療器材資訊網

Onthebottomrightatopographicmapcanbeselectedtoviewthedistributionofrefractivepowerovertheentirecornea.Thehistogramonthebottomleftshows ...

A sphere has the same radius of curvature at every position, but due to spherical aberration the refractive power is not the same everywhere. When radii are directly converted into power values, according to the laws of Gaussian optics, the refractive effect is not taken into account. In a topography map, calculated without considering the refractive effect, a sphere with a radius of, e.g., 8 mm will show the same power of 42.2 D at every point of its surface.