Vertex distance the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to the ey...
Found on
http://en.wikipedia.org/wiki/Vertex_distance
The distance (in mm) from the apex of the cornea, to the posterior surface of the spectacle lens or trial lens.
Found on
http://eyediologyopticians.co.uk/pages/Eye-terms-explained.html
No exact match found.
