Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Representation of the elevation map of a corneal surface modeled as a biconic. The flatter and steeper meridians have apical radii of r1 and r2 (r1>r2) and asphericity of Q1 and Q2, respectively. The color scale has a 5 micron steps. This scale is used for the Figures R5 and R6.
