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.
Average and equivalent refractive indices for the crystalline lens as a function of age, as deduced using eye models based on Atchison [19]. The central and surface indices of the lens are assumed to remain constant at 1.415 and 1.37 respectively. See text for details.
