Figure 2

Schematic sketch of the reference angles and axes in the human eye. The axes are indicated by the following lines; solid black (line of sight), solid blue (pupillary axis), dashed green (visual axis), dashed red (optical axis), and dashed black (videokeratoscope axis). The centers of curvature of each refracting surface are represented as L2, C2, C1, and L1. (Reprinted from Biomedical Optics Express, Vol. 3, Issue 2, Nowakowski M, Sheehan M, Neal D, Goncharov AV, Investigation of the isoplanatic patch and wavefront aberration along the pupillary axis compared to the line of sight in the eyem, Pages 240–258, Copyright © 2012 The Optical Society All Rights Reserved, published with permission of The Optical Society.).