Figure 2.

(A) Geometry of light scattering by a cylinder. The light scattered by a cylinder is confined to a conical sheet coaxial with the cylinder axis. The apex angle of the cone is twice the angle between the cylinder axis and the incident ray. The incident angle (θ) of a bundle is defined as the angle between the incident ray and a plane perpendicular to the bundle; the scattering angle (φ) is defined as the angle between incident and scattering planes, where the incident plane contains the incident ray and the bundle and the scattering plane contains the reflected ray and the bundle. Values for θ and φ of a bundle are calculated from the positions of the light source and camera and the bundle orientation and position in the retina. (B) Illustration of the angular spread function (ASF) of the RFNL reflectance. Circles are the measured ASF of a normal nerve fiber bundle (500 nm). The thick curve is the fitted ASF (Equation 2), which is the convolution of the angular response function of the instrument (thin curve) and a symmetric decaying exponential.