Figure 3
From: Monte Carlo simulation of laser beams interaction with the human eye using Geant4

Incidence of beam on the retina. (a) Observation of an incident beam with 200 optical photons (green), in G4UI (OpenGL graphics); (b) Schematic diagram of the five incidence positions of beam on the retina (*representation of a spherical druse with a radius of 50 μm); (c) Position Y of the incidence points observed in a); (d) Histogram in Y of the beam incident on the retina, with a diameter around 50 μm (100 million simulated photons).