To understand how a RED LIGHT RETINA DRAW (RLRD) works, it's best to start at the beginning -- with a beam of red light -- and end on the retina.
- Step one: A red light source such as a LED, laser emits a beam of red light, not too intense.
- Step two: Depending on whether the light source is a laser or LED, the light beam will pass through a system of lenses: Condenser lens, Fresnel lens...The purpose is to focus the light beam on the LCD.
- Step three: The beams of red light pass through a liquid crystal display composed of thousands of tiny pixels. When the red light passes through the LCD screen, they relay on only the red version of the outside scene.
- Step four: The light beam will pass through a convex lens.
- Step five: The light of this red version of the scene then passes through a wide angle lens and onto the retina.
