The Human Eye -- Rods and Cones.
Michigan Swampbuck has a thread on ATS that goes into the relationship of the shadow people and the rods and cones of the eye. -- Have a read.
Here it is:
From Out of the Corner of Your Eye.
So a recap here. There are two types of photo receptor cells in the eye; rods and cones. These are located on the retina and are akin to the idea of film in a camera. These transmit signals to the brain, which interprets what the eyes see.
Quote:Google AI overview:
Rods and cones are photoreceptor cells in the retina responsible for vision. They differ in function, location, and number:
Rods:
- Primarily responsible for vision in low light conditions (scotopic vision)
- Highly sensitive to light, enabling the detection of even single photons.
- Do not mediate colour vision and have low spatial acuity.
- Located in the periphery of the retina.
- Approximately 91-120 million rods are present in the human eye.
Cones:
- Function in higher light levels (photopic vision) and enable colour vision.
- Responsible for high spatial acuity and the perception of fine details.
- Concentrated in the fovea, the central part of the retina.
- Three types of cones exist, each sensitive to different wavelengths of light (red, green, and blue).
- Around 4.5-6 million cones are present in the human eye.
Distribution:
- Rods are more numerous than cones throughout most of the retina.
- Cones are primarily located in the central fovea.
Function:
- Rods are crucial for night vision and peripheral vision.
- Cones are essential for daylight vision, colour perception, and sharp, detailed vision.
So we can see that cones are colour receptors that work in bright light, and the rods are for night and peripheral vision. The other important point is the cones are more plentiful near the centre of the retina, and rods are more plentiful further away.
So it is not the cones and daylight colour vision we are interested in. What we are interested in is the rods that are responsible for night and peripheral vision. To see the shadow people, we don't need colour vision. We only need the rods.
Now, the distribution of the rods and cones is important. This is because it explains why we see things out of the corner of the eye, and why they disappear when we look straight at them.
Above. Diagram showing distribution of the rods and cones of the eye.
Above. Microscopic photograph showing the difference in distribution of rods and cones. Left. The fovea of the eye, where cones are concentrated. On the right is the peripheral vision, where rods out number cones. Fovea, by the way, is the medical name for the focus point in the back of the eye.
This brings us to the blind spot.
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(note: Images used are widely distributed on the net and cannot be accurately credited.)
