The human eye contains approximately 120 million rods.
These rods, along with cones, are photoreceptor cells located in the retina, responsible for converting light into electrical signals that the brain interprets as vision.
Rods vs. Cones
| Feature | Rods | Cones |
|---|---|---|
| Number | ~120 million | ~6 million |
| Light Sensitivity | High; function in low light | Low; require more light |
| Color Vision | No; black and white vision | Yes; responsible for color vision |
| Types | One | Three (red, green, blue) |
| Location | Primarily in the periphery of retina | Primarily in the fovea (center) of retina |
As illustrated in the table, rods are more sensitive to light than cones, allowing us to see in dim conditions. According to the reference, cone cells come in three types, allowing us to see color: red-sensing (60%), green-sensing (30%) and blue.
