Understanding Human Colour Vision Through Simulation

Trichromatic Colour Vision

Human colour vision is trichromatic, meaning it relies on three types of photoreceptor cells in the retina called cones. These cones are sensitive to different wavelengths of light: long (L), medium (M), and short (S) wavelength. When these cone cells respond to light, they send signals to the brain, which interprets them as specific colours.

The combination of signals from these three types of cones allows us to perceive a vast range of hues. However, this system can be affected by genetic factors leading to various forms of colour blindness.

Types of Colour Blindness

Colour blindness is often due to the absence or malfunctioning of one or more types of cone cells. The most common types are protanopia, deuteranopia, and tritanopia, which correspond to deficiencies in red, green, and blue sensitivity, respectively. Achromatopsia, a rare condition where all three cones are defective, results in near-total colour blindness.

The severity slider in the simulator allows you to adjust the degree of deficiency, from mild to severe, providing a more accurate representation of how different levels of impairment affect colour perception.

Simulating Colour Vision Deficiencies

The simulation uses real LMS cone-response math to accurately model how light is perceived by the human eye. By applying this mathematical model, it can simulate various forms of colour blindness in a 2D environment, allowing users to compare normal vision with different types of colour deficiency.

This tool not only provides an educational experience but also helps in understanding the challenges faced by individuals with colour vision deficiencies and aids in designing more inclusive visual content.

Real-World Applications

Understanding colour vision through simulation has numerous practical applications. For instance, it can help designers create more accessible color palettes for users with various types of colour blindness. It also aids in the development of tools and technologies that cater to individuals with visual impairments.

Moreover, this knowledge is crucial in fields such as medicine, where accurate diagnosis and treatment of colour vision deficiencies require a deep understanding of how these conditions affect perception.

Frequently asked questions

Try it live

Everything above runs in your browser — open Colour Vision Simulator (2D) and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.