# Insight, The Journal of ASORN ASORN Insight 2018 Q3 - Page 14

12 CLINICAL CONUNDRUM Equation of the Vision in Colors Continued from page 11 stimuli together are interpreted in the brain as just one color. When the three types of cones are stimulated equally, this pro- duces the sensation of white light. When stimulated together, but with different intensities, the sensation of all colors may occur (Deeb & Kohl, 2003). Deepening Our Understanding of Color Perception Because color is a sensation, it will always be difficult to con- struct explanatory models. Based on physical and biological data, we are studying an equation that explains the interpreta- tion of colors, which would vary not only with the stimulus of the environment, but also with intrinsic factors of the observer (such as number of cones, nerve connections, and others fac- tors). Each axis of this graph would have a vector force exerted by the number of cones (A, B, C) the person possesses and by the degree of stimuli received from the environment (a, b, c), resulting in a color interpreted by the brain (X). Thus, we have an equation for how the brain interprets colors: X = a.A + b.B + c.C (see Figure 1). All force is a vector quantity that has a value and a direction. The number of cones and the environment stimuli are variables to this vector force. In the human eye, the same environmental stimulus (a, b, c) applied to the cones and their nerve connections (A, B, C) can produce different vector intensities in the three-dimensional light spectrum. The same stimuli can produce the sensation of color X in one person, and in another, the sensation of color Y. Some color blind people lack certain cones and connections (A, B, or C), but they still have one or two vector forces when Figure 2. Filter strip photo, which different people perceive as having different col- ors, and graphical representation of the three groups of people in relation to the “zone of chromatic confusion.” walking through a three-dimensional spectrum of colors. Although they do not see the same colors as other people, with different external stimuli (a, b, c) they end up having a spectra of different colors and consequently are able to differentiate between two objects of different colors. We can test the equation using a photo taken with a filter, which causes different people to observe distinct colors due to different numbers of cones and nerve connections (A, B, C) (see Figure 2). One group of people observing this picture describe the colors as white and gold; a second group, as blue and black; and a third group, as white and gold at certain times of the day and blue and black at other times of the day. We noticed that it was the photo of the dress (taken with a fil- Figure 1. Graphical representation of the color equation. ASORN INSIGHT Summer 2018 ter) that caused the discordance in the colors, and not the dress