Class 2 Flashcards
How does light enter our eyes
Entering through the cornea, at the front. Due to the curved shape, the image is reflected upside down to the back of our eyes, hitting the retina
What is the back of the retina composed of?
Rods and cones
Difference between rods and cones
Rods are 1000x more sensitive to light than cones, mainly used for night vision
Cones are much weaker and need high intensity of light to function.
Which Colors do our eyes respond to?
Blue, green and red
What is day time
Vision also called?
Photopic vision
What can have a positive psychological effect on humans due to light
- The circadian rhythm
- Blue light
- Yellow light
- Seasonal affective disorder (SAD)
What is the circadian rhythm?
Our bodies natural hormonal cycle that manages our sleep and our awakening
When there is light our body gets energized and pushes us to wake up and when there is a lack of it, the body pushes to sleep.
Types of light, ids duration and time of day and its strength also has an affect
What is blue light?
Also referred to as morning light
The wavelength at this point of day, with clear blue sky, is exactly 470 nm
This wavelength is the one that wakes us up the most effectively and gives us a boost of energy during the day.
Our skin absorbs it
This color is not registered and sent to our brain, it activates the secretion of hormones from the brain
What does 470 nm of light do?
Improves our memory, reaction time, learning abilities and awareness
What is yellow light?
Also known as evening light, has the opposite effect of blue light.
It calms us and prepares us to go to bed
Was is seasonal affective disorder
The SAD happens when the lack of light, like our winters, gradually lowers our energy, bringing us into a depression.
How do we see color?
Effect of light waves bouncing off or passing through various objects
What are 2 elements to determine the color of an object?
The characteristics of the light source
The way the object absorbs, transmits or reflects the light striking it
What is real color?
The color of the object under natural light or white light conditions
What affects our perception?
The wavelength emitted by light source
The wavelength reflected by object
The environment in which we see objects
The characteristics of the visual system
Which Colors do we detect the brightest and the darkest
Yellow-green waves as brightest and red and blue waves as darker
What are primary Colors of light
Red, green and blue
What are secondary colors of light
Magenta (red+blue)
Cyan (green + blue)
Yellow (red+green)
What are Colors of light called
Additive
What are primary Colors of pigments
Magenta (red+blue)
Cyan (green+blue)
Yellow(red+green)
What are secondary colors of pigments
Red
Green
Blue
What are Colors of pigments called?
Subtractive
