Chapter 4 pt. 1 Flashcards
Vision is basically your eyes absorbing _____
light
The danger of radiation is dependent of its __________
properties
True or False: not all radiation is dangerous
True
Light is ___________ radiation, it travels in waves.
electromagnetic
Light is electromagnetic radiation, it travels in ______.
waves
Amplitude or Wavelength: the height of a light wave
amplitude
Amplitude or Wavelength: the brightness of light
amplitude
Amplitude or Wavelength: distance between peaks in light
wavelength
Amplitude or Wavelength: Hue the color of the light
wavelength
True or False: when it comes to light, the longer the wavelength the more dangerous it is
False, the shorter the wavelength the more dangerous it is
True or False: the shorter the wavelength the more dangerous it is
True
different wavelengths added together
purity
The eye houses the _____ and channels light toward it
retina
How does light enter the eye?
- light enters your eye then…
- …to lens: focuses the light on the retina (back of the eye)…
- …past the ciliary muscles…
- …axons bundle together to form optic nerve, which goes to the brain…
ring of muscle in the eye
iris
______ size regulates the amount of light
pupil
pupil size regulates the amount of ______
light
the back of your eye that has cones
fovea
How does nearsightedness occur?
- the focus of light from distant objects falls a little short of the retina
- the eye is elongated, like an oval, so the image does not quite reach the retina (naturally)
How does farsightedness occur?
- The focus of light from close objects falls behind the retina.
- eye is like a squished circle
the retina contains two types of receptors, _____ and ______
rods
cones
Rods or cones: night vision (sensitive dim light)
rods
Rods or cones: faster dark adaptation
rods
Rods or cones: daylight vision and color vision (provide sharpness and detail in bright light)
cones
Rods or cones: focused in fovea
cones
Does your eye have more rods or cones?
rods
How do visuals travel through the brain?
- Retina
- Optic Chiasm
- Lateral geniculate nucleus (LGN)
- Superior colliculus
- Visual Cortex
Explain the Trichromatic Theory.
We perceive color by comparing the responses of three types of cones,
- each of which is sensitive to a different part of the range of visible wavelengths (e.g. short, medium, or long)
Why does color blindness occur?
Usually only one or two types of color receptors are faulty – most commonly red & green
Many people with color blindness still see what colors?
blue and yellow
How does the Trichromatic help explain color blindness?
Since color blindness has to do with faulty color receptors, trichromatic theory suggests each cone has a different set of sensitivity.
Suggesting color blindness has to do with either too much or too little visible wavelengths. Or the fault may be due to sensitivity.
