History of Human Vision Flashcards
X-rays were initially discovered due to their ability to cause…
Fluorescence
Who is given credit with inventing the fluoroscope?
Thomas Edison
What did first generation fluoroscopes consist of?
Tube, Table, Screen
The time it takes for the human eye to adjust to low light levels is called…
Adaption time
The types of receptors which are densely concentrated in the posterior portion of the eye are the…
Cones
Daylight vision is also known as ____ vision.
Photopic
The receptors in the eye which are most sensitive to blue green light, and which are highly sensitive to low levels of illumination are the…
Rods
Night vision is also known as…
Scotopic
The cones, which are sparsely scattered over the curvature of the retina are used for ___ vision during daylight.
Peripheral
In what month and year were x-rays discovered?
Nov 1895
What part of the eye is capable of perceiving color?
Cones
Prior to the development of the Image Intensifier, in order to enhance the brightness of the image during fluoroscopy, what steps had to be taken?
Increase the technique
The first incidence of fluoroscopy was noted by…
Roentgen
Rods are ______ to low levels of light.
Sensitive
In the early days of fluoroscopy, what was used to view the fluoroscopic images emanating from the screen?
The rods in the periphery of the retina
What conversion occurs in the image at the output phosphor of an image intensifier tube?
Electrons are converted to light
What conversion occurs in the image at the input phosphor of an image intensifier tube?
X-rays to light
What conversion occurs in the image at the photocathode of an image intensifier tube?
Light to electrons
The input phosphor of modern image intensifiers is made of…
Cesium Iodide
How is the appearance of “ghost images” on the monitor during fluoroscopy prevented?
Curving the tube of IP and PC
Output phosphor:
Electrons to light
Anode:
Aids in speeding up electrons
Input Phosphor:
X-rays to light
Photocathode:
Light to electrons
