Clinical Implications Of CS Flashcards
When a lens is forming an image of a sine wave grating, the partial frequency of the image depends on the ________ of the lens
Mag of lens
Two characteristics of sine was grating are ______ and _____
Frequency and contrast
Which of the following sine wave grating has high spatial freq
One with a tiny spacing between lines
What characteristics or information does these two plots show (different amps)
Contrast
When a lens is forming an Aimee of a sine wave grating, the contrast or modulation depth of the image depends on the ____ of the lens
Quality of the lens
For a real lens as the spatial frequency of the object increases the amp of the modulation of the image distribution __________
Decreases
Defocus reduces IQ at which Frequency?
High spatial frequency
What is the reciprocal of contrast threshold of a grating
Contrast sensitivity
What is the max contrast sensitivity function of the human eye
4
What is the cut off freq of the eye
60
Which of the following is not an optotype that is tested routinely
Low contrast
Names a reason why the visual system show reduction in sensitivity for high spatial freq
- photoreceptors packing density
- aberrations
A lower spatial freq, where the bright bar of a grating falls on both the receptiofe fields center and the surround, thereby causing later inhibition, results in a smaller response leading to ________
Low SF cut off
If the bright bar of a sine wave grating has a luminance of 90 foot lamberts, and the dark bar has a luminance of 30 foot lamberts, the grating contrast is
0.50
All of the sine wave grating listed below have equally low contrast. Which frequency is most visible
10 cyc/deg
