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10 Photopic Vision > 10 Photopic Vision > Flashcards

10 Photopic Vision Flashcards

1
Q

13 . What is Point Spread Function?

A

Distribution of photons during a shutter catch.

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2
Q
  1. What are the basic units of photopic vision?
A

Photons

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3
Q
  1. T/F: The visible light spectrum is narrow.
A

True

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4
Q
  1. What is the approximate range of the visible light spectrum?
A

390 to 700 nm

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5
Q
  1. Most of energy from the sun is in the _____ range.
    A) Infrared
    B) Visible Light
    C) Ultraviolet
A

C) Ultraviolet

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6
Q
  1. When looking at a star how many cones are defining most of the image, and where are they located?
A

3-4 cones.

Center.

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7
Q
  1. What do the bumps in Point Spread Function indicate?
A

Optical aberration

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8
Q
  1. T/F: Cones align towards the nodal point
A

True

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9
Q
  1. What helps to guide the photons to the chromophore?
A

The inner segment guides the photon to the chromophore located in the outer segment.

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10
Q
  1. T/F: Directional sensitivity of cones increases photon catch
A

False, directional sensitivity of cones decreases photon catch.

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11
Q
  1. Out of the 5500 photons entering the eye, how many actually hit the chromophore?
A

~2900 photons

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12
Q
  1. T/F: L/M cone ratio is 2:1.
A

False, L/M cone ratios vary.

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13
Q
  1. The number of photons that reach the photoreceptors has an INVERSE or DIRECT relationship to their frequency?
A

Inverse.

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14
Q
  1. How long is the “shutter time” for cones?
    A) 5 msec
    B) 100 msec
    C) 500 msec
A

B) 100 msec

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15
Q
  1. Photon catch is integrated over a _____ time span.
    A) Long
    B) Short
    C) Medium
A

B) Short

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16
Q
  1. Which photoreceptor (rod or cone) is very sensitive and can respond to a single photon?
A

Rod

17
Q

Which photoreceptor (rod or cone) is very sensitive and can respond to a single photon?

A

Rod.

18
Q
  1. Chromatic aberration can be described as a _______ on the retina.
    A) Blur
    B) Rainbow
    C) Cloud
A

B) Rainbow

19
Q
  1. Low frequency light (reds) focuses BEHIND or IN FRONT OF light?
A

Behind

20
Q
  1. High frequency light (blue) focuses BEHIND or IN FRONT OF light?
A

In front of

21
Q
  1. T/F: L cones are sensitive to short wavelengths?
A

False, L cones are sensitive to Long wavelengths.

22
Q
  1. What is peak sensitivity to a cone?
A

Increased probability of a photon to be absorbed by a cone.

23
Q
  1. T/F: L cones absorb 100% of all photons at different frequencies?
A

False, L cones absorb different frequencies of light at different percentages.

24
Q
  1. At a frequency of 510 Hz, L cones respond to how many photons out of the 2900 that hit the retina?
    a. ) 250
    b. ) 170
    c. ) 310
A

b.) 170

25
Q
  1. What is the complex molecule that contains a chromophore and is found in the outer segment of a cone?
A

Rhodopsin

26
Q
  1. T/F: Rhodopsin is a photon-catching molecule that contains chromophore.
A

False.

27
Q
  1. T/F: Chromophore changes its shape from bent to straight when it absorbs a photon.
A

True

28
Q
  1. Out of every 3 photons, how many end up hitting a chromophore?
A

2 photons

29
Q
  1. T/F: Photoisomerzation is when a photon hits a chromophore isomer and changes it shape.
A

True

30
Q
  1. T/F: If 700 photons cause photoisomerization of chromophore, only a fraction of photons are in the Point Spread Function.
A

True. Only 170 of photons are in point spread function

31
Q
  1. ______ in the vitreous causes chromatic aberration secondary to difference in _______
A

Water, Index of refraction

32
Q
  1. TRUE or FALSE:

Brown circles contain ~25% of the photons
Smaller concentric circles contain ~ 50% of the photons

A

FALSE

Brown circles contain ~50% of the photons
Smaller concentric circles contain ~ 25% of photons

33
Q
  1. How many photons hit each cone?

A) 58
B) 684
C) 1452

A

C) 1452

34
Q
  1. Where is the image carried when the photons hit the cones?
    A) periphery
    B) center
    C) surrounding media
A

B) center

35
Q
  1. Which of the following is out of focus?
    A) L cones
    B) M cones
    C) S cones
A

C) S cones

10 Photopic Vision (1 decks)

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