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PHYSIOLOGICAL OPTICS (RNH) > (5) RETINA > Flashcards

(5) RETINA Flashcards

1
Q

RODS & CONES

NUMBER

A

RODS 120 MILLION

CONES 6 MILLION

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2
Q

RODS & CONES

LOCATION

A

RODS peripheral retina

CONES central retina

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3
Q

RODS & CONES

SENSITIVITY (greater/lesser)

A

RODS greater

CONES lesser

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4
Q

RODS & CONES

THRESHOLD (greater/lesser)

A

RODS lesser

CONES greater

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5
Q

RODS & CONES

RETINAL PIGMENT

A

RODS Rhodopsin

CONES Iodopsin

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6
Q

RODS & CONES

FORM SENSE (Acute/poor)

A

RODS poor form sense

CONES acute form sense

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7
Q

it can present form of an object

  • rods
  • cones
A
  • cones
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8
Q

it can present contour of an object

  • rods
  • cones
A
  • rods
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9
Q

RODS & CONES

DESCRIPTION
- primitive and crude

A

RODS

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10
Q

RODS & CONES

DESCRIPTION
- one vision refined

A

CONES

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11
Q

VISIBLE SPECTRUM

can appreciate white light (from longer wavelength upto shorter wavelength)

  • rods
  • cones
A

cones

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12
Q

VISIBLE SPECTRUM
- appreciate short white light

  • rods
  • cones
A

rods

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13
Q

WAVELENGTH
- sensitive to all

  • RODS
  • CONES
A

CONES

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14
Q

WAVELENGTH
- sees no red

  • RODS
  • CONES
A

RODS

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15
Q

COLOR SENSE

  • achromatic
  • RODS
  • CONES
A

RODS

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16
Q

COLOR SENSE
- achromatic

  • RODS
  • CONES
A

CONES

17
Q

SUMMATION

  • no
  • RODS
  • CONES
A

CONES

18
Q

SUMMATION

  • with
  • RODS
  • CONES
A

RODS

19
Q

PARTS OF THE CELL

A

cell body contain nucleus

cell processes

20
Q

the pigment migrates into processes and may almost reach the external limiting membrane

  • photopic vision
  • scotopic vision
A

scotopic vision

21
Q

RODS: its withdrawal to the dark position required from

  • 1-2 hrs
  • 2-3 hrs
A
  • 1-2 hrs
22
Q

3 parts of cone cells

A
  1. cone body
  2. thicker process
  3. slender process
23
Q

3 parts of thicker process

A
  • cone-rod, a short outer membrane
  • inner membrane
  • cone myoid
24
Q

staining property of the retina varies with exposure to light

A

chemical

25
Q

the exposure to light causes the retina to become _____ in reaction

A

acid

26
Q

the layer of the rods and cones become ______ charge when expose to light

  • positive
  • negative
A

positive

27
Q

it is the signal that travels along the nerve fiber

A

nerve impulse

PHYSIOLOGICAL OPTICS (RNH) (16 decks)

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