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Optics II block 5 > Turning Point Qs > Flashcards

Turning Point Qs Flashcards

1
Q

Tear film stability is primarily referring to

A

Evaporation rate

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2
Q

Irregularities in the tear film over a period of time improves the retinal image quality

A

No

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3
Q

If the central corneal thickness (CCT) gets thinner than normal (0.5mm) leads to _____ of IOP

A

Underestimated

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4
Q

Refraction in human eye due to

A

Anterior + posterior+ GRIN lens

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5
Q

Calculate the AA of an eye with a far point of 1m and a near point of 25cm

A

1/1=1D
1/.25m=4D
4-1=3D

3D

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6
Q

Anterior corneal asphericity Q value of human cornea is ______

A

Negative

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7
Q

What should be the Q value required to eliminate corneal spherical aberration

A

-0.528

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8
Q

Radius of curvature along tangential meridian is steeper than RoC along Sagittal meridian,

A

True

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9
Q

Spherical aberration will increase as anterior corneal curvature becomes

A

Steeper

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10
Q

At accommodative state, the refraction of the crystalline lens is

A

31.85D

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11
Q

Crystalline lens axial thickness increases all through life at a rate of _____ per year

A

13 microns

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12
Q

The line connecting the foveola and the fixation point passing through the nodal points is

A

Visual axis

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13
Q

The line connecting the foveola and the fixation point passing though the nodal point is

A

Line of sight

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14
Q

The position at which the line of sight intercepts the cornea is called

A

Corneal sighting center

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15
Q

Angle between the pupillary axis and LoS is _______

A

Angle lambda

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16
Q

Scholars use ________ model eye to store and retrieve knowledge

A

Both utilitarian tool and encyclopedia

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17
Q

Who was the first to realize the existence of the inverted retinal image, and understood how to correct refractive errors

A

Kepler

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18
Q

Scheiner invented the first ever optometer to measure the _____________ in the human eye

A

Refractive error

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19
Q

What is the optical power of the tear film

A

48D

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20
Q

Tear film is composed of three layers, name the top most layer

A

Oily

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21
Q

Tear film stability is primarily referring to

A

Evaporation rate

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22
Q

Irregularities in the tear film over a period of time improves the retinal image quality

A

False

23
Q

Dry eye patients generate higher order aberrations like spherical aberration and _______ about 2.5 times more than the healthy eyes

A

Coma

24
Q

Cornea has ______ of the total power of the eye

A

2/3

25
Q

Anterior corneal asphericity Q value of human cornea is _____

A

Negative

26
Q

What should be the Q value required to eliminate corneal spherical aberration

A

-0.528

27
Q

Spherical aberration will increase as anterior corneal curvature becomes

A

Steeper

28
Q

If the central corneal thickness gets thicker than normal (0.5mm) leads to _______ of IOP

A

Overestimation

29
Q

Which part of the GRIN crystalline lens of the human eye has the lowest refractive index

A

EQUATOR

30
Q

Refraction in human eye due to

A

Anterior + posterior + GRIN lens

31
Q

At accommodative state, the refraction of the crystalline lens is

A

31.85D

32
Q

Calculate the AA of an eye with a far point of 1m and a near point of 25cm

A

3D

33
Q

In a trifocals IOL, the potential intermediate vision helps you to ______ better

A

Watch TV

34
Q

Extended range of vision IOLs claims to provide good continuous vision and reduce ______

A

Glare and halo

35
Q

What is the job description of the Iris

A
  • Stop undesirable light
  • Regulates retinal illuminations
  • controls DoF
  • controls retinal blur
  • help design optical systems
36
Q

Exit pupil is the image of the aperture stop formed on the image space

A

True

37
Q

Entrance pupil is an erect, _______ image formed in front of the actual pupil

A

Virtual

38
Q

DoF for the human eye is between 0.5 and ____D

A

1D

39
Q

The line connecting the foveola and the fixation point passing through the nodal points is

A

Visual axis

40
Q

The position wt which the keratometric axis intercepts the cornea is called

A

Vertex normal

41
Q

Angle between the pupillary axis and LoS is

A

Angle lambda

42
Q

What is the disadvantage of using working model (toy train) for solving problems of vision science

A

Oversimplified

43
Q

Who was the first to develop a average schematic model eye

A

Young

44
Q

Applying the simplification of hte model eye concept, how many surfaces does the Bennett rabbetts model have

A

3

45
Q

Which of the 4 purkinji images forms image real and inverted

A

Purkinji IV

46
Q

Some corneal typographers and keratometric work based on the principle of

A

Purkinji I

47
Q

Consider the light source is at infinity ad a femal anterior cornea RoC is 7.93mm. Determine the location of the purkinji image I by treating anterior corneal surface as a mirror

A

3.965

48
Q

How can we best express the separation of two stars

A

Arcsec

49
Q

In a corrected eye, what causes blur

A

Diffraction and aberrations

50
Q

A more confined PSF is achieved with

A

A larger pupil

51
Q

Which of the following is a diffraction limited PSF

A

Pointy one

52
Q

Better vision is achieved with

A

A more confined PSF

53
Q

Which of the following can be parameterized

A

Wavelength and diameter of pupil

Optics II block 5 (11 decks)

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