Turning Point Qs

Question 1

Tear film stability is primarily referring to

Answer 1

Evaporation rate

Question 2

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

Answer 2

No

Question 3

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

Answer 3

Underestimated

Question 4

Refraction in human eye due to

Answer 4

Anterior + posterior+ GRIN lens

Question 5

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

Answer 5

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

3D

Question 6

Anterior corneal asphericity Q value of human cornea is ______

Answer 6

Negative

Question 7

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

Answer 7

-0.528

Question 8

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

Answer 8

True

Question 9

Spherical aberration will increase as anterior corneal curvature becomes

Answer 9

Steeper

Question 10

At accommodative state, the refraction of the crystalline lens is

Answer 10

31.85D

Question 11

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

Answer 11

13 microns

Question 12

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

Answer 12

Visual axis

Question 13

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

Answer 13

Line of sight

Question 14

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

Answer 14

Corneal sighting center

Question 15

Angle between the pupillary axis and LoS is _______

Answer 15

Angle lambda

Question 16

Scholars use ________ model eye to store and retrieve knowledge

Answer 16

Both utilitarian tool and encyclopedia

Question 17

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

Answer 17

Kepler

Question 18

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

Answer 18

Refractive error

Question 19

What is the optical power of the tear film

Answer 19

48D

Question 20

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

Answer 20

Oily

Question 21

Tear film stability is primarily referring to

Answer 21

Evaporation rate

Question 22

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

Answer 22

False

Question 23

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

Answer 23

Coma

Question 24

Cornea has ______ of the total power of the eye

Answer 24

2/3

Question 25

Anterior corneal asphericity Q value of human cornea is _____

Answer 25

Negative

Question 26

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

Answer 26

-0.528

Question 27

Spherical aberration will increase as anterior corneal curvature becomes

Answer 27

Steeper

Question 28

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

Answer 28

Overestimation

Question 29

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

Answer 29

EQUATOR

Question 30

Refraction in human eye due to

Answer 30

Anterior + posterior + GRIN lens

Question 31

At accommodative state, the refraction of the crystalline lens is

Answer 31

31.85D

Question 32

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

Answer 32

3D

Question 33

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

Answer 33

Watch TV

Question 34

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

Answer 34

Glare and halo

Question 35

What is the job description of the Iris

Answer 35

- Stop undesirable light - Regulates retinal illuminations - controls DoF - controls retinal blur - help design optical systems

Question 36

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

Answer 36

True

Question 37

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

Answer 37

Virtual

Question 38

DoF for the human eye is between 0.5 and ____D

Answer 38

1D

Question 39

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

Answer 39

Visual axis

Question 40

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

Answer 40

Vertex normal

Question 41

Angle between the pupillary axis and LoS is

Answer 41

Angle lambda

Question 42

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

Answer 42

Oversimplified

Question 43

Who was the first to develop a average schematic model eye

Answer 43

Young

Question 44

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

Answer 44

3

Question 45

Which of the 4 purkinji images forms image real and inverted

Answer 45

Purkinji IV

Question 46

Some corneal typographers and keratometric work based on the principle of

Answer 46

Purkinji I

Question 47

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

Answer 47

3.965

Question 48

How can we best express the separation of two stars

Answer 48

Arcsec

Question 49

In a corrected eye, what causes blur

Answer 49

Diffraction and aberrations

Question 50

A more confined PSF is achieved with

Answer 50

A larger pupil

Question 51

Which of the following is a diffraction limited PSF

Answer 51

Pointy one

Question 52

Better vision is achieved with

Answer 52

A more confined PSF

Question 53

Which of the following can be parameterized

Answer 53

Wavelength and diameter of pupil