Vision

Question 1

Identification of misalignment between 2 lines or gratings is called

Answer 1

Vernier acuity

Question 2

Neonatal VA is approx

Answer 2

<6.60

Question 3

Neural pathways to the visual cortex continue to develop to age ?

Answer 3

8

Question 4

What is the definition of angle alpha

Answer 4

angle between optical and visual axes
describes the offset of the eye relative to the optical axis

Question 5

How mant degrees horizontally is angle alpha

Answer 5

5.2

Question 6

What is definiton of angle kappa

Answer 6

angle between the pupillary axis and visual axis

Question 7

How is angle kappa measure

Answer 7

angle between centre of the pupil and the light reflex

Question 8

How much is angle kappa horizontally

Answer 8

2.6 degrees

Question 9

If you had to draw the visual axis what would it be

Answer 9

line to the fovea

Question 10

If you had to draw the pupillary axis what would it be

Answer 10

line through centre of pupil

Question 11

If you had to draw the optical axis what would it be

Answer 11

line through geometric centre of lens

Question 12

density of cone receptors is highest where in the retina

Answer 12

fovea

Question 13

what is the formular for snellen VA

Answer 13

1/min angle of resoluton

Question 14

the whole letter on snellen chart subtends __ arcminutes

Answer 14

5

Question 15

the gap in C or E on snellen chart subtends _ arcminutes

Answer 15

1

Question 16

HOw many letters per line in logMAR

Answer 16

5

Question 17

How many m away for logMAR chart

Answer 17

4m

Question 18

what phenomenon is reduced in logMAR

Answer 18

crowding

Question 19

Which 3 VA testings can be used in children

Answer 19

Teller Keeler Cardiff

Question 20

What VA testing for 2+

Answer 20

Kay picture cared

Question 21

Which 3 VA testing used for 3+

Answer 21

Sheridan Gardiner, Sonksn Silber, KeelerlogMAR

Question 22

What can be used for objective measure of VA

Answer 22

Visual evoked potentials

Question 23

What type of VEP used for infants/uncooperative patients

Answer 23

flash VEP

Question 24

What do Pelli Robson and Vistech wall charts measure

Answer 24

contrast sensitivity

Question 25

Fovea has poor sensitivity for which colour light

Answer 25

blue light

Question 26

How many Hz is optimum flicker

Answer 26

10Hz

Question 27

Dark adaptation takes how long

Answer 27

20 mins

Question 28

Following dark adaptation, which is more sensitiy, rods or cones

Answer 28

rods

Question 29

What phenomemen can happen in unilateral optic neuritis where there is an illusion of abnormal motion

Answer 29

Pulfirch phenomenon

Question 30

What is the total amount of light emitted called

Answer 30

luminous flux

Question 31

Luminous flux is measured in

Answer 31

lumens

Question 32

Amount of light per solid anlge is called

Answer 32

Luminous intensity

Question 33

Luminous intesnity is measure in

Answer 33

candelas

Question 34

Illumination/illuminace is described as

Answer 34

amount of light arriving at a surface

Question 35

Illumination/illuminance is meausre in

Answer 35

lux

Question 36

What is the formular for luminance

Answer 36

light emitted/light reflected from surface

Question 37

What is luminance measured in

Answer 37

lamberts

Question 38

S wave cones sensitivity to what colour and wavelength

Answer 38

blue - 445

Question 39

M wave cones sensitivity to what colour and wavelength

Answer 39

green 545

Question 40

L wave cones sensitivity to what colour and wavelength

Answer 40

red 570

Question 41

peak sensitivity for rod cones

Answer 41

500nm

Question 42

red green colour defect are from which chromosome abnormality

Answer 42

X

Question 43

in dark adapted conditions which wavelength has peak luminosity

Answer 43

blue green 500nm

Question 44

in photopic conditions which wavelength has peak luminosity

Answer 44

yellow green 555nm

Question 45

Ishihara detects what colour vision defect

Answer 45

red/green

Question 46

What is the most comprehensive colour vision test

Answer 46

Farnswork Munsell 100 hue test

Question 47

What is the colour test designed for children

Answer 47

Lanthony New Colour test

Question 48

macular disorder give rise to what colour vision defects

Answer 48

blue yello

Question 49

optic neuropathies give rise to what colour vision defects

Answer 49

red green

Question 50

Name 3 tests for steropsis

Answer 50

Frisby, Lang, TNO