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Clinical Refraction (Laboratory) > Trial lens Set > Flashcards

Trial lens Set Flashcards

1
Q

A tool used by optos to determine a patients eye refraction either in the form of eyeglasses or contact lenses

A

Trial box
Trial case
Trial lens

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2
Q

It measure/check refractive error

A

Trial lens

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3
Q

Objective refraction

A

No need for response

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4
Q

Subjective refraction

A

Need response

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5
Q

For diplopia charting

A

Trial lens

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6
Q

Assess binocular vision

A

Trial lens

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7
Q

Measure lenses (hand neutralization)

A

Trial lens

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8
Q

Contents or accessories of trial set

A

Trial frame
Trial lenses
Prisms
JCC
Frosted lens
Plano lens
Red green cobalt blue filter
Red white maddox rod
Stenopaic slit
Occluder
Pinhole
Near VA chart
PD rule

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9
Q

an eyeglass frame designed to permit insertion of different lenses used in correcting refractive errors of vision

A

Trial frame

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10
Q

4-5 components

A

1- high powered lens
2- spherical lens
3- cylindrical lens
4- accessory and prisms

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11
Q

Accommodates up to five, 38mm lenses for each eye

A

Full aperture frame

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12
Q

Independent screw adjustment for PD to 48 to 80mm

A

Full aperture frame

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13
Q

It holds up to four, 38mm lenses for each eye. Accessories may be easily inserted and extracted

A

Reduced aperture frame

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14
Q

Nosepiece for child. PD of 54 to 58mm and available for adults with PD 59 to 67mm

A

Half eye trial frame

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15
Q

Power is the SAME all throughout

A

Spherical lens

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16
Q

Convex

A

Plus

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17
Q

Concave

A

Minus

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18
Q

Thicker at the center thinner at the edge

A

Sphere Plus lenses (convex)

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19
Q

Made up of base-in prism

A

Sphere plus lenses

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20
Q

Converge rays of light

A

Sphere Plus lenses

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21
Q

CC lenses; thinner at center thicker at sides

A

Sphere minus lenses

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22
Q

Made up of base out prisms

A

Sphere minus lenses (concave)

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23
Q

Diverge rays of light

A

Sphere minus lenses

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24
Q

Could be minus or plus with axis markings

A

Cylinder

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25
Q

Surface has a flatter curve and and a greater curve

A

Cylinder

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26
Q

Used to measure and correct astigmatism

A

Cylinder lenses

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27
Q

Is a refractive medium having 2 plane surfaces inclined at an angle

A

Prism

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28
Q

Used to measure and correct the eye’s deviation from its normal plane

A

Prism

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29
Q

Used in dissociation tests

A

Prism

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30
Q

Comes in power range of 0.5 prism D, 1 PD to 6PD in 1P steps

A

Prism

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31
Q

A wedge shape probe body which is capable of diffracting rays of light into its components colors

32
Q

A lens with zero power

A

Plano power lens

33
Q

Used to satisfy and identify malingering patients

A

Plano power lens

34
Q

Used in balancing tests such as duochrome or worth 4 dot test

A

Red green filter

35
Q

Used to find our suppression of eyes

A

Red green filter

36
Q

May be user to measure fusion

A

Red green filter

37
Q

Used to check color sense of the retina

A

Red green filter

38
Q

To check whether color deficiency can be managed with a filter

A

Red green filter

39
Q

Used in association with fluorescein straining during slit lamp exam

A

Cobalt blue

40
Q

Measurement of dry eye

A

Cobalt blue

41
Q

Used to enhance contrast of patients with decreased contract sensitivity

A

Amber (yellow)

42
Q

Made up of series of red cylinders and used to deter heterophoria and cyclophoria

A

Maddox rod

43
Q

Used in dissociation test

A

Maddox rod

44
Q

A black opaque disc with a horizontal thin slit at the center

A

Stenopaic slit

45
Q

Can be used to taking VA in all meridians of the px eyes

A

Stenopaic slit

46
Q

Differentiate causes of haloes in Fincham’s test

A

Stenopaic slit

47
Q

An opaque plastic disc

48
Q

To occlude on eye and to relax accommodation

49
Q

Used to dissociate fusion and used to close one eye, while the other eye can be tested for visual acuity

50
Q

Opaque disc with pinhole of 1-2mm diameter in its centre

51
Q

Allows only a pencil of light pass through the corneas

52
Q

Helps to determine whether eye has a refractive or pathological error

53
Q

Pinhole of 1.32mm is more effective

54
Q

A valuable tool used to check the power and axis of the correcting cylinder

55
Q

A semi-opaque white lens with a matte finish

A

Frosted lens

56
Q

Used as an occluder for children

A

Frosted lens

57
Q

Used in measuring inter-pupillary distance and/or pupil diameter

58
Q

Introduced by richard snellen

A

Reduced snellen
Near chart

59
Q

Can be user to measure near point of accommodation

A

Reduced snellen

60
Q

Consist of ordinary printers fonts of varying sizes

A

Jaegers card

61
Q

Prints are marked from 1-7: px acuity is labeled as J1 to J7 depending upon the print the px can read clearly

A

Jaegar Card

62
Q

Used in taking near rx or presbyopic add

A

Jaeger’s card

63
Q

Also used in taking near prescription or presbyopic add

A

0.63 EM type

64
Q

A small handheld chart that has paragraphs of tests which is smallest at the top and largest at the bottom

A

NEAR chart

65
Q

N6 is normal; n referring to near and 6 referring to size of letters

A

Near Chart

66
Q

NEAR VA CHARTS

A

Reduced snellen
Jaeger’s chart
0.63 EM type
Near chart

67
Q

OD +2.00 = -1.25 x 90
OS +4.00 = -0.25 x 85

68
Q

OD -3.00 = -0.50 x 175
OS -0.50 = -3.00 x 145

69
Q

OD frosted lens
OS 2 prism diopter base out

70
Q

OD +4.00 D with horizontal red maddox 2 prism diopter
OS open

71
Q

OD +2.00 = +3.00 x 65
OS +2.00 = +1.00 x 105
Add 2.50

72
Q

OD occluder
OS pinhole

73
Q

OD +11.00 with red filter
OS -15.00 with green filter

74
Q

OD stenopaic slit
OS occluder

75
Q

OD +4.00 = -1.00 x 70 with 5 prism base out
OS +8.00 = -2.00 x 10 with 6 prism base out

76
Q

OD -1.00
OS -0.50 = -0.50 x 55 with white vertical maddox

Clinical Refraction (Laboratory) (1 decks)

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