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ABDO FQEs > D3 & 4 - Low Vision Appliances > Flashcards

D3 & 4 - Low Vision Appliances Flashcards

1
Q

Hand Held Magnifier:

Features

A

Simple magnifier

Single plus power biconvex lens

May be illuminate

Suitable for patients with AMD

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2
Q

Hand Held Magnifier:

Functional Benefits

A

Convenient for spot use

Common so psychologically acceptable

Compact, light weight & portable

Flexible task distance

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3
Q

Hand Held Magnifier:

Functional Limitations

A

Requires steady hands

Requires training

Subject to aberrations when used binocularly

Higher powers produce more aberrations with smaller FOV

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4
Q

Hand Held Magnifier:

Advice on use

A

Place on page and pull away until image is clear

Keep page flat

Steady eye strategy

Good illumination - angle poised lamp directly on page

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5
Q

Stand Magnifier:

Features

A

Simple magnifier

Cuff to set lens at correct distance

Internally illuminated

Can be available as one handle with changeable heads

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6
Q

Stand Magnifier:

Functional Benefits

A

Easy to maintain correct working distance

Stand may hold in place, allowing hands free

Internally illuminated, providing correct lighting

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7
Q

Stand Magnifier:

Functional Limitations

A

Fixed focus - specific specs may be required

Bulkier due to illumination

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8
Q

Stand Magnifier:

Advice on use

A

Place directly on page for focus

Use with reading specs

Keep page flat

Ensure batteries replaced frequently

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9
Q

Bar Magnifier:

Features

A

Simple loupe magnifier

Single plus lens

Acrylic or perspex

Can sit directly on age

May have line to aid tracking

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10
Q

Bar Magnifier:

Functional Benefits

A

Simple to use

No dexterity issues

Can maintain binocular vision

Cheap

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11
Q

Bar Magnifier:

Functional Limitations

A

Requires flat, firm surface

Narrow field of view

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12
Q

Bar Magnifier:

Advice on use

A

Position horizontally, directly on reading material

Use line to guide position

Use with near specs

When not in use, keep in case and out of direct sun

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13
Q

Pocket Magnifier:

Features

A

Simple magnifier

Single plus lens

May have multiple lenses in once case

Pocket size

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14
Q

Pocket Magnifier:

Functional Benefits

A

Small, portable and discreet

Lightweight

Psychologically and cosmetically acceptable

Cheap

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15
Q

Pocket Magnifier:

Functional Limitations

A

Small FOV

Not for prolonged use

Steady hand required

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16
Q

Pocket Magnifier:

Advice on use

A

Hold on material and bring away until clear

Use with distance specs

Bring closer to eye for increased FOV

For short tasks only

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17
Q

Prismatic Readers:

Features

A

High powered reading specs

Incorporate base IN prism to aid convergence

Usually half eye

Available up to +10 with 12 prims

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18
Q

Prismatic Readers:

Functional Benefits

A

Can maintain BV for near task with high adds

Half eye allows simultaneous distance vision

Hands free

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19
Q

Prismatic Readers:

Functional Limitations

A

Short working distance

Heavy and unattractive

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20
Q

Prismatic Readers:

Advice on use

A

Wear for specific near tasks only

Close working distance, start with page away and bring closer

Good illumination

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21
Q

Spectacle Mounted Telescope:

Features

A

Galilean system

Positive objective and negative eyepiece

Can have adjustable focus

Can be permanently fused, or clip on

22
Q

Spectacle Mounted Telescope:

Functional Benefits

A

Variable working distance

Only reasonable solution for distance magnification

Hands free

Good depth of field

23
Q

Spectacle Mounted Telescope:

Functional Limitations

A

Psychologically unacceptable

Heavy and bulky

Accurate centration is essential

Small field of view

24
Q

Spectacle Mounted Telescope:

Advice on use

A

Use for specific tasks

Can adjust focus depending on working distance

Do not walk around when using

Requires good illumination

25
Q

Monocular Hand Held Telescope:

Features

A

May be keplarian or galilean

Hand held and monocular

May clip to specs frame

May have adjustable focus

26
Q

Monocular Hand Held Telescope:

Functional Benefits

A

Handheld, small and portable

Adjustable focus for range of working distances

Can clip on to specs for hands free

High mag available

27
Q

Monocular Hand Held Telescope:

Functional Limitations

A

Stead hand required

Dexterity required

Only good for stationary objects

Monocular so not for prolonged use

28
Q

Monocular Hand Held Telescope:

Advice on use

A

Adjustable eyepiece to focus

Use for specific spot tasks as mono use

Use with dominant eye

Hold steady, may require elbow support

29
Q

Spectacle Mounted Magnifier:

Features

A

Plus powered lens mounted or clipped on specs

Patient’s own Rx can be glazed into housing specs

May be binocular or monocular

30
Q

Spectacle Mounted Magnifier:

Functional Benefits

A

Good field of view

Coating and tint available to carrier lens

Hands free

BV can be maintained

31
Q

Spectacle Mounted Magnifier:

Functional Limitations

A

May be psychologically unacceptable

Short working distance difficult to maintain

Accurate centration is essential

Poor illumination - extra required

32
Q

Spectacle Mounted Magnifier:

Advice on use

A

Hold page away and bring closer

Use for specific near tasks

Do not walk around in when wearing

Good illumination required

33
Q

Max TV Unit or Coil Distance Unit:

Features

A

Galilean telescope system

Adjustable focus for room distance use

Frosted objective lens housing eliminates reflections

34
Q

Max TV Unit or Coil Distance Unit:

Functional Benefits

A

Simple and economic solution

Can be used for DV and some IV

Hands free

35
Q

Max TV Unit or Coil Distance Unit:

Functional Limitations

A

Obvious - psychologically unacceptable

Heavy and uncomfortable for long wear

Requires dexterity for adjustments

Cannot compensate a high Rx

36
Q

Max TV Unit or Coil Distance Unit:

Advice on use

A

Use for specific task

Demonstrate adjustment of working distance

Do not walk when wearing

37
Q

Sheet Magnifier:

Features

A

Fresnel lens

Multiple concentric rings providing magnification

Can have foldable stand for support

38
Q

Sheet Magnifier:

Functional benefits

A

Large field of view due to size

Cosmetically acceptable

Inexpensive

Light and easily portable

39
Q

Sheet Magnifier:

Functional Limitations

A

Only available in low magnification

Posture sometimes difficult to maintain

Optically poor due to aberrations

40
Q

Sheet Magnifier:

Advice on use

A

Hold on page and move away until clear

Use with near vision specs

Keep page flat

Good illumination

41
Q

Chest Magnifier:

Features

A

Low magnification plus powered lens

Bracket and neck strap to support against chest

May have smaller, high mag segment

42
Q

Chest Magnifier:

Functional Benefits

A

Constantly supported at the required working distance

Hands free

Low magnifications, means less aberrations and wider FOV

Inexpensive

43
Q

Chest Magnifier:

Functional Limitations

A

Only low magnifications available

Move with patient, must stay still

Not ideal for patients with neck problems as heavy

44
Q

Chest Magnifier:

Advice on use

A

Place at task then move up until clear

Position closer to eyer for wider FOV and read specs for increased mag

Use while seated

May require additional lighting

45
Q

Hyperocular:

Features

A

Spectacle mounted magnification

Single high powered plus lenticular

Other ens occluded or frosted

Patient’s Rx can be included

46
Q

Hyperocular:

Functional Benefits

A

Psychologically more accepted

Able incorporate prescription

Hands free

Large FOV due to short eye-mag distance

47
Q

Hyperocular:

Functional Limitations

A

Short working distance difficult to maintain

Monocular only

Required good illumination due to short distance

48
Q

Hyperocular:

Advice on use

A

Hold page in front of dominant eye and bring closer until clear

Use for specific tasks

Do not walk around wearing

Use good lighting - angle poised lamp

49
Q

Tinted Overspectacles:

Features

A

Plano tinted/filter lenses

Wrap around design shields against disability glare

Provide UVA and UVB protection

Specific filters absorb certain wavelengths

50
Q

Tinted Overspectacles:

Functional Benefits

A

Light weight

Able to use with own specs

May filter options

Wrap around shields from glare

51
Q

Tinted Overspectacles:

Functional Limitations

A

Bulky and unattractive

Only of benefit in daylight

Depending on filter, can restrict driving

52
Q

Tinted Overspectacles:

Advice on use

A

Wear over existing specs if required

Wear in bright conditions or if light problem

Do not wear when driving due to contrast filters

ABDO FQEs (5 decks)

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