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Low vision > PREFINAL > Flashcards

PREFINAL Flashcards

1
Q

Consist of one or more lenses placed between the eye

A

Optical Devices

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2
Q

Optical devices is also known as

A

Low vision devices

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3
Q

2 types of optical devices

A

Distance
Near

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4
Q

A type of distance optical devices

A

Telescope devices

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5
Q

Types of near optical devices

A

Hand held magnifier
Stand magnifier
Spectacle magnifier

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6
Q

What optical device produces an enlarged virtual image behind the magnifier

A

Hand held magnifier

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7
Q

In hand held magnifier, distance correction should be used because the image is formed at ___

A

Optical infinity

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8
Q

Used for near viewing especially reading or any near activity

A

Hand held magnifier

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9
Q

Advantages of hand held magnifier

A

Variable eye to lens distance
Normal reading distance
Convenient for short term tasks
Fairly inexpensive
Portable

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10
Q

Disadvantages of hand held magnifier

A

Tremors in older patients can cause problem in maintaining focus
Steady handling is required
Decreased field of view
One hand is occupied

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11
Q

What optical device produces an enlarged virtual image in front of the eye

A

Stand magnifier

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12
Q

An optical low vision device used for near

A

Stand magnifier

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13
Q

Optical device helpful for school aged children and can be used in high magnification

A

Stand magnifier

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14
Q

Advantages of stand magnifier

A

Device of choice for tremors, arthritis, constricted fields
May have its own light source
Portable

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15
Q

Disadvantage of stand magnifier

A

Image distortion
Reduced field of view
Needs constant head down for reading
Lens mounting
Poor posture is maintained
Requires a flat surface to place reading material

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16
Q

2 telescopic devices

A

Galilean telescope
Keplerian telescope

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17
Q

Elements of telescopes

A

Objective lens
Eyepiece lens

18
Q

Telescope which comprises of convergent objective lens and divergent eyepiece lens

A

Galilean telescope

19
Q

Most commonly used telescope in low vision assessment

A

Galilean telescope

20
Q

Image formed by Galilean telescope

A

Upright image

21
Q

It comprises of a negative eye piece lens and a positive objective lens

A

Galilean telescope

22
Q

Advantages of Galilean telescope

A

Small compact light unit
Easy to produce
Upright image

23
Q

Disadvantage of Galilean telescope

A

Low magnification 2x-3x
Restricted field of view

24
Q

It comprises a convergent objective and eyepiece lens

A

Keplerian (Astronomical) Telescope

25
Q

Image formed by Kpelerian telescope

A

Inverted image

26
Q

Advantages of Keplerian telescope

A

Larger field of vision
High magnification 6x-8x

27
Q

Disadvantage of Keplerian telescope

A

Inverted image
Heavy
Complicated
Difficult to use

28
Q

Criteria used when looking at a low vision telescope

A

Maginication extent
Ability to telescope to transmit light
Field of view

29
Q

The greater the amount of magnification, the smaller will be the ________

A

Field of view

30
Q

Electronic LVD used forr near work

A

CCTV system

31
Q

Disadvantages of CCTV:

A

Typically not portable
Expensive
Takes time to learn and handle, but very useful if adapted properly.

32
Q

A magnifying aid held in the hand in front of the eye for viewing small objects at close range. It is good for spot viewing or reading, with usual powers of 2x to 5x

A

HAND HELD MAGNIFIER

33
Q

A magnifying aid with internal illumination held in the hand in front of the eye for viewing small objects at close range. It is good for spot viewing or reading, with usual powers of 2x to 5x

A

ILLUMINATED HAND HELD MAGNIFIER

34
Q

A magnifying aid which is compact and can be folded, and is held in the hand in front of the eye for viewing small objects at close range. It is good for spot viewing or reading, with usual powers of 2x to 5x

A

FOLDABLE MAGNIFIER

35
Q

A magnifying aid fitted in a casing and held on the object to be viewed at close range. It is good for extended reading and is usually used in conjunction with a reading stand. Its usual powers range from 2x to 15x

A

STAND MAGNIFIER

36
Q

A magnifying aid fitted in a casing with internal illumination and held on the object to be viewed at close range. It is good for extended reading and is usually used in conjunction with a reading stand. Its usual powers range from 2x to 15x

A

ILLUMINATED STAND MAGNIFIER

37
Q

Type of stand magnifier that is a transparent magnifying aid held on the reading material. It provides good contrast and is usually available in 1.5x to 2.5x

A

DOME OR BAR MAGNIFIER

38
Q

A combination of lenses fitted in a tubular form to view objects from far distances to get a magnified view. Their powers range from 2x to 10x

A

TELESCOPES

39
Q

Telescope which can be used to view objects at close ranges i.e. 25cm to infinity

A

EXTRA-SHORT FOCUS

40
Q

Telescope to view near objects with a clip to attach on the spectacle frame. It is good for intermediate tasks, with powers from 2x to 4x

A

NEAR CLIP-ON MONOCULAR

Low vision (5 decks)

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