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Primary Eye and Vision Care > Aniseikonia and Anisometropia > Flashcards

Aniseikonia and Anisometropia Flashcards

1
Q

Greek word “unequal images”

A

aniseikonia

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2
Q

It is a binocular condition, so the image in one
eye is perceived as different in size compared to
the image in the other eye.

A

aniseikonia

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3
Q

he designed the iseikonic lenses for aniseikonia

A

Von Rohr

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4
Q

Commented upon the probability of unequal

image sizes. (1864)

A

Donders

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5
Q

Discussed the possibility (1903)

A

C.Hess

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6
Q

Condition in which ocular images are unequal in

size and shape

A

aniseikonia

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7
Q

Condition in which the size and shape of the

ocular images are equal

A

iseikonia

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8
Q

Lenses which correct aniseikonia and include also

the correction of refractive error.

A

iseikonic lenses

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9
Q

2 types of aniseikonia

A
  1. Static Aniseikonia

2. Dynamic Aniseikonia

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10
Q
  • eyes are gazing in a certain direction

- images are different in size

A

Static Aniseikonia

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11
Q
  • (optically induced) anisophoria
  • eyes have to rotate a different amount to gaze at
    the same point in space
A

Dynamic Aniseikonia

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12
Q

2 classifications of aniseikonia

A
  1. Symmetrical Aniseikonia

2. Asymmetrical Aniseikonia

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13
Q

3 types of Symmetrical Aniseikonia

A
  1. Overall
  2. Meridional
  3. Compound
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14
Q

4 types of Asymmetrical Aniseikonia

A
  1. Pincushion
  2. Barrel
  3. Prismatic
  4. Oblique
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15
Q

Variation in size differ from different positions of

the visual field

A

Asymmetrical Aniseikonia

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16
Q

image difference increases progressively in one direction

A

Prismatic

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17
Q

image distortion increases progressively in both directions

A

Pincushion

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18
Q

image distortion decreases progressively in both directions

A

Barrel

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19
Q

image size remains the same but there occurs an oblique distortion of shape

A

Oblique

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20
Q

the size of one ocular image is symmetrically larger than the other

A

Overall

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21
Q

combination of overall and meridional is manifested

A

Compound

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22
Q

the size of one ocular image is symmetrically larger than the other in one meridian only

A

Meridional

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23
Q

He utilized the classification as normal and abnormal

A

Davis

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24
Q

asymmetric convergence and stereoscopic disparities exists as when viewing the object located to one side

A

normal

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25
Q

based on binocular space perception

A

SPACE EIKONOMETRIC METHOD

26
Q

based on directly comparing perceived image sizes between the two eyes

A

DIRECT COMPARISON METHOD

27
Q

an instrument for measuring aniseikonia

A

Space Eikonometer

28
Q

TRUE OR FALSE.

Aniseikonia either in one or more meridians can be measured by means of an adjustable magnifying device before one eye.

A

TRUE

29
Q

3 commercially available direct comparison

tests are _________

A
  1. New Aniseikonia Test (Awaya Test)
  2. Basic Aniseikonia Test (version 1)
  3. Aniseikonia Inspector (version 3)
30
Q

provides a manual method to detect and calibrate the

Aniseikonic condition

A

New Aniseikonia Test (Awaya Test)

31
Q

is an easy-to-use Windows software program to

test the aniseikonia of a patient

A

Basic Aniseikonia Test

32
Q

use of red-green glasses

A

Basic Aniseikonia Test

33
Q

is a Windows software program for the clinical

management of aniseikonia

A

Aniseikonia Inspector (version 3)

34
Q

A type of test which contains

  • an advanced aniseikonic test
  • a design tool to calculate correcting prescriptions (aniseikonia and anisophoria corrections)
A

Aniseikonia Inspector (version 3)

35
Q

ANISOMETROPIA

A

ANISOMETROPIA

36
Q

The condition in which the refractive status is equal in the two eyes.

A

isometropia

37
Q

is defined as a condition in which the refractive status of one eye differs from that the other

A

anisometropia

38
Q

A form of anisometropia in which one eye is myopic and the other hyperopic

A

antimetropia

39
Q

The condition in which the two eyes have unequal refractive power. One eye may be myopic (nearsighted) and the other hyperopic (farsighted) or one eye may be
markedly stronger than the other.

A

ANISOMETROPIA or ASYMMETROPIA

40
Q

different type of errors such as hyperopia vs. myopia or spherical vs. astigmatic

A

Antimetropia

41
Q

different amount of the same error of refraction

A

Anisometropia

42
Q

this occurs because of differential growth of the eyeball of both eyes. It is hereditary in origin.

A

Congenital Anisometropia

43
Q

created by trauma, pathology or the results of systemic

changes

A

Acquired Anisometropia

44
Q

CLASSIFICATION OF ANISOMETROPIA

A
  1. Absolute Anisometropia

2. Relative Anisometropia

45
Q

It is that type of refractive anomaly in which although the total refraction of the two eyes is equal, the component elements in each show relatively large
differences. In other words, the total refraction of the two eyes can be equal, but the axial length may be different.

A

Relative

46
Q

It is a condition in which the refractive power of the two eyes is unequal.

A

Absolute

47
Q

Types of Absolute Anisometropia

A
  1. Simple
  2. Compound
  3. Mixed
  4. Simple Astigmatic Anisometropia
  5. Compound Astigmatic Anisometropia
  6. Mixed Astigmatic Anisometropia
48
Q

when one eye is normal and the other has either myopic or hyperopic astigmatism.

A

Simple Astigmatic Anisometropia

49
Q

In this, one eye is normal and the other is either hypermetropic or myopic

A

Simple

50
Q

In this both eyes are ametropic. One eye is
hyperopic and the other is myopic. This is called
antimetropia.

A

Mixed

51
Q

when both eyes are astigmatic but of unequal

degree.

A

Compound Astigmatic Anisometropia

52
Q

In this, both eyes are ametropic either hyperopic or myopic, but one eye has a higher refractive error

A

Compound

53
Q

A concomitant convergent squint occurs in children with the eye having the defect becoming convergent.

A

Strabismus

54
Q

If the defect in one eye is high and if its visual acuity is not good, the eye can be excluded altogether from vision and the eye becomes amblyopic.

A

Amblyopia

55
Q

TRUE OR FALSE.
In small degrees of anisometropia, ALTERNATING
vision occurs.

A

FALSE.

Binocular

56
Q

Anisometropia is a serious concern in newborns and young children because it can lead to ___________

A

amblyopia

57
Q

is a clinical test mainly used for assessing a patient’s degree of “binocular vision” and “binocular single vision”.

A

Worth Four Light Test

58
Q

for unilateral high myopia, astigmatism, and hypermetropia.

A

Refractive corneal surgery

59
Q

advised for higher degrees of anisometropia

A

contact lens

60
Q

for uniocular aphakia

A

IOL implantation

Primary Eye and Vision Care (4 decks)

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