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Primary Eye and Vision Care > Aniseikonia and Anisometropia > Flashcards

Aniseikonia and Anisometropia Flashcards

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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
based on binocular space perception
SPACE EIKONOMETRIC METHOD
26
based on directly comparing perceived image sizes between the two eyes
DIRECT COMPARISON METHOD
27
an instrument for measuring aniseikonia
Space Eikonometer
28
TRUE OR FALSE. | Aniseikonia either in one or more meridians can be measured by means of an adjustable magnifying device before one eye.
TRUE
29
3 commercially available direct comparison | tests are _________
1. New Aniseikonia Test (Awaya Test) 2. Basic Aniseikonia Test (version 1) 3. Aniseikonia Inspector (version 3)
30
provides a manual method to detect and calibrate the | Aniseikonic condition
New Aniseikonia Test (Awaya Test)
31
is an easy-to-use Windows software program to | test the aniseikonia of a patient
Basic Aniseikonia Test
32
use of red-green glasses
Basic Aniseikonia Test
33
is a Windows software program for the clinical | management of aniseikonia
Aniseikonia Inspector (version 3)
34
A type of test which contains - an advanced aniseikonic test - a design tool to calculate correcting prescriptions (aniseikonia and anisophoria corrections)
Aniseikonia Inspector (version 3)
35
ANISOMETROPIA
ANISOMETROPIA
36
The condition in which the refractive status is equal in the two eyes.
isometropia
37
is defined as a condition in which the refractive status of one eye differs from that the other
anisometropia
38
A form of anisometropia in which one eye is myopic and the other hyperopic
antimetropia
39
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.
ANISOMETROPIA or ASYMMETROPIA
40
different type of errors such as hyperopia vs. myopia or spherical vs. astigmatic
Antimetropia
41
different amount of the same error of refraction
Anisometropia
42
this occurs because of differential growth of the eyeball of both eyes. It is hereditary in origin.
Congenital Anisometropia
43
created by trauma, pathology or the results of systemic | changes
Acquired Anisometropia
44
CLASSIFICATION OF ANISOMETROPIA
1. Absolute Anisometropia | 2. Relative Anisometropia
45
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.
Relative
46
It is a condition in which the refractive power of the two eyes is unequal.
Absolute
47
Types of Absolute Anisometropia
1. Simple 2. Compound 3. Mixed 4. Simple Astigmatic Anisometropia 5. Compound Astigmatic Anisometropia 6. Mixed Astigmatic Anisometropia
48
when one eye is normal and the other has either myopic or hyperopic astigmatism.
Simple Astigmatic Anisometropia
49
In this, one eye is normal and the other is either hypermetropic or myopic
Simple
50
In this both eyes are ametropic. One eye is hyperopic and the other is myopic. This is called antimetropia.
Mixed
51
when both eyes are astigmatic but of unequal | degree.
Compound Astigmatic Anisometropia
52
In this, both eyes are ametropic either hyperopic or myopic, but one eye has a higher refractive error
Compound
53
A concomitant convergent squint occurs in children with the eye having the defect becoming convergent.
Strabismus
54
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.
Amblyopia
55
TRUE OR FALSE. In small degrees of anisometropia, ALTERNATING vision occurs.
FALSE. | Binocular
56
Anisometropia is a serious concern in newborns and young children because it can lead to ___________
amblyopia
57
is a clinical test mainly used for assessing a patient's degree of "binocular vision" and "binocular single vision".
Worth Four Light Test
58
for unilateral high myopia, astigmatism, and hypermetropia.
Refractive corneal surgery
59
advised for higher degrees of anisometropia
contact lens
60
for uniocular aphakia
IOL implantation

Primary Eye and Vision Care (4 decks)

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