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Final Review > Refract Theory Review > Flashcards

Refract Theory Review Flashcards

(68 cards)

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1
Q

The average power of the eye in total is +43.00D

T/F

A

False

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2
Q

The optical image is that image formed by the eyes optical system and may or may not be on the retina.

T/F

A

true

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3
Q

The retina image is that image formed on the retina and may or may not be clear.

T/F

A

True

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4
Q

The larger the blue circle on the retina, the stronger the refractive error.

T/F

A

true

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5
Q

All of the following are associated with hyperopia except:
Eyeball too small
Corrected with plus lenses
light from distance point comes behind retina
distance between lens and retina is too great

A

distance between lens and retina is too great

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6
Q

In regard to visual acuity, 20/20 Snellen E, 6/6 metric, and 1.0 all mean the same thing.

T/F

A

true

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7
Q

The fovea centrallis contains the highest percentage of rods in the retina.

T/F

A

false

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8
Q 
The main function of the sclera is:
Nourishment
Muscular
Protection
Cosmetic
A

Protection

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9
Q

An uncorrected myope has good VA at distance but poor VA at near.

T/F

A

False

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10
Q

Axial Hyperopia is a refractive error in which the length of the eyeball is too long.

T/F

A

False

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11
Q

Latent Hyperopia is a condition in which a client diagnosed with Presbyopia sees clearly in the distance while looking through their reading Rx.

T/F

A

false

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12
Q

An uncorrected myope over accommodates and leans towards esophoria

T/F

A

false

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13
Q

The crystalline lens has 2 converging minus power surfaces

T/F

A

false

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14
Q

To see clearly, the eye’s optical system must form a point focus on the nerve of the retina.

t/f

A

false

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15
Q

The human seeing system consists of 2 sets of lenses, 2 sensing devices and 1 brain and is used to describe how we see.

t/f

A

true

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16
Q

The ability of the eye to change its shape to focus at near is known as:

A

accomatdation

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17
Q

Your pupil dilates during accommodation

t/f

A

false

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18
Q

One of the functions of the ciliary muscle of the eye is to stimulate accommodation.

t/f

A

true

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19
Q

Match the refractive error:

-2.50 sph

A

Simple Myopia

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20
Q

Match the refractive error:

+1.25 sph

A

Simple Hyperopia

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21
Q

Match the refractive error:

+1.50-1.50x180

A

Simple hyperopic astigmatism

pl+1.50x090

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22
Q

Match the refractive error:

pl-1.50x180

A

Simple Myopic Astigmatism

-1.50+1.50x090

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23
Q

Match the refractive error:

+1.00+050x090

A

Compound Hyperopic Astigmatism

+1.50-0.50x180

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24
Q

Match the refractive error:

-3.00-4.00x090

A

Compound Myopic Astigmatism

-7.00+4.00x180

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25
Match the refractive error: +1.50-2.50x090
Mixed Astigmatism -1.00+2.50x180
26
Astigmatism is a refractive condition in which the eyes optical system is incapable of forming a point image for a point object. t/f
true
27
Exophoria is a tendency for the eyes to turn in t/f
false
28
An uncorrected myope under accommodates and leans towards exophoria. t/f
true
29
An astigmatic eye could focus light rays both in front of and behind the retina. t/f
true
30
Axial myopia is nearsightedness due to a longer than average global length of the eye. t/f
true
31
Hyperopia can cause exophoria t/f
false
32
The myope can improve VA by accommodating the object to be viewed. t/f
false
33
The condition in which a client diagnosed with presbyopia sees clearing in the distance while looking through their reading rx is known as a latent hyperope. t/f
true
34
Presbyopia can be corrected by refractive surgery. t/f
false
35
An uncorrected hyperope over accommodates and leans towards esophoria. t/f
true
36
The cornea has the greatest dioptric power. t/f
true
37
Corneal Hyperopia is a refractive error in which the cornea of the eye is too steep. t/f
false
38
Of all the refractive errors, myopia is the only one to show definite environmental factors on the incidence, distribution, degree and changes. t/f
true
39
``` Steep K at 180 , flat K at 90 is considered MIX ATR WTR IRR ```
ATR
40
If the vertical light rays focus on the retina, and the horizontal light ray focus in front of the retina, then the error is: CMA, CHA SHA, SMA, N/A
Simple Myopic Asitgmatism
41
The avg. 40 yr old has an amplitude of: 14. 00D 10. 00D 4. 50D 2. 50D
4.50D
42
BO ^ have been used to control myopic progression. t/f
false
43
Pseudomyopia is a condition of on-going spasm of accommodation and requires plus lenses to correct. t/f
true
44
Total Hyperopia plus latent hyperopia equals manifest hyperopia t/f
false
45
Asthenopia is a symptom of an uncorrected refractive error t/f
true
46
Fogging or cyclopliglics is commonly used to bring out latent hyperopia to manifest. t/f
true
47
An example of an OBJECTIVE refraction is....
retinscopy or auto-refraction
48
Hyperopia that is uncovered during a cycloplegic refraction and is added to the latent hyperopia is known as:
total
49
Congenital myopia is normally acquired with excessive work on computers t/f
false
50
Accommodation uncovered during a normal non cycloplegic refraction is known as manifest or latent?
latent
51
Over accommodation can cause divergent strabismus. t/f
false
52
``` Approx. 2/3 of the eyes refractive power is due to the cornea. The other refracting capability is due to the: Retina Choroids Crystalline lens Rods and cones ```
Crystalline lens.
53
``` Steep K @ 90, flat K @ 180 IRR WTR ATR MIX ```
WTR
54
Irregular astigmatism occurs when the meridians are 90 degrees apart an an oblique axis. t/f
false
55
Accommodation uncovered during a normal non cycloplegic refraction is known as Manifest or latent
manifest
56
Pseudmyopia can be corrected using minus lenses t/f
false
57
Light focuses before retina
simple myopia
58
Light focuses behind retina
simple hyperopia
59
Light focuses on retina and focuses before
simple myopic astig
60
Light focuses on retina and focuses behind
Simple hyperopic astig
61
Light focuses behind retina on different points
CHA
62
Light focuses before retina in different points.
CMA
63
Light focuses before and after retina
Mixed
64
total hyperopia = manifest + latent t/f
true
65
Latent Hyperopia-
not revealed by normal refraction.
66
manifest hyperope
revealed by routine refraction (what turns up in phoropter)
67
congenital myopia
Present at birth
68
acquired myopia
a result of prolonged stress on the eyes during close work.

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