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OPT-2375 Refractometry Theory I > 2375 > Flashcards

2375 Flashcards

Finals prep

1
Q

T/F: Congenital myopia is normally acquired with excessive work on computers.

A

FALSE

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2
Q

T/F: Irregular astigmatism occurs when the principal meridians are 90 degrees apart at an oblique axis.

A

FALSE

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3
Q

T/F: Pseudomyopia is a condition of on-going spasm of accommodation and required plus lenses to correct.

A

TRUE

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4
Q 
All of the following conditions require partial correction of hyperopia except: 
A-large amounts of latency 
B-exophoria 
C-esophoria 
D-very young patient
A

C-ESOPHORIA

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5
Q 
An astigmatic correction with its steepest power at 180 degrees is considered: 
 A-with the rule 
B-against the rule 
C-oblique 
D-lenticular
A

B-against the rule

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6
Q

T/F: Pseudomyopia can be corrected using minus lenses.

A

FALSE

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7
Q

The most stable refractive error which rarely changes over time is:

A

ASTIGMATISM

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8
Q 
Methods that have been used to control myopic progression include all of the following except: 
A-base out prism 
B-visual training 
C-bifocal correction 
D-contact lenses
A

A-base out prism

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9
Q 
Accommodation that is uncovered during a normal non cycloplegic refraction is known as: 
A-manifest 
B-latent 
C-total 
D-hyperopia
A

A-manifest

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10
Q

The most common refractive error in the general population is:

A

ASTIGMATISM

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11
Q

T/F: Excessive near work or computer use can lead to acquired myopia

A

TRUE

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12
Q 
All of the following conditions require full correction of hyperopia except: 
A-marked eyestrain 
B-decreased amplitude of accommodation 
C-maximum acuity needed at distance 
D-constant esotropia
A

C-maximum acuity needed at distance

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13
Q

An astigmatic correction with its steepest power at 90 degrees is considered:

A

WTR

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14
Q

T/F: Of all of the refractive errors, myopia is the only one to show definite environmental factors on the incidence, distribution, degree and changes.

A

TRUE

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15
Q

A place where there is a high incidence of myopia is:

A

CHINA

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16
Q

T/F: Total hyperopia plus latent hyperopia equal manifest hyperopia.

A

FALSE

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17
Q

A place where there is a low incidence of myopia is:

A

AFRICA

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18
Q

T/F: Fogging or cyclopligics is commonly used to bring out latent hyperopia to manifest.

A

TRUE

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19
Q

Hyperopia that is uncovered during a cycloplegic refraction and is added to the latent hyperopia is known as:

A

TOTAL

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20
Q

The refractive error that most likely has environmental contributing factors is:

A

MYOPIA

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21
Q

An example of an objective refraction is:

A

retinoscopy or autorefraction

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22
Q 
Over accommodation can cause all of the following symptoms except: 
A-nausea 
B-headache 
C-browache 
D-divergent strabismus
A

D-divergent strabismus

23
Q

T/F: Asthenopia is a symptom of an uncorrected refractive error.

A

TRUE

24
Q 
Residual astigmatism is due to: 
A-anterior corneal surface 
B-posterior corneal surface 
C-lenticular surface 
D-both b and c are correct
A

D-both b and c are correct

25
Q 
Accommodation not uncovered during a normal non cycloplegic refraction is known as: 
A-manifest 
B-latent 
C-total 
D-hyperopia
A

B-latent

26
Q 
examples of an subjective refraction is all of the following except:
A-subjective refinement 
B-retinoscopy or autorefraction 
C-near point add test 
D-ocular motility tests
A

B-retinoscopy or autorefraction

27
Q

More than 2/3 of the eye’s refractive power is due to the:

A

CORNEA

28
Q

T/F The average power of an eye in total is 43.00 Diopters.

A

FALSE

29
Q

T/F To see clearly, the eye’s optical system must form a point focus on the optic nerve of the retina

A

FALSE

30
Q

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

A

ACCOMMODATION

31
Q

All of the following are associated with hyperopia except:
A-eyeball too small
B-corrected with plus lenses
C-light from distance point will come to a focus behind the retina
D-distance between the lens and retina is too great

A

D-distance between the lens and retina is too great

32
Q

T/F The Crystalline Lens has 2 converging minus power surfaces

A

FALSE

33
Q 
The main function of the Choroid is: 
A-Nourishment 
B-Muscular 
C-Protection 
D-Cosmetic
A

A-Nourishment

34
Q 
The main function of the Sclera is: 
A-Nourishment 
B-Muscular 
C-Protection 
D-Cosmetic
A

C-Protection

35
Q

T/F The Fovea Centralis (macula) contains the highest percentage of cones in the retina.

A

TRUE

36
Q

T/F The “Human Seeing System consists of 2 sets of lenses, 2 sensing devices and 1 brain and is used to describe how we see.

A

TRUE

37
Q

Which optical component of the eye has the greatest dioptric power?

A

CORNEA

38
Q

All of the following changes take place during accommodation except:
A-pupil dilates
B-anterior surface of lens moves forward
C-anterior surface of lens becomes more convex
D-all of the above take place during accommodation

A

A-pupil dilates

39
Q

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

A

TRUE

40
Q

T/F Axial Myopia is nearsightedness due to a longer than average global length of the eye.

A

TRUE

41
Q 
Presbyopia can be corrected by all of the following except: 
A-refractive surgery 
B-multifocals 
C-reading glasses 
D-plus lenses
A

A-refractive surgery

42
Q 
Hyperopia can cause all of the following except: 
A-asthenopia 
B-headaches 
C-esophoria 
D-lazy eye 
E-exophoria
A

E-exophoria

43
Q

T/F Exophoria is a tendency for the eyes to turn in.

A

FALSE

44
Q

T/F The myope can improve visual acuity by accommodating for the object to be viewed

A

FALSE

45
Q

T/F Astigmatism is a refractive condition in which the eye’s optical system is incapable of forming a point image for a point object

A

TRUE

46
Q

T/F An uncorrected myope has good visual acuity at distance but poor visual acuity at near.

A

FALSE

47
Q

T/F Corneal Hyperopia is a refractive error in which the cornea of the eye is too steep.

A

FALSE

48
Q

T/F Presbyopia is caused by a decreased functioning of the crystalline lens in the eye.

A

TRUE

49
Q 
The condition in which a client diagnosed with presbyopia sees clearly in the distance while looking through their reading prescription is known as: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_. 
A-Axial Presbyopia 
B-Latent Presbyopia 
C-Axial Hyperopia 
D-Latent Hyperopia
A

D-Latent Hyperopia

50
Q 
An uncorrected myope \_\_\_\_\_\_\_\_\_accommodates and leans towards \_\_\_ phoria. 
A-over/exo 
B-over/eso 
C-under/exo 
D-under/eso
A

C-under/exo

51
Q 
An uncorrected hyperope \_\_\_\_\_\_\_\_\_\_accommodates and leans towards \_\_\_\_\_\_\_ phoria. 
A-over/exo 
B-over/eso 
C-under/exo 
D-under/eso
A

B-over/eso

52
Q

T/F A person cannot have both hyperopia and astigmatism in a presbyopic correction.

A

FALSE

53
Q

T/F An astigmatic eye could focus light rays both in front of and behind the retina.

A

TRUE

54
Q

T/F The optical image is the image actually formed on the retina, while the retinal image is the actual image formed by the eye’s optical system.

A

FALSE

OPT-2375 Refractometry Theory I (1 decks)

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