Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

DOPT Theory 1100 > Definitions PT1/2 > Flashcards

Definitions PT1/2 Flashcards

1
Q

Emmetropia

A

a normal eye with no refractive error

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Ametropia

A

an eye abnormality (hyperopia, myopia and astigmatism) resulting from a faulty refractive ability of the eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Presbyopia

A

farsightedness caused by loss of elasticity of the lens of the eye, occurring typically in middle and old age

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Hyperopia

A

AKA farsightedness.
Distant light rays of light focus behind the retina when the eye is at rest.
Plus lens is used for correction.
Causes: short axial length, flatter than normal corneal curvature, smaller eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Latent

A

hyperopic error that can be corrected by the eye’s accommodation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Manifest

A

hyperopic error that can be corrected by either plus lenses or by the patient’s own accommodation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Absolute hyperopia

A

hyperopic error that is not compensated for by accommodation (needs corrective lenses)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Myopia

A

AKA nearsightedness.
Parallel light rays of light focus in front of the retina when the eye is at rest.
Minus lens is used for correction.
Causes: steeper than normal cornea, a longer than normal eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Axial myopia

A

eyeball is too long for the normal refractive power of the lens and cornea

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Curvature myopia

A

eye is of normal size but the curvatures of the cornea and lens are steeper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Index myopia

A

change in the index of refraction of the lens (cataracts or diabetes can cause); requires minus lens to compensate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Astigmatism

A

condition where light rays are not refracted equally in all directions, so a focus point on the retina is not attained

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Regular astigmatism

A

correctable by spherocylinder lenses and the principal meridians are at right angles to each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Simple (astigmatism)

A

one of the focal lines always falls on the retina, the other falls in front (myopic) or behind (hyperopic) it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Compound (astigmatism)

A

both focal points lie either in front (myopic) of the retina or behind (hyperopic) it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Mixed astigmatism

A

one focal point lies behind the retina, whereas the other focal point lines in front of it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Irregular astigmatism

A

the surface of the cornea is not smooth (irregular) and therefore light rays do not refract in a predictable way to a single point.
Causes: trauma, inflammation and/or scar tissue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Outer coat

A

cornea, sclera and limbus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Middle coat

A

uvea, which consists of iris, ciliary body (ciliary muscles and ciliary processes) and choroid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Inner coat

A

retina, optic nerve and optic disc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Outer lipid layer

A

prevents evaporation of aqueous layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Aqueous layer

A

provides nutrition and defense

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Inner mucoid layer

A

keeps tear film on the epithelium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Focal power formula

A

P=1/f

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Pupillary distance

A

distance between the centers of each pupil in each eye. Determines where to put the optical center in each lens

26
Q

COBC Code of Ethics

A 
General
Duty to the public
Duty to clients
Duty to the profession 
Duty to colleagues
27
Q

General

A

honest and knowledgeable, improve clients well being

28
Q

Duty to the public

A

educating the public in promotion of ophthalmic health

29
Q

Duty to clients

A

confidentiality, maintain records

30
Q

Duty to the profession

A

don’t warrantee or guarantee success of care or treatment

31
Q

Duty to colleagues

A

don’t compete for clients, compare professional competence

32
Q

Three regulatory documents

A

HPA Opticians Regulation
Standard of Practice
Code of Ethics

33
Q

Local optician association

A

(OABC) Opticians Association of BC

34
Q

National optician association

A

(OAC) Opticians Association of Canada

35
Q

What do the national opticians association do?

A

OAC looks out for the interest of opticians

36
Q

Authorization document

A

Rx for glasses or an assessment record

37
Q

Assessment record

A

record produced by an independent automated refraction

38
Q

Prescription

A

authorization to dispense a vision appliance

39
Q

Automated refraction

A

refraction for assessing visual acuity, using computerized components

40
Q

Independent automated refraction

A

automated refraction conducted without the involvement of a prescriber

41
Q

Eye examination

A

includes both eye health assessment and refractive error assessment, conducted by an optometrist or ophthalmologist

42
Q

Refraction

A

when light travels from one medium into another the path of light ray will be diverted

43
Q

Reflection

A

when light changes direction as result of “bouncing off” a surface like a mirror

44
Q

Index of refraction (RI) formula

A

RI = Speed of light in air / speed of light in new substance

45
Q

What are the units for focal length?

A

Unit is in Metres

46
Q

What are the units for power?

A

Unit is in Diopters

47
Q

The visible spectrum is only a small part of the larger ____ spectrum.

A

Electromagnetic

48
Q

A wavelength is measured from ______.

A

Crest to crest

49
Q

Parts of a wavelength

A

Crest = top /\
trough = bottom \/
wavelength measured = crest to crest
amplitude measured = crest to trough

50
Q

Prism bends light towards ___

A

the base

51
Q

Prism displaces image towards ___

A

the apex

52
Q

Meibomian

A

eyelid glands that create the lipid layer of the tear film

53
Q

Horizontal Visible Iris Diameter

A

Size of the average iris (~12mm)

Size of the average eye (~24mm)

54
Q

Lid margin

A

flat part of the lid that meet when your eyes blink

55
Q

Caruncle

A

sweat and oil glands for the tears

56
Q

Plica semilunaris

A

fleshy tissue beneath the caruncle

57
Q

Palpebral Fissure

A

distance between the upper and lower lids

58
Q

3 tear film functions

A
  1. forms a smooth refractive optical surface
  2. maintains a moist environment of the epithelium
  3. carries oxygen to the eye
59
Q

5 steps that tear flow

A
  1. secretions from the lacrimal, meibomian and conjunctival goblet cells are distributed onto the cornea
  2. secretions separate to form the 3-tier film layer
  3. With each blink, tears are directed towards the nasal canthus and into the puncta
  4. Afterwards, tears flow through the canaliculi to the lacrimal sac
  5. tears drain through the nasolacrimal duct and into your nose
60
Q

5 angle structures for proper aqueous humor outflow to prevent glaucoma

A
  1. root of the iris
  2. ciliary body
  3. scleral spur
  4. Schlemm’s Canal
  5. Trabecular Meshwork
61
Q

Standards of Practice guidelines DO

A
  • represent COBC view of what “good practice” means
  • serve as a guide as to the scope of services that the optician can provide
  • represent what a competent optician is able to do in practical and achievable terms
62
Q

Standards of Practice guidelines DO NOT

A
  • constitute a checklist of clinical or professional procedures that must be performed
  • indicate what opticians must do in a given set of circumstances

DOPT Theory 1100 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions