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Ncle Practical > Knowledge > Flashcards

Knowledge Flashcards

1
Q

Spherical RGP lenses on against-the rule corneas tend to decenter…

A

laterally

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2
Q

by increasing the overall lens
diameter, increasing the size of the
optic zone or steepening the base
curve of the lens does this to an RGP lens

A

Steepens the lens to cornea relationship

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3
Q

A lens that has become adherent
to the cornea may leave an
impression that can be viewed
after the lens has been removed.

A

leaves slightly darker spot

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4
Q

Neovascularization of the cornea in a soft contact lens could indicate …

A

A lack of oxygen transmission through the lens, a tightly fitting soft lens or a situation in which the patient overwears

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5
Q

edge stand off or lift can occur

A

when soft contact is fit too flat to the cornea

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6
Q

Soft lens should be …mm larger than the patient’s HVID

A

2
Hvid= 11-12
diameter should be = 14ish

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7
Q

The difference between Neovascularization and Pannus is…

A

Neovascularization: develops in an already compromised cornea
Pannus: caused by ill fit, typically at superior limbus.

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8
Q

Is chalazion or stye (hordeolum) usually above the eye and a raised lump

A

Chalazion

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9
Q

Is chalazion or stye (hordeolum) a point/ pimple on lash line usually below eye

A

Stye

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10
Q

When Superficial Punctate Keratitis has an isolated pattern this is because…

A

there is a poor contact lens fit or infection

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11
Q

When Superficial Punctate Keratitis has a diffuse pattern this is because …

A

There may be solution toxicity or an interaction between certain lens/solution combinations or dry eye syndrome.

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12
Q

Steepest on 90 flattest on 180

A

With the rule astigmatism

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13
Q

a rigid lens will ride superior-inferior with the interaction of the eyelids during a blink

A

With the rule astigmatism

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14
Q

will tend to ride medial-lateral

A

Against the rule

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15
Q

inconsistent with the blinking action of the eyelids

A

Against the rule

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16
Q

Keratometer measures … after surgery

A

low

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17
Q

Average keratometer measurement is …

A

47-48

18
Q

Above-average keratometer measurement means keratoconus

A

(52) (51)

19
Q

Contact inverted and not inverted looks like

A

Inverted flares out at top and bottom more angular

correct way has rounded edges and bottom

20
Q

Normal Tbut

A

greater than 10 seconds

21
Q

Schrimer test 1

A

After 5 mins
Normal-greater than 15mm
Mild-10-14mm
Moderate- 5-9mm
Severe- less than 5mm

No drops
small strips of filter paper inside the lower eyelid

22
Q

Schirmer test #2

A

Less than 6mm of wetting after 5 mins is abnormal

Anaesthetic drops used

A cotton swab inserted into the nose

23
Q

Marginal Tbut

A

greater than 5 and less than 10

24
Q

Low Tbut

A

Less than 5 seconds = dry eye symptoms

25
Q

ptosis

A

Upper eyelid droops below normal position

26
Q

trichiasis

A

eyelashes grow inwards toward the eye

27
Q

Ectropion

A

Droop of the lower lid

28
Q

lagophthalmos

A

incomplete closure of the eyelids

29
Q

Entropion

A

turning inward of the eyelid making eyelashes touch globe

30
Q

The deeper the layer of tears the … the fluorescein green will be.

A

brighter

31
Q

The less tears in the tear layer the … the fluorescein green will be

A

darker

32
Q

Before insertion scleral lenses are washed down with … and filled with …

A

saline solution

33
Q

Involuntary, jerking movements of the eyes

A

nystagmus

34
Q

Central Abrasion

A

This stain is caused by a large break or erosion in the corneal epithelium.

Can be caused by a flat lens or other mechanical irritation or extended corneal edema.

Pic:book

35
Q

Peripheral abrasions

A

Caused by mechanical irritation or chipped/damaged lens. Could be poor insertion or removal techniques.

Pic:book

36
Q

3-9 o’clock staining

A

Caused include poor blinking/incomplete blink, flat edge curves, and poor edge design(thick edge)

Dry tear film breakdown

37
Q

Arcuate

A

Due to poor blends or peripheral curves

38
Q

Dimple veil staining

A

Caused by air bubbles that have been trapped centrally under the lens due to a poor fit that is too steep, or in the limbal area by a lens that is too flat.

It is not a breakage but rather a denting of the surface of the epithelium

39
Q

Stippling/punctate stains

A

Caused from dryness, lack of oxygen to cornea, associated with PMMA lenses, but can also be found in dirty gp lenses or low Dk gp lenses.

Chemical toxicity can also contribute

40
Q

Solution induced corneal staining

A

Small dots around entire surface or in periphery caused by solution toxicity/insensitivity

Ncle Practical (3 decks)

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