Blue 4 Flashcards

1
Q

What is the Frisby test

A

3 clear plastic plates of different thicknesses
Four squares with on hidden circle

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2
Q

What range does TNO test cover

A

480-60 seconds of arc

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3
Q

What is the effective power of the lens?

A

18-20D

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4
Q

When can rigid contact lenses cause a halo effect?

A

Pupil is dilated
Due to rereaction of the peripheral lens or adjacent tear film

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5
Q

In standard loupe where is object

A

Between first principal foxus and lens

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6
Q

What level of magnification of indirect ophthalmoscopy with 13D lens? 20D lense?

A

13D - 5x
20D - 3x

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7
Q

When does US pachymetry provide a reading

A

When probe is perpendicular to posterior corneal surface

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8
Q

EOM developement weeks

A

Week 5 - SR LPS, LR

Week 6 - SO, MR

Week 7 - IO, IR

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9
Q

Order of drainage through lacrimal system

A

Pucta
Superior and inferior lacrimal canaliculi
Common canaliculus
Nasolacrimal sac
Nasolacirmal duct
Plica lacrimalis

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10
Q

How many layers of conreal epithelium

A

4-6

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11
Q

How frequent is corneal epithelial turn over

A

7-10 days

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12
Q

What is Wieger’s ligament

A

Attachment of vitreous to the lens

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13
Q

What is cloquet’s canal

A

Perivascular sheath for the fetal hyaloid artery

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14
Q

What absorbs light energy and ascorbate?

A

Carotenoids - lutein and zeaxanthing

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15
Q

Which respiratory groups are responsible for inspiration and expiration

A

Dorsal - inspiration BACK IN

Ventral - expiration - Front push out

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16
Q

What % of aq outflow via uveoscleral

A

40%

17
Q

Where do basal linear deposits occur

A

Between RPE basement membrane and RPE cell cytoplasm

18
Q

What are RF for primary closed angle glaucoma?

A

Advancing age
Female
FHx
Hypermetropia
Shallow AC
Short axial length
AP thickening of lens

19
Q

What is Cogan’s microcystic dystrophy

A

Degeneraiton of cells with cyst formation causing unstable corneal epithelium

20
Q

What are flexner Wintersteiner rosettes?

Horner Wright rosettes

Fleurettes

A

Crcle of cells limited internally by continuous membrane

HW - multilayered circle of nuclei surroudning eosinophilic fibrillate material with no limen or ILM

Fleurettes - primitive photoreceptor bodies fleur de lys shape

21
Q

What do exoenzymes do?

A

INhibit ROS production

22
Q

Which immune cells possess many mitochondria

A

Basophils

23
Q

How mcuh does intracellular calcium consititue?

A

1% total body claclium

99% in bones/teeth

24
Q

Which eicosanoid causes vasodilation?

A

PgE2 and PgI2

Leucotrienes and thromboxanes cause vasoconstriction

25
Q

Visual field angles

A

50 superior
60 nasal
70 inferior
90 temporal

26
Q

What cnoditions reduce a and b waves?

A

ROD cone dystrophies
RP
Ophthalmic artery occlusion
Drug toxicity
Cancer assocaited retinoapthy
RD
Autoimmune retinoapthy
Metallosis

ROD CRAM