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Theory Fall 2020 > BIO I > Flashcards

BIO I Flashcards

1
Q

What kind of image are you viewing when doing BIO?

A

Real, arial located between Dr and condensing lens, inverted and reversed.

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2
Q

Prism in the BIO reduces PD to

A

15mm.

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3
Q

Why might you use lower powers (12 or 16D)?

A

Lower power, higher mag, less field.

Posterior pole and optic disc eval.

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4
Q

Why might you use medium powers (18 to 25D)?

A

General purpose. Periphery. Mid mag and field of view.

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5
Q

Why might you use high powers? (30 to 40D)?

A

Higher power, lower mag, greater field of view.

Poor dilation, media opacities, poor fixation, ora

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6
Q

20D.
Focal length
Mag
FOV

A

5cm
2.97x
46 degrees. 9 DD

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7
Q

Working distance

A

Focal length of lens. Distance from condensing lens to patients eye.

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8
Q

How to calculate mag of a lens

A

Eye power/lens power.

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9
Q

Why might you use cobalt blue filter

A

Autofluorescence of optic disc. Used with fluorescent dye.

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10
Q

Why might you use red free filter

A

Enhance ocular blood vessels, hemorrhages. Differentiate between retinal and choroidal lesions.

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11
Q

Why might you use diffuser filter?

A

Decreases light intensity

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12
Q

Why might you use yellow filter?

A

Increased patient comfort
Blocks blue light and UV
Can alter retinal color

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13
Q

Why you should not dim lights in exam room too much before BIO?

A

Pt will dark adapt, BIO light will feel extra bright.

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14
Q

How to check alignment

A

Use purkinje images to ensure proper alignment. Align images with each other.

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15
Q

Brightness on BIO for DFE

A

Light at 60% for pt compliance.

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16
Q

Order of retinal examination with BIO?

A 
Periphery first (systematically). As pt looks in secondary gazes, the examiner will move opposite from quadrant to be viewed.
Posterior pole last. ON, macula, and vessel arcades. Decrease brightness. Examine left eye as patient looks at your left ear.
17
Q

When to caution using BIO (bright lights) on patients?

A

Can effect migraine and seizure pts

18
Q

ANSI standards. Risk of damage from light

A

More than 40 seconds of continuous exposure can cause damage

19
Q

How to alter BIO if person has retinal disease?

A

They might have a lower tolerance to light and you will need to decrease exposure

20
Q

At risk adult

A

Patient with diabetes, HTN, family history of ocular disease. Clinical findings that increase risk- had surgery, contact lenses, drugs with ocular side effects, hazardous occupation to eyes.

21
Q

At risk child

A 
Prematurity, low birth rate
Family history of retinoblastoma, congenital cataracts
High refractive error 
Strab 
Anisometropia

Theory Fall 2020 (13 decks)

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