BIO - Technique

Question 1

What three things must be done to obtain Informed Consent for administering drugs to a patient?

Answer 1

• Explain purpose of drug
• Explain side effects
• Patient must agree to use drug

Question 2

What three tests must be done prior to dilation?

Answer 2

• Van Herick angles
• Tonometry
• Blood Pressure

Question 3

• What is the JNC 7 Guidelines for Normal, Pre-Hypertensive, Stage 1 and Stage 2

Answer 3

Normal, < 80
Prehypertensive 120-139 or 80-89
Stage 1: 140-159 or 90-99
Stage 2: >= 160 or >= 100

Question 4

What four structures can BIO provide a stereo-scopic high resolution view of?

Answer 4

• Vitreous
• Posterior Pole
• Equatorial retina
• Peripheral retina

Question 5

The larger the dioptic power of the lens the larger the field of view and the smaller the magnification. TRUE/FALSE

Answer 5

• TRUE

Question 6

Which lens would give the greatest magnification?

A. 15 D
B. 20 D
C. 30 D

Answer 6

A. 15 D

Larger dioptic power = Larger FOV, Smaller Mag. Therefore want smaller dioptic power.

Question 7

If a patient dilates poorly (small pupils) which lens would be best to use?

A. 15 D
B. 20 D
C. 30 D

Answer 7

C. 30 D

Want lens with largest FOV, therefore highest dioptic power.

Question 8

What are the image properties using the condensing lens?

Real/Virtual, Magnified/Minified, Reverse/Normal, Inverted/Upright, Where is it located?

Answer 8

• Real
• Maginified
• Reversed
• Inverted
• Between examiner and condensing lens

Question 9

Where should you ask the patient to fix their gaze if you want to look at a particular quandrant? (i.e. if you want to look at superior retina)

Answer 9

• Have them view the direction you want to view.

i. e. Superior view, ask patient to look up

Question 10

If you have a view and lost it what steps should you take to regain the view?

(Where do you move to lens, what do you do with the red reflex?)

Answer 10

• Move lens towards patient
• Locate red reflex and center with lens
• pull lens up again

Question 11

What are the four advantages of BIO?

Answer 11

• Stereopsis
• Large Field of View
• Bright Illumination of retina
• Minimal Peripheral retinal distortion

Question 12

What are five disadvantages of BIO?

Answer 12

• Pupil dilation required
• Patient discomfort secondary to glare
• Image is inverted/reversed
• Lens Magnification
• Initial learning curve with skill

Question 13

How do you remove unwanted reflections?

Answer 13

• Slightly tilt lens

Question 14

How do you remove black crescents in periphery of lens?

Answer 14

• recheck alignment of whole system
• align reflections on front and back of lens
• ensure condensing lens is at proper working distance

Question 15

How do you correct for unstable views?

Answer 15

• Keep reflections centered and aligned as condensing lens is pulled away
• Rest fingers on patient to stabilize
• Maintain lens at proper angle

Question 16

How do you correct for fuzzy views?

Answer 16

• May need to remove +2.00
• Consider work up for Accomodative Excess or Convergence Insuffiency
• Clean condensing lens

Question 17

How do you correct for diplopia?

Answer 17

• Check and readjust PD