Chapter 4- Equipment Maintenance And Repair

Question 1

Which of the following will help prevent dust build-up on the lenses of a direct ophthalmoscope?
a) the direct ophthalmoscope has no built-in lenses
b) cleaning daily with cleanser
c) removing the instrument facing for direct access to the lenses
d) storing the instrument with the lens setting on zero

Answer 1

D-storing the instrument with the lens

Question 2

Which of the following is not appropriate when cleaning an indirect ophthalmoscope?
a) cleaning the front surface mirror with a brush
b) rubbing debris off the bulb with the finger
c) cleaning the bulb contacts by scraping with a file
d) wiping the headband with an alcohol wipe

Answer 2

B- rubbing debris off the bulb with the finger

Question 3

Dirty tangent screen test objects should be cleaned with:
a) cleanser
b) an alcohol wipe
c) soap and water
d) acetone

Answer 3

C-soap and water

Question 4

The tangent screen itself can be cleaned:
a) by gentle whisking with a very soft brush
b) by brushing with a wire brush
c) with a commercial dry-cleaning product
d) with soap and water

Answer 4

A- by gentle whisking with a very soft brush

Question 5

To prevent dirt from collecting on the back surface of the refractor/phoroptor lenses:
a) use the widest pupillary distance possible
b) adjust the forehead rest to avoid lash/lens contact
c) make sure the refractor is level
d) request that patients remove mascara before refractometry

Answer 5

B- adjust the forehead rest to avoid lash/lens contact

Question 6

All of the following tend to loosen the glue of a mounted lens except:
a) drying out over time
b) heat
c) cool water
d) alcohol or acetone

Answer 6

D- alcohol or acetone

Question 7

Which of the following will remove the coating on a bloomed lens (such as the indirect ophthalmoscope lens)?
a) gently wiping the dry lens with a tissue
b) wiping the lens with ethyl or methyl alcohol
c) blowing the lens with compressed air
d) heavily rubbing the lens to remove fingerprints

Answer 7

D- heavily rubbing the lens to remove fingerprints

Question 8

The best way to remove dust from a fundus camera lens is to first:
a) dust it with a camel’s hair brush
b) blow off dust with air
c) wipe dust off with a dry cloth
d) clean dust off with isopropyl alcohol

Answer 8

B- blow off dust with air

Question 9

Which of the following is untrue regarding front surface mirrors?
a) The silver coating can be rubbed off over time.
b) The coating can be scratched by mishandling.
c) They produce a faint double image of the reflection.
d) They reflect 100% light transmission.

Answer 9

C- they produce a faint double image of the reflection

Question 10

Prior to cleaning a front surface mirror, one should:
a) rub with a cotton ball to remove loose dust
b) use canned air to remove loose dust
c) blow on it to remove loose dust
d) spray it with water

Answer 10

B- use canned air to remove loose dust

Question 11

A projector screen is cleaned by:
a) wiping with an alcohol wipe
b) scrubbing with cleanser
c) a solution of mild detergent
d) commercial glass cleaner

Answer 11

C- a solution of mild detergent

Question 12

To extend the life of a slit-lamp bulb:
a) use the lowest voltage setting as much as possible
b) scrape the contact points weekly
c) turn it 180 degrees weekly
d) use the lowest illumination as much as possible

Answer 12

A- use the lowest voltage setting as much as possible

Question 13

If the light in a piece of electrical equipment begins to flicker or does not come on, the first and easiest thing to check is:
a) the filament
b) the bulb’s seating
c) the instrument’s plug
d) the instrument’s fuse

Answer 13

C- the instruments plug

Question 14

If the bulb contacts become corroded, one may remedy this problem by unplugging the instrument and:
a) replacing the contacts
b) wiping the contacts with alcohol
c) scraping with a metal file
d) blowing with compressed air

Answer 14

C- scraping with a metal file

Question 15

The projector bulb has a build-up of oxidation on one side, decreasing its illumination. You should:
a) replace the bulb
b) turn the bulb 180 degrees to use the other side (without the build-up)
c) remember that nothing needs to be done as long as all patients are checked in the same illumination
d) scrape off the contacts in the bulb housing

Answer 15

B- turn the bulb 180 degrees to use the other side (without the build-up)

Question 16

Which is true of rechargeable batteries and recharging units?
a) the battery will last 10 years or more
b) the rechargers cannot be left on indefinitely
c) batteries can lose the ability to recharge
d) all batteries can be installed in either direction

Answer 16

C- batteries can lose the ability to recharge

Question 17

One might adjust the concave mirror in an acuity projector in order to:
a) change the size of the letters to fit a shorter room
b) increase the clarity of the letters
c) improve faulty illumination
d) change the place where the target is projected

Answer 17

C- improve faulty illumination

Question 18

To calibrate the size of the target of an acuity projector, one must:
a) have a 20-foot test distance
b) use a template and adjust the projection tube until the letter fits into the correct bracket
c) use a table to convert every patient’s measurement if the test distance is not 20 feet
d) use a template, and adjust the concave mirror until the letter fits into the correct bracket

Answer 18

B- use a template and adjust the projection tube until the letter fits into the correct bracket

Question 19

If the vertical alignment of an indirect ophthalmoscope is misaligned:
a) adjust the headband
b) make sure the mirror is clean
c) adjust the mirror
d) have the instrument professionally serviced

Answer 19

D- have the instrument professionally serviced

Question 20

During a normal workday, when not in immediate use, the retinoscope should be stored:
a) by lying it on its side on the table mb) by leaving it turned on
c) by placing it upright
d) by lying it in a protected drawer

Answer 20

C- by placing it upright

Question 21

If the retinoscope light flickers and the bulb placement is solid, the flickering is probably due to:
a) a loose bulb filament
b) inadequate charge
c) internal wiring problems
d) weak batteries

Answer 21

C- internal wiring problems

Question 22

Which of the following is not true regarding fluid-filled ultrasound probes?
a) the membrane tip is fragile and lasts only a few days
b) the probe is filled with sterile saline solution
c) air bubbles must be removed from the probe before use
d) the crystal in the probe can lose sensitivity over time

Answer 22

B- the probe is filled with sterile saline solution

Question 23

Ultrasound units are calibrated by:
a) touching the probe to a test block specific for that machine
b) touching the probe to a flat surface c) routinely measuring the same person’s eye as a standard
d) pressing the calibration button on the instrument

Answer 23

A- touching the probe to a test block specific for the machine