Equipment Maintenance and Calibration 1% Flashcards
Any equipment with a ________you should use all day without recharging you between use
rechargeable battery
Why shouldn’t rechargeable batteries be charged between each use?
Because rechargeable batteries have a memory and if you constantly recharge the battery it never will develop much of a memory.
You should keep a record book of your ________(can be as simple as a spiral notebook)
equipment maintenance and calibration checks(should include serial number of the equipment because equipment gets moved from room to room)
____instruments when not in use.
Cover or store(in a container) and turn off
Why is it important to cover or store instruments?
Because many of the instruments have mirrors and they are dust magnets.
Anything that makes contact with a patient should be….
cleaned, disinfected, or sterilize depending on how it comes into contact with the pt.
Equipment that is painted metal, plastic, or vinyl should be…
dusted with a soft cloth
dry cloth or with spray cleaner(if spray cleaner, spray on cloth not instrument) and use all solutions sparingly
Crevices can be cleaned with ….
canned air or cotton tip applicators
Why must you not tilt canned air?
Because a cold moist liquid will come out instead of air and this will make plastics milky white
Why is it important to turn equipment off in between use?
Because they get hot and they need to cool down
When changing bulbs…..
Turn off equipment, unplug, and wait for bulb to cool, handle it with a bulb jacket or tissue.
If bulbs have corrosion….
unplug equipment and scrape off with eraser or file, then blow it out.
Why should you not touch the bulbs?
because oil from fingers get on it and shorten the life of the bulb and create shadows in the illumination field and it also protects you in case the bulb breaks
Some bulbs don’t blow they instead _________
diminish in illumination
Some bulbs can be rotated ____degrees to extend their life
(The Goldman perimeter is one that has a bulb that should be rotated periodically)
180
If you have a shadow or decrease in you illumination field for projector you should…..
-check the bulb(may be over heated, may not be rotated properly, may need replaced, contact may be corroded)
-maybe housing mirror is out of alignment
-maybe the lens or optics in it need cleaned
The housing mirror in the projector is adjacent to the ____and is easy to knock out of position
bulb
What is the formula for calibrating a projector?
RF distance in ft. to screen(the distance from pt eye to the mirror to the silver screen behind them) x 4.5mm=height of 20/200 letter in mm on reflecting screen
Other than formula what can be used to calibrate a projector and how is it done?
“a chart bracket”
( a piece of paper that you can get from the equipment manufacturer)
first measure RF in feet, then take the chart bracket and hold on the silver screen, a second person is at the projector moving the projector tube in and out to change the size of the 20/200 letter and to change the focus of it. If RF is 16’ your 20/200 letter should be the size of the preprinted E. If RF is 14’ yours 20/200 should be the size of the bracket just above the number 14
Calibrating projector:
20’ chart should be ____from pt(infinity)
10’ chart should be ___from pt
20’
10’
Calibrating a projector;
If room is not 20’ then you use 2___surface mirrors or a screen
front
Calibrating a projector:
Measure distance between pt and ______
reflecting screen
What should you clean projector slide with?
soft dry cloth
(do not touch, never use any liquid)
Projector slides have___glass plates with the symbols between them
2
If you use liquid on the projector slides it will….
distort and ruin the symbols
We use ___surface mirrors to check VA because they reflect 100% of the light.
front
Front surface mirrors are called this because the ….
mirror is literally on the front
Frequent wiping will____the reflectivity so you only clean them when they are ______
erode
visibly dirty
What do you clean front surface mirrors with?
canned air, a camel hair brush, or a 1:4 soln of ether dragged across a lint free cloth.
How can you tell if a mirror is a front surface mirror?
Pencil tip touches its reflection
How can you tell if a mirror is a back surface mirror?
It will show some space between the pencil and its reflection
How do you clean back surface mirrors
any household cleaner(just like mirrors at home)
Frequent rubbing or chemicals can on trial lenses will…
cause the painted numbers to rub off
How should you clean trial lenses?
With wens wipes or lint free cloth or glass cleaner
You should keep trial frames covered to keep them__
dust free
Be careful not to drop or jar trial frames because they can…
come out of alignment easily.
What should you use to clean trial frames?
alcohol or damp cloth
Cross cylinders should be cleaned with…..
Damp cloth
Vigorous rubbing on the cross cylinder can cause ….
Harsh cleaners can…
loosened lenses and rotate lens
rub off dots.
____are special lenses that have and antireflective coating on them
bloomed lenses
Phoropter lenses are ___
bloomed
How do you clean bloomed lenses (phoropter lenses?
with 100% ethyl or methyl alcohol on lens wipe
(never wipe dry)
Glass lenses lenses should be cleaned with
glass cleaner
Plastic should be cleaned with
contact lens cleaner
Most prism bars or loose prislms are made of ____
acrylic
What should you clean prism bar or loose prism with?
soft lint free cloth
(keep them in a case)
Why should you not use alcohol or other solutions on prism bar or loose prisms?
because they will fog lenses and turn them white
Why should you store unused phoropter at zero and open and?
Because it protects the lenses in the body of the unit.
Should also cover with dust cover at night.
You should ____ never touch the lenses of the phoropter
never
What should you clean the face shield of the phoropter with?
alcohol, soap and water, or sterilize in autoclave
Phoropters should be professionally cleaned every ____ or you can do it yourself.
1-2 years
Be careful not to get any ___ in auto refractor.
liquid
If the measuring window of the auto refractor gets dusty it can…
affect the accuracy of findings
Auto refractor measuring lens should be cleaned with…
canned air or lens wipe
You can clean forehead rest, chin rest, and face shield of auto refractor with…
alcohol
Auto refractor is ___voltage and should be treated as other computers, do not ____. Make sure thermal paper is installed ____
disassemble
correct side up
The retinoscope, transilluminator, and direct ophthalmoscope are all maintained by…
Leave out of charger during daily use to discharge battery
Turn off after use
Bulbs will blow if transformer is set too high
You should keep the ophthalmoscope viewing lens set at ____to keep lenses clean
zero
How do you get the bulb in and out of a Copeland?
push/pull lamp, do not twist-will ruin base
With Welch Allyn the bulb____ and you remove by ___
slides into head
gently flipping with screwdriver
How do you clean the lensometer?
with canned air or camel hair brush and eye piece with lens cloth
Must ___lensmeter in between use
turn off
Marking device can get gunked up with ink, clean with
and alcohol pad
____may need reinked or replaced
ink pad
How do you check to see if lensmeter is in calibration?
by reading some trial lenses from one of trial sets
If lesmeter needs calibrated it should be done by____
returned to factory for service
Automatic lensometer is a ____processor
micro
If fluid gets into the auto lensometer it will…
damage it
___device on auto lensometer may need replaced or reinked
marking device
Marking pens on auto lensometer can be cleaned with
alcohol wipe
Replace nose piece cover of auto lensmeter if..
(pry loose with a screwdriver and attach new piece)
it is torn or abraded
Check calibration of auto lensmeter with ___ and sent to ___if needs recalibrated
trial lenses
factory
Lens of indirect ophthalmoscope should be cleaned with..
canned air or alcohol
Indirect ophthalmoscope has a __surface mirror
front
Band on the head of indirect ophthalmoscope can be cleaned with…
soap and water or alcohol
Indirect ophthalmoscope should be stored by…
hanging on hanger or in a case
Where is the bulb located in the indirect ophthalmoscope
in the bulb connector next to the core connector
facts about Bulb of indirect ophthalmoscope….
-located in bulb connector next to cord connector
-pull cord connector out and unscrew bulb connector
-bulb will fall out
-check bulb contacts and clean if necessary
slit lamp should be ___when it is not in use
locked and turned off
if chin rest of slit lamp is made of plastic it can be cleaned with ___ but if is made of rubber don’t use because it will turn it white
alcohol
Slit lamp should be cleaned with..
canned air, camel hair brush, or dust with soft lint free cloth
Slit lamp mirror is a ___surface mirror. To clean grasp both sides of the mirror and gently____ and clean with a _____
front
pull straight out
lens wipe
The gliding plate of the slit lamp needs its ball bearing tracks cleaned ____
1-2x per year with alcohol
Slit lamp: Every __cleanings of he gliding plate you should lubricate it with ___ to condition it and prevent cracking and keep SL moving smoothly.
5
WD-40
How do you extend the life of slit lamp bulb?
by using lowest voltage setting and turning off between use
The corneal topographer cone is painted with a___ . It absorbs the oils in your fingers and will scratch easily so keep hands off and keep covered with a dust cover.
special white reflected paint
____dust corneal topographer cone but never use _____. Clean chin and forehead rest with____
Lightly
alcohol or harsh detergents
alcohol
When should Topography unit be calibrated?
When it is initially set up, when moved, and at least monthly
How do you check calibration of topography unit?
with a calibration object mounted and then capture a series of images(unit will advise if calibration needed)
Topography unit: verify and recalibrate every __years by ___ or ____ or ____
q 2 years
manufacturer or certified measuring lab or according to manufacturer’s instructions
Biometry instrument calibration should be checked___
daily before using on pts
To calibrate biometry instruments…
use a clean test eye, perform all the tests, ensure results are within tolerance range given for test eye, if not take instrument out of service and contact manufacturer’s service dept
How should front surface mirror that surrounds the bulb of keratometer be cleaned?
with canned air or camel hair brush
Sliding pate of Keratometer requires no maintenance because…
it has permanent grease applied at factory
What maintenance does keratometer require?
cleaning mirror, changing bulb, and calibration
What is used to check calibration of keratometer?
3 steel balls with a known radii
Explain how to calibrate keratometer?
Mount test sphere on magnetic holder, focus eye piece, measure them.
How often should calibration be checked with keratometer?
every 2 mos
If readings aren’t accurate when checking calibration of keratometer….
send for recalibration
What should pachymeter probe be cleaned with
alcohol between pts or gas sterilize it with ethylene oxide (EO gas), or used chemicals (cold sterilization) but do not autoclave
Be careful with probe of pachymeter-do not jar or drop it and store in…
a case
It stimulus on automated visual field machine had blurred edges you need to ….
send for servicwe
Disk drives of automated visual field machine needs to be cleaned at least___
3 x per year with a drive cleaner moistened with alcohol
Tape heads of the automated visual field machine needs to be….
cleaned periodically with tape cartridge that has cleaning pad, cleaning solution and arm for moving cleaning pad across the head. Apply a few drops of cleaning soln to pad and insert into drive, move handle up and down to clean entire head surface, resume normal operation
Bowl type perimeters have a special ___
This absorbs oil from fingers and scratches easily.
white reflectance paint
How do you clean a bowl type perimeter
with canned air, camel hair brush, or Extran MA O2 Neutral (soln form MERCK)
The ____ perimeter has a projector arm with 2 ball joints that need lubricated__x per year
Goldmann perimeter
2
When replacing the lamp housing of goldmann perimeter make sure you align the ___
red marks
Clean lamp housing of goldmann perimeter with…
canned air or remove and clean with soft cloth
Bulb of Goldmann perimeter must be roatated …..
180 degrees q 1 wk or after 20-30 hrs of use.
When should you replace the bulb and calibrated the Golmann perimeter?
Replace bulb when neither side achieves 1000 asb and recalibrate machine after replacing bulb
A ___is used to check the calibration of a Goldmann tonometer
Calibration bar
Goldmann tonometer is calibrated at ____ and should be logged in log book with date, tonometer serial number and whether the tonometer was calibrated
0, 20, 60
have a set routine to check such as every 3 mos
How many marks are on the Goldmann tonometer calibration bar and what do each of them represent?
Each has 5 markings which correspond to the 3 pressures at which you check calibration
middle mark = 0
marking on either side of”0” =20
Outer most markings =60
To calibrate tonometer: If tonometer point up…
If tonometer hang down….
-place the longer end of the calibration bar toward the examiner
-Place the longer end of the calibration bar toward the pt
Explain how to check calibration of Goldmann tonometer
put tonometry probe into position as if going to measure eye pressure, now move the tonometer knob and note the pressure at which the tonometer tip tilts forward.
If it tilts when the knob is dialed to 60 the tonometer is correctly calibrated. Repeat for 0 and 20 and move calibration bar accordingly
If tonometer is not in calibration at 0, 20, and 60 then….
check and see if tonometer prism properly inserted, see if calibration bare is precisely adjusted, repeat. If repeat check still shows errors-take tonometer out of service and send for recalibration.
