CPOA CONTACT LENS AND FITTING
EXAM QUESTIONS WITH CORRECT
ANSWERS
Palpebral aperture - ANSWER The separation of the lid margins between
blinks with a normal relaxed gaze, may be measured with a mm rule or
interpupilary stick
9- to 10mm - ANSWER The average fissure size
The visible iris diameter - ANSWER The distance from the nasal limbus to the
temporal limbus and constitutes the lateral diameter of the iris
between 10.5 and 12.5 mm - ANSWER The normal iris diameter reading is
10-15 times per minute - ANSWER A blink rate of how many times is normal
With a wisp of wet sterile cotton onto the cornea from one side - ANSWER
How is corneal sensitivity measured
Long term PMMA contact lens wear - ANSWER Abnormal blink response is a
frequent manifestation of what
10-15 seconds - ANSWER Tear film should remain uniform over the corneal
surface for a minimum of how long after a normal blink
Mucoid - ANSWER A short tear film breakup time indicate s problem with
what layer of the tear film
Blue cobalt - ANSWER What light on the slit lamp is used to observe the
cornea
, True dry spots show up as black areas within the fluorescein covered corneal
surface - ANSWER What is the indicator of poor tear film quality
The number of seconds it takes for the first dry spot to appear - ANSWER
What is the important value to observe when doing a tear film analysis
6-9 seconds - ANSWER What is the borderline time for Tear film breakup
time
5 seconds or less - ANSWER Tear break up time of how long should be a
contradiction to contact lens wear
Decrease - ANSWER Will tear film breakup increase or decrease with contact
lens wear
Schirmer tear strips or Phenol Red Thread Test - ANSWER What methods are
used to measure tear quality, an adequate tear supply or quantity
15- to 20mm in 5 minutes is normal - ANSWER What is a normal reading for
Schirmer test
Less than 10mm - ANSWER What measurement with a Schrimer test is
considered indicative of dry eye
Better comfort, a shorter (15 sec) test time, greater validity and no anesthetic -
ANSWER What are the benefits of the Phenol Red Thread Test
Sodium Fluorescein - ANSWER What should the patients corneal be stained
with for the
True - ANSWER True or false? Fluorescein dye will not absorb into a PMMA
or GP lens, but can temporarily discolor a soft lens
Papillae - ANSWER Raised area on the underside of the lids
several papillae are present per millimetre of the conjunctiva - ANSWER A
uniform cobblestone appearance indicates what
EXAM QUESTIONS WITH CORRECT
ANSWERS
Palpebral aperture - ANSWER The separation of the lid margins between
blinks with a normal relaxed gaze, may be measured with a mm rule or
interpupilary stick
9- to 10mm - ANSWER The average fissure size
The visible iris diameter - ANSWER The distance from the nasal limbus to the
temporal limbus and constitutes the lateral diameter of the iris
between 10.5 and 12.5 mm - ANSWER The normal iris diameter reading is
10-15 times per minute - ANSWER A blink rate of how many times is normal
With a wisp of wet sterile cotton onto the cornea from one side - ANSWER
How is corneal sensitivity measured
Long term PMMA contact lens wear - ANSWER Abnormal blink response is a
frequent manifestation of what
10-15 seconds - ANSWER Tear film should remain uniform over the corneal
surface for a minimum of how long after a normal blink
Mucoid - ANSWER A short tear film breakup time indicate s problem with
what layer of the tear film
Blue cobalt - ANSWER What light on the slit lamp is used to observe the
cornea
, True dry spots show up as black areas within the fluorescein covered corneal
surface - ANSWER What is the indicator of poor tear film quality
The number of seconds it takes for the first dry spot to appear - ANSWER
What is the important value to observe when doing a tear film analysis
6-9 seconds - ANSWER What is the borderline time for Tear film breakup
time
5 seconds or less - ANSWER Tear break up time of how long should be a
contradiction to contact lens wear
Decrease - ANSWER Will tear film breakup increase or decrease with contact
lens wear
Schirmer tear strips or Phenol Red Thread Test - ANSWER What methods are
used to measure tear quality, an adequate tear supply or quantity
15- to 20mm in 5 minutes is normal - ANSWER What is a normal reading for
Schirmer test
Less than 10mm - ANSWER What measurement with a Schrimer test is
considered indicative of dry eye
Better comfort, a shorter (15 sec) test time, greater validity and no anesthetic -
ANSWER What are the benefits of the Phenol Red Thread Test
Sodium Fluorescein - ANSWER What should the patients corneal be stained
with for the
True - ANSWER True or false? Fluorescein dye will not absorb into a PMMA
or GP lens, but can temporarily discolor a soft lens
Papillae - ANSWER Raised area on the underside of the lids
several papillae are present per millimetre of the conjunctiva - ANSWER A
uniform cobblestone appearance indicates what
