CPOA Contact lens and fitting
(Answered) 113 Q&A. 2025/2026. 100%
Verified.
Palpebral aperture
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
The average fissure size
The visible iris diameter
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
The normal iris diameter reading is
10-15 times per minute
A blink rate of how many times is normal
With a wisp of wet sterile cotton onto the cornea from one side
How is corneal sensitivity measured
Long term PMMA contact lens wear
Abnormal blink response is a frequent manifestation of what
10-15 seconds
Tear film should remain uniform over the corneal surface for a minimum of how long after a normal
blink
Mucoid
A short tear film breakup time indicate s problem with what layer of the tear film
Blue cobalt
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
What is the indicator of poor tear film quality
The number of seconds it takes for the first dry spot to appear
What is the important value to observe when doing a tear film analysis
, 6-9 seconds
What is the borderline time for Tear film breakup time
5 seconds or less
Tear break up time of how long should be a contradiction to contact lens wear
Decrease
Will tear film breakup increase or decrease with contact lens wear
Schirmer tear strips or Phenol Red Thread Test
What methods are used to measure tear quality, an adequate tear supply or quantity
15- to 20mm in 5 minutes is normal
What is a normal reading for Schirmer test
Less than 10mm
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
What are the benefits of the Phenol Red Thread Test
Sodium Fluorescein
What should the patients corneal be stained with for the
True
True or false? Fluorescein dye will not absorb into a PMMA or GP lens, but can temporarily discolor a
soft lens
Papillae
Raised area on the underside of the lids
several papillae are present per millimetre of the conjunctiva
A uniform cobblestone appearance indicates what
1-3 papillae per millimeter of the lid conjunctiva
Non-uniform cobblestone appearance (NUCA) of the lids would be represented how
Papillae are usually greater than 1mm in size and are located in all 5 zone
Define GPC- Giant Papillary conjunctivitis
The radius of curvature of the corneal portion of the anterior or front surface of the cornea
The primary function of the keratometer is to measure
Gas Permeable
This lens material provides oxygen to the cornea by direct transmission
(Answered) 113 Q&A. 2025/2026. 100%
Verified.
Palpebral aperture
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
The average fissure size
The visible iris diameter
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
The normal iris diameter reading is
10-15 times per minute
A blink rate of how many times is normal
With a wisp of wet sterile cotton onto the cornea from one side
How is corneal sensitivity measured
Long term PMMA contact lens wear
Abnormal blink response is a frequent manifestation of what
10-15 seconds
Tear film should remain uniform over the corneal surface for a minimum of how long after a normal
blink
Mucoid
A short tear film breakup time indicate s problem with what layer of the tear film
Blue cobalt
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
What is the indicator of poor tear film quality
The number of seconds it takes for the first dry spot to appear
What is the important value to observe when doing a tear film analysis
, 6-9 seconds
What is the borderline time for Tear film breakup time
5 seconds or less
Tear break up time of how long should be a contradiction to contact lens wear
Decrease
Will tear film breakup increase or decrease with contact lens wear
Schirmer tear strips or Phenol Red Thread Test
What methods are used to measure tear quality, an adequate tear supply or quantity
15- to 20mm in 5 minutes is normal
What is a normal reading for Schirmer test
Less than 10mm
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
What are the benefits of the Phenol Red Thread Test
Sodium Fluorescein
What should the patients corneal be stained with for the
True
True or false? Fluorescein dye will not absorb into a PMMA or GP lens, but can temporarily discolor a
soft lens
Papillae
Raised area on the underside of the lids
several papillae are present per millimetre of the conjunctiva
A uniform cobblestone appearance indicates what
1-3 papillae per millimeter of the lid conjunctiva
Non-uniform cobblestone appearance (NUCA) of the lids would be represented how
Papillae are usually greater than 1mm in size and are located in all 5 zone
Define GPC- Giant Papillary conjunctivitis
The radius of curvature of the corneal portion of the anterior or front surface of the cornea
The primary function of the keratometer is to measure
Gas Permeable
This lens material provides oxygen to the cornea by direct transmission
