COT Actual exam Latest 2024 | Questions with 100% Solutions
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Course
COT
Institution
COT
rotating lens system
focusing sleeve - rotating lens system
raising or lowering the focus sleeve of a streak retinoscope does what? - changes the vergence
of the light leaving the instrument
COT Actual exam Latest 2024 |
Questions with 100% Solutions
All of the following are true regarding the accommodative reflex except: It is stimulated by a blurred
image, It is not a true reflex, It is required for viewing distant objects or it includes convergence, miois &
focusing - ✔✔It is required for viewing distant objects
When the ciliary muscle relaxes what happens? - ✔✔The lens is pulled thinner
The main reason one's accommodation ability decreases with age is due to what? - ✔✔Hardening
of the crystalline lens
With accommodation fully relaxed what is the pt's point of clearest vision? - ✔✔the far point
the power of a myopic eye itself is what? - ✔✔plus
the retinoscope provides information on the pt's refractive status by doing what? - ✔✔reflecting
light off the pts' retina
the streak retinoscope permits what? - ✔✔neutralization of individual ocular meridians
all of the following are components of the streak retinoscope except which one?
light & power sources
condensing lens & mirror
,rotating lens system
focusing sleeve - ✔✔rotating lens system
raising or lowering the focus sleeve of a streak retinoscope does what? - ✔✔changes the vergence
of the light leaving the instrument
the plane mirror effect is used in streak retinoscopy because? - ✔✔this projects parallel light rays
into the eye
if a streak retinoscope is habitually placed flat on the table what will happen? - ✔✔the filament
may bend causing a distorted streak
a working lens is required in retinoscopy in order to? - ✔✔simulate working at infinity
standard retinoscopy working distance is - ✔✔66cm
if you use a retinoscopy working distance this is closer than the standard your working lens will need to
be what? - ✔✔more plus power than standard
which of the following can be determined with the most accuracy using a streak retinoscope? sphere
power, sphere axis, cylinder power or cylinder axis? - ✔✔cylinder axis
the magnitude of a refractive error can often be evaluated by noting all of these streak qualities except:
brightness, width, speed or height? - ✔✔height
in streak retinoscopy the intercept is what? - ✔✔the part of the streak that falls on the pt's iris
if you sweep the retinocope streak across the pt's pupil & the reflex travels in the same direction as
the intercept this is known as what? - ✔✔with motion
,most retinoscopists prefer to neutralize with motion because why? - ✔✔against motion can
be difficult to evaluate
one can convert any situation to with motion by adding what? - ✔✔enough minus sphere
one matches the retinoscope streak to the axis of the refractive error by doing what? - ✔✔rotating
the sleeve until there is an unbroken line
as the measurement approaches neutrality, the reflex will become what? - ✔✔brighter, wider
& faster`
at the point of neutrality the reflex will? - ✔✔seem to blink on & off
all of the following regarding use of the streak retinoscope are true except? 1. keep the room lights low,
2. keep both of your eyes open, 3. measure the pt's right eye with your right eye or 4. when using your
right eye, hold the retinoscope in your left hand. - ✔✔when using your right eye hold the
retinoscope in your left hand.
to help stabilize the retinoscope & maintain alignment do what? - ✔✔rest it against your brow
or spectacle frame
if your pt is not dilated for retinoscopy, instruct him to look at what? - ✔✔a target on the
distance chart
if your pt is fully dilated for retinoscopy, you should do what? - ✔✔concentrate on the central
portion of the reflex
in streak retinoscopy if the streak is vertical you should what? - ✔✔sweep the streak left to right
in your initial retinoscopy evaluation (using the proper lens) you note that that pt has "against" motion
in every meridian, this indicates what? - ✔✔myopia
, in your initial retinoscopy evaluation (using the proper lens) you note that that pt has "with" motion in
one meridian and "against" motion in the other, this indicates what? - ✔✔mixed astigmatism
in your initial retinoscopy evaluation (using the proper working lens), you note that the pt seems to
be neutralized already, you should do what? - ✔✔double check for a high refractive error
you are working in + cylinder using a working lens you see "with motion at 90 degrees & neutralize this
with +1.50 sphere you now see "with" motion @ 180 degrees next you should do what? - ✔✔set
the cylinder axis @ 180 & add cylinder until the reflex is neutralized
you are working in minus cylinder using a working lens you have neutralized "with" motion at 45
degrees you turn to 135 and now see "with" motion you should do what/ - ✔✔neutralize at
135 degrees by giving more + sphere then neutralize @ 45 degrees with cylinder
if not using the built-in retinoscopy lens on the refractor when the measurement is complete you must -
✔✔subtract 1/50 sphere for the working distance
which of the following pts would probably be the easiest to retinoscope? a pt what has had a corneal
graft, a pt with a posterior subcapsular cataract, a pt with an IOL implant or a pt who has had refractive
surgery? - ✔✔a pt with an IOL implant
all of the following are true regarding fogging except? it may be used during cross cylinder testing, it
may be used to help prevent giving too much minus, it can be used as an alternative to occlusion or it
can be used to relax accommodation? - ✔✔it may be used during cross cylinder testing
fogging is accomplished by what? - ✔✔placing enough + power in front of the eye to blur the vision
the astigmatic dial is useful for what? - ✔✔estimating the cylinder axis
the astigmatic dial looks like what? - ✔✔a clock faceq
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