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COT Actual exam Latest 2024 | Questions with 100% Solutions
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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

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  • September 7, 2024
  • 60
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • cot actual exam
  • latest 2024 questions
  • ciliary muscle
  • accommodative reflex
  • myopic eye
  • streak retinoscope
  • rotating lens system

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  • COT
  • COT

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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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