Balance
Terms
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- Before what steps during an exam is it important that you balance?
- Binocular testing and near testing
- the end point of dissociated blur is that both charts are
- equally blurry
- Who do you NOT balance
- Presbyopes, Tropes, Monovision pts
- After what step during refraction do you balance?
- Monocular subjective
- Purpose of Balance
- To equalize the stimulus
- What are the BI-OCULAR methods of balanceing
- Blur, Red-Green, Goodwin, Cross Grid
- in which balancing method do you ask which line of letters are "clearer"
- dissociated blur, goodwin
- for dissociated blur, the VAs can be/must be
- Equal
- for red green, the 20/___ line of letters is isolated
- 40
- blur dissociated with ____diopters
- +0.75
- What are the BINOCULAR methods of balancing
- Vectographic and Turville
- why is it imporant to balance
- stereo acuity and fusional vergence will be decreased (possibly resulting in surgery)
- if overminused in red green, the _______ side (what color) will appear to be clearer
- green
- for dissociated, the 20/___ line of letters is isolated
- 40
- in which balancing method do you ask which letters are "blacker/darker/sharper"
- red green
- if overplussed in red green, the _______ side (what color) will appear to be clearer
- red
- the room conditions in bichrome (aka red green) is/are
- dark
- for goodwin it is important that the VAs can be/must be
- equal
- for red green it is important that the VAs can be/must be
- unequal
- in goodwin, isolate the 20/___ line of letters
- 20 or 25
- during goodwin, if the eyes are unbalanced, add +0.25 to which eye?
- the eye seeing the clearer image
- during goodwin, if the eyes are unbalanced after adding +0.25 to the clearer seeing eye
- remove +0.25 from the clearer seeing, and add -0.25 to the poorer seeing.
-
during goodwin, if the eyes are unbalanced after removing +0.25 from the clearer seeing, and adding
-0.25 to the poorer seeing, then - cause a .5 diopter interval by adding an addition +0.25 to the better seeing
- during goodwin, if the eyes are unbalanced after causing a .5 diopter interval by adding an addition +0.25 to the better seeing then
- remove the -0.25 (from the poorer seeing)and add an additional +0.25 to the better seeing (keeping the .5 diopter interval)
- if you have tried every single step in goodwin, and have failed at balancing their eyes, the next step is to
- redo Monocular subjective
- in vectographic, it is important that the VAs can be/must be
- unequal
- the balancing method that uses a polarized chart is
- vectographic
- for vectographic, you can fog with either ____ or ____ diopters
- +0.5 or +.75
- in alternate occlusion, isolate the 20/___ line of letters
- 25
- if the eyes are unequal in alternate occlusion method, add ____ diopters to the ______ (better/poorer)seeing
- +.25, better
- this balancing method utilizes a septum
- turville
- In alternate occlusion, it is important the the VAs can be/must be
- equal
- in these balancing methods, balance is automatic
- Turville and Vectographic
- These balancing methods depend on equal acuities
- Dissociated Blur, Goodwin, and Alternate Occlusion
- In this balancing method, you instruct the patient to look at one side of the chart but keep both eyes open
- Vectographic
- these methods of balancing depend on equal rate of blurring on each eye
- Blur and Goodwin
- In these methods of balancing the patient is not fused
- cross-grid, blur, goodwin, redgreen, and alternate occlusion
- unequal pupils during this balancing method may mess up your results
- red green
- these balancing methods allow the patient to simultaneously compare 2 line of letters
- dissociated blur and goodwin
- these balancing methods require minimum blur, and are thus more accurate
- Goodwin and Alternate
- this method of balancing has no available chart
- cross grid
- these methods of balancing are not good to use on poor binocular vision patients.
- turville and vectographic
- this balanacing method can be used on patients that suppress and eye
- red green
- if a patient is not balanced, what will result?
- stereo may be reduced, fusional amps may be reduced