Term
| When recording keratometry values, what is the order? |
|
Definition
| Horizontal/Vertical @ axis |
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Term
| What should be done to the Delta K from straight keratometry readings? |
|
Definition
| Multiply by 1.25 before adding lenticular astigmatism |
|
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Term
| When should 0.50D of ATR be ADDED? |
|
Definition
| If cornea has ATR astigmatism |
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Term
| When should 0.50D of ATR be SUBTRACTED? |
|
Definition
| If cornea has WTR astigamatism |
|
|
Term
| When is no lenticular astigmatism added? |
|
Definition
| When oblique astigmatism is present |
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Term
| When does keratometry axis equal minus cylinder axis? |
|
Definition
| When horizontal meridian is of greater power than the vertical meridian |
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Term
| Does Radial Line require a 20/40 blur? |
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Definition
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|
Term
| Does Radial Line require removing all cylinder from the phoropter? |
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Definition
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Term
| When should equivalent sphere be adjusted in radial line? |
|
Definition
| Once our cylinder power has been moved from zero to 0.50 D past the cylinder endpoint from retinoscopy and every 0.50 after that |
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Term
| Should the end point from Radial Line be bracketed? |
|
Definition
|
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Term
| Where should the cylinder power endpoint from Radial Line be left? |
|
Definition
| On the choice that has an equal response or has less minus if there is no true equal |
|
|
Term
| What is the ratio for maintaining equivalent sphere? |
|
Definition
| 0.25 sph D for every 0.50 cyl D |
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|
Term
| What is the best illumination for Bichrome? |
|
Definition
|
|
Term
| What is the target for bichrome? |
|
Definition
| red/green filter over 20/80 letters |
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|
Term
| Does Bichrome require a 20/40 blur? |
|
Definition
|
|
Term
| Is cylinder power removed for Bichrome test? |
|
Definition
|
|
Term
| What is the recorded endpoint for Bichrome? |
|
Definition
| The sphere power that produces a response of equal |
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Term
| What power should be left in the phoropter for the next test at the end of Bichrome? |
|
Definition
| The sphere power that produces the first response of 'green' |
|
|
Term
| What should be done if the endpoint of Bichrome produces 3 or more responses of 'equal'? |
|
Definition
| add more plus and start over |
|
|
Term
| What should be done if two equal endpoints are found in Bichrome? |
|
Definition
| Average the sphere values together and record that |
|
|
Term
| What is the proper illumination for MSBVA? |
|
Definition
| Standard room illumination |
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|
Term
| Does MSBVA require a 20/40 blur? |
|
Definition
|
|
Term
| What is the proper target for MSBVA? |
|
Definition
| 20/25 to 20/15 target after 20/40 blur |
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|
Term
| In MSBVA, if a pt has a large JND, what should be done? |
|
Definition
| In forced choice present 0.50 D choices, but still make the last choice a 0.25 choice |
|
|
Term
| What is the proper target for JCC? |
|
Definition
|
|
Term
| What is the illumination for JCC? |
|
Definition
| Standard room illumination |
|
|
Term
| When should a cylinder search be performed in JCC? |
|
Definition
| If ret/radial line has indicated sphere (double check it basically) or if the pt has rejected all cylinder in the 1st or 2nd power check |
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|
Term
| Does Distance Equalization require a 20/40 blur? |
|
Definition
|
|
Term
| What is the illumination for Distance Equalization? |
|
Definition
| Standard room illumination |
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|
Term
| What should the Risley prism be set to for Distance Equalization? |
|
Definition
|
|
Term
| What is the first lens power change in Distance Equalization? |
|
Definition
| Add 0.25 D of plus to the eye with the clearer image |
|
|
Term
| What is the second lens power change in Distance Equalization? |
|
Definition
| Add 0.25 of minus to the eye with the blurrier image |
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|
Term
| If the pt initially reports the two lines are equal in Distance Equalization, do you assume that value and move on? |
|
Definition
|
|
Term
| What is the purpose of BSBVA 7a? |
|
Definition
| To find the least minus Rx the pt can achieve BVA through |
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|
Term
| What is the setup for BSBVA 7a? |
|
Definition
| Seque directly from Distance Equalization. Remove prism. Maintain cyl from JCC. 20/20 or 20/10 target |
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|
Term
| What is the most minus that should be given to a pt in BSBVA 7a during forced choice? |
|
Definition
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