Bifocal - Study guides, Class notes & Summaries

ABO Practical UPDATED Exam Questions and CORRECT Answers only Single Vision - Correct Answer- corrects for one distance Multifocal - Correct Answer- Corrects with two or more prescriptions (or 'powers') Bifocal - Correct Answer- lens having two focus strengths Trifocal - Correct Answer- pertaining to having three focus strengths Calculating Prismatic Effects - Correct Answer- obtained at the center of an optical lens by producing a difference in edge thickness, either by grinding the ba...

Math for ABO test Latest Questions and Answers(American Board of Opticianry (ABO) A Box: 53 DBL: 15 ED: 55 PD: 30/32 OD: 68/2 =34 OS: 68/2=34 What is the MBS for the rt and left lens? {Answer: - OD: 68/2 =34 OS: 68/2=34 Decentration: Frame PD- PT PD OD: 34-30=4 decentered OS: 34-32= 2 decentered OD: MBS=ED+(2xDecenter)+2 MBS=55+ 8 (2x4)+2=65mm OS: MBS=ED+(2x decenter)+2 MBS=55+4 (2x2)+2=61mm OD-65mm blank OS: 61MM blank What is Prentice rule used for? {Answer: - To (Power x di...

Steep Fluorescein Pattern - Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern - Bright green pooling vertically, faint green pooling horizontally Prism Ballast - Common technique to stabilize lens from rotating. Added thickness ...

If the wearer complains of the bifocal line being somewhat in his way when driving, the problem may be alleviated by decreasing the distance between pads. True or False - False If the wearer complains that the glasses feel snug but still slip down the nose, one likely cause is that: A. The frame is too small B. The bridge fit is tight C. Pressure is being applied by the temple shafts anterior to the ear. D. Pressure is being applied on the very tips of the temples. - Pressure is being app...

NCLE Practice Test Practical Questions and Answers with Certified Solutions Steep Fluorescein Pattern Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern Bright green pooling vertically, faint green pooling horizontally Prism Ballast Common te...

Single Vision CORRECT ANSWER corrects for one distance Multifocal CORRECT ANSWER Corrects with two or more prescriptions (or 'powers') Bifocal CORRECT ANSWER lens having two focus strengths Trifocal CORRECT ANSWER pertaining to having three focus strengths Calculating Prismatic Effects CORRECT ANSWER obtained at the center of an optical lens by producing a difference in edge thickness, either by grinding the back surface at an angle to the front surface during lens surfacing or, if...

Single Vision - ANSWER-corrects for one distance Multifocal - ANSWER-Corrects with two or more prescriptions (or 'powers') Bifocal - ANSWER-lens having two focus strengths Trifocal - ANSWER-pertaining to having three focus strengths Calculating Prismatic Effects - ANSWER-obtained at the center of an optical lens by producing a difference in edge thickness, either by grinding the back surface at an angle to the front surface during lens surfacing or, if the lens has sufficient power...

If the wearer complains of the bifocal line being somewhat in his way when driving, the problem may be alleviated by decreasing the distance between pads. True or False - Answer- False If the wearer complains that the glasses feel snug but still slip down the nose, one likely cause is that: A. The frame is too small B. The bridge fit is tight C. Pressure is being applied by the temple shafts anterior to the ear. D. Pressure is being applied on the very tips of the temples. - Answer- ...

ABO (American Board of Opticianry) Exam Latest Questions With Complete Solutions Change a bifocal Rx to a single vision Rx [Ans: - Add the bifocal power to the sphere powers. OD: -0.50 OS: -0.25-0.25x172 Add: +1.75 Turns into- OD: +1.25 OS: +1.50-0.25x172 Anisometropia [Ans: - There is a difference of 3 diopters between both eyes; when the vision of the eyes differs by a large margin. Antimetropia [Ans: - Refers to Rx's that differ in sign. Ex. OD: +0.25 OS: -0.75 Simple H...

NCLE Practical Questions and Answers Verified A+ Steep Fluorescein Pattern - Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern - Bright green pooling vertically, faint green pooling horizontally Pri...