Plus lenses are Study guides, Class notes & Summaries

NCLE Practice Test 100% Solved A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - Answer-d) have the ability to reproduce Which of the following prescriptions indicates against-the-rule astigmatism? a)-4.50 +1.00 x75 b)-4.50 +1.00 x 180 c)-4.50 -1.00 x 165 d)4.50 -1.00 x 180 - Answer-a)-4.50 +1.00 x75 When a keratometer is bei...

The amount of reflection of each surface of cr-39 lenses is approximately? A. 2% B. 4% C. 6% D. 8% - 4% The absorption of light in lenses is classified by two variables. What are they? A. Base curve and thickness B. Index of refraction and thickness C. Thickness and lens transmission D. Tint, and lens transmission - C. Thickness and len transmission The denser the tint in a lens____ A. The greater transmission of light through the lens B. The greater internal reflections in th...

ABO Practical(ABO Practical broken down based on the ABO-NCLE practical Exam Candidate HandbookPractical Test Specifications sheet) Single Vision corrects for one distance Multifocal Corrects with two or more prescriptions (or 'powers') 00:05 01:09 Bifocal lens having two focus strengths Trifocal pertaining to having three focus strengths Calculating Prismatic Effects obtained at the center of an optical lens by producing a difference in edge thickness, eith...

ABO Practice Test (Questions and Answers) 2024/2025 To mount a lens in a nylon suspension type frame, it would be necessary to _______ the lens. a) Drill b) Notch c) Groove d) V-Bevel - Answer ️️ -c) Groove The optical center of a lens is: a) At the geometrical center b) One the 180 line c) At the point where the "a" and "b" measurement meet d) A lens location of zero deviation of the optical axis - Answer ️️ -d) A lens location of zero deviation of the optical axis The p...

NCLE Exam Prep Questions and Answers Latest Update (2024/2025) 100% Pass optic zone - Answer ️️ -the central portion of a contact lens which contains the refractive power and generally corresponds to the central corneal cap posterior apecal radius - Answer ️️ -this term is generally used in reference to spin-cast soft lenses. the curvature of the posterior surface of the lens changes with the refractive power. the radius of curvature is measured at the apex of the posterior surface...

Base Curve - Curvature of the front of the lens How is Cyl ground on a minus cyl lens? - Single curve on the front. Cyl ground on the back How is cyl ground on a plus cyl lens? - Flattest curve on the front. Old way of doing it do to cosmetics What is Vogels formula used for? - Creating best form and n standard surfacing Vogel's Formula (+ lenses) - Spherical equivalent + 6.00 Vogel's Formula (- lenses) - Spherical equivalent + 6.00 / 2 Corrected Curve Theory rules: - #1 ocul...

ABO -American Board of Opticianry Practice Test With Correct Questions and Answers/Assured Pass 2024 When discussing thick lenses, the factors which are considered in computing the lens power are: a. front curve, thickness and index b. back curve, thickness and index c. front curve, back curve and thickness d. front curve, back curve, thickness and index (Ans: - d. front curve, back curve, thickness and index Toric transposition shows: a. lens thickness b. power in principal mer...

NCLE Practice Test A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - d) have the ability to reproduce Which of the following prescriptions indicates against-the-rule astigmatism? a)-4.50 +1.00 x75 b)-4.50 +1.00 x 180 c)-4.50 -1.00 x 165 d)4.50 -1.00 x 180 - a)-4.50 +1.00 x75 When a keratometer is being calibrated, w...

ABO PRACTICE TEST REVIEWED AND UPDATED QUESTIONS AND ANSWERS 2024 To mount a lens in a nylon suspension type frame, it would be necessary to _______ the lens. a) Drill b) Notch c) Groove d) V-Bevel - CORRECT ANSWERS-c) Groove The optical center of a lens is: a) At the geometrical center b) One the 180 line c) At the point where the "a" and "b" measurement meet d) A lens location of zero deviation of the optical axis - CORRECT ANSWERS-d) A lens location of zero deviation of ...

c. 5 mm from the top of the segment d. at the very bottom of the segment - answerb. in the geometric center of the segment The base curve of any multifocal lens is found on the surface containing the: a. cross curve b. cylinder surface c. segment d. ocular curve - answerc. segment Normal slab-off (bicentric grind) is ground on the lens whose vertical meridian has the: a. strongest curves b. most plus power c. least plus power d. least minus power - answerc. least plus power The refra...