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National Certification Organization
for Opticians
The National Contact Lens Examiners
(NCLE) ABO American Board of Opticianry
CLRE Contact Lens Registry Examination
Course Title and Number: ABO NOCE Competency Exam Exam Title: Registry Exam Exam Date: Exam 2025- 2026 Instructor: [Insert Instructor’s Name] Student Name: [Insert Student’s Name] Student ID: [Insert Student ID]
Examination
180 minutes
Instructions:
- Read each question carefully.
- Answer all questions.
- Use the provided answer sheet to mark your responses.
- Ensure all answers are final before submitting the exam.
- Please answer each question below and click Submit when you have completed the Exam.
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- This is Exam which will assess your knowledge on the course Learning Resources.
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NCLE - CLRE Contact Lens Registry Examination Review Questions and Answers | 100% Pass Guaranteed | Graded A+ | 2025- The National Contact Lens Examiners NCLE ABO American Board of Opticianry CLRE Contact Lens Registry Examination
Read All Instructions Carefully and Answer All the
Questions Correctly Good Luck: -
A patient returns for follow up care with a rhino virus and is taking an over the counter decongestant/antihistamine. A possible side effect is: - =Answer>> Corneal dehydration All of the following are layers of the cornea except: - =Answer>> a. Descemet's membrane *b. Stroman's membrane c. Epithelium d. Endothelium Which of the following cannot be modified on contact lenses? - =Answer>> a. Power b. Diameter *c. Radius d. Sagittal depth The best method to fit an individual with keratoconus is with a: - =Answer>> Trial lens evaluation
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🤔 Hybridgrades101@gmail.com A R.G.P. lens of 9.3 diameter is fitting too steep. Without reordering the lens, you might: - =Answer>> Decrease the diameter of the lens Which of the following modifications cannot be performed on a contact lens? - =Answer>> a. Blend transition zone b. Flatten secondary curve c. Reduce optical zone diameter *d. Steepen peripheral curves If the base curve of a contact lens was ordered 7.40 mm and the lens received measures 7.45 mm, it is __________than the lens ordered. - =Answer>> 0.25 diopter flatter PMMA stands for.... - =Answer>> polymethylmethacrylate PMMA - =Answer>> - this first hard, transparent material to be used as a contact lens
- gave consistent vision, durability, fabricated and could correct for 3.0D of corneal astigmatism
- not comfortable at all, no gas exchange, caused corneal edema and spectacle blur RGP stands for... - =Answer>> Rigid Gas Permeable lens, describes lenses that are made with a material more rigid than soft contact lenses. Effectively correct for corneal astigmatism, provide sharper optics and last longer than soft contact lenses. Initial insertion can cause more blinking and tears than a soft contact lens. CAB stands for... - =Answer>> Cellulose Acetate Butyrate CAB - =Answer>> - wets easier than PMMA
- more comfortable lens, allowed for a longer wearing schedule
- poor shape retention, could warp after a year or hydration
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🤔 Hybridgrades101@gmail.com Silicon-Acrylate - =Answer>> - 38% silicone and 65% PMMA
- was more stable, so lenses could be manufactured thinner; increasing patient comfort and oxygen transmission Fluorocarbon/Fluorocarbon Silicon-Acrylate - =Answer>> - made of pure floropolymer or often combined with silicone HEMMA stands for... - =Answer>> hydroxyethylmethacrylate HEMMA - =Answer>> - first material that soft contact lenses were manufactured in
- gel-like substance, greater comfort, rapid adaptation, lack of spectacle blur..etc
- lack durability, impossible to modify, susceptible to protein build up Low water contact lenses - =Answer>> Have a water content less than 39%, these lenses provide sufficient oxygen for daily wear High water contact lenses - =Answer>> Have a water content of 79%, they allow for even more oxygen transmission, these are usually extended wear contact lenses Increasing the sagittal depth of a rigid lens will: - =Answer>> Not change the effective power of the lens If the diameter of an R.G.P. lens is 9.2 mm and is fitting too steep on the cornea, what adjustment could be made to the lens? - =Answer>> Decrease the diameter The DK value of a lens is: - =Answer>> Oxygen permeability of the material All of the following are functions of a wetting solution except: - =Answer>> It helps to clean the lenses after removal from the eye
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🤔 Hybridgrades101@gmail.com Bitoric lenses are used: - =Answer>> when there is a great deal of corneal astigmatism Prism ballast lenses are used: - =Answer>> To keep the lens from rotating All of the following are symptoms of a loose fitting contact lens except: - =Answer>> a. Difficulty moving eyes b. Lid sensation c. Lens popping out *d. Burning The tolerance of the posterior, secondary, intermediate or peripheral curve radius according to ANSI standards is: - =Answer>> +0.10 mm The tolerance of the prism power (measured from the geometric center) of a corneal contact lens from +10.OOD to 10.OOD per ANSI standards is: - =Answer>> 0.25 prism diopters The tolerance for the diameter of a corneal contact lens per ANSI standards is: - =Answer>> +0.05 mm Orthokeratology may be defined as: - =Answer>> Reduction of refractive errors by corneal molding with contact lens applications While evaluating the fluorescein pattern of a rigid lens, you determine that the lens vaults the cornea, is parallel in the periphery, and flares out at the edges. You decide that the lens: - =Answer>> Is well fitted Which of the following is a contraindication for fitting contact lenses?
- =Answer>> Anesthetic cornea The purpose of the topogometer is to: - =Answer>> Measure the diameter of the apex of the cornea
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🤔 Hybridgrades101@gmail.com Which of the following is an example of Against the Rule Astigmatism? - =Answer>> a. 44.50@90/42.50@ b. 44.50@180/42.50@ *c. 42.50@170/43.50@ d. 41.75@135/42.50@ Which of the following can be used to evaluate the proper blend of an RGP lens? - =Answer>> Shadowgraph An annular bifocal contact lens is a type of: - =Answer>>. Concentric bifocal contact lens The cause of a 3 and 9 o'clock stain observed on a RGP wearer might be: - =Answer>> An incomplete blink A reason bubbles are discovered under an RGP lens might be that the: - =Answer>> Lens is too large A possible cause of blur when reading with an RGP lens might be: - =Answer>> Poor centration A possible cause for edge sensation of a rigid lens wearer is that the:
- =Answer>> Lens is too flat Which of the following lens materials should not be evaluated with sodium flourescein? - =Answer>> a. PMMA *b. HEMA c. RGP d. P A free living protozoa, acanthamoeba, is more likely found: - =Answer>> In home made saline solutions A patient with pseudoaphakia will require a prescription for: - =Answer>> Near acuity
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