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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]
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180 minutes
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NCLE National Contact Lens Exam 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
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What is scleral scatter used to view? - =Answer>> details of the cornea like edema and other opacities Wratten #12 yellow filter - =Answer>> used to enhance Fluorscein pattern radial keratotomy - =Answer>> a surgical procedure to treat myopia Silicone Acrylate - =Answer>> first gas permeable rigid lens with silicone added to PMMA to increase Dk value Fluorosilicone Acrylate - =Answer>> rigid material with fluorine added for increased wettability along with silicone for oxygen permeability hybrid lens - =Answer>> Has a rigid gas permeable lens in the center surrounded by a soft contact lens material skirt
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🤔 Hybridgrades101@gmail.com conjunctival injection - =Answer>> enlargement of blood vessels in conjunctiva V-channel gauge - =Answer>> measures lens diameter Projection Magnifier - =Answer>> Also known as a shadowgraph. Used to view the integrity of contact lens edges, blends, transition zones and surface quality. Certain models have a millimeter marking for diameter verification. How often should a contact lens case be replaced? - =Answer>> every 1- 3 mons lacrimal lake - =Answer>> collecting area of the tears at the medial angle of the eye bullous keratopathy - =Answer>> corneal edema with painful blisters in the epithelium due to corneal endothelial dysfunction disinfectant agent for patients with allergic reactions - =Answer>> hydrogen peroxide DK/L Stands for: a. oxygen permeability, b. thermal conduction, c. oxygen transmissibility, d. wettability - =Answer>> C. Oxygen Transmissibility A prism ballast, trunctated lens is on a left eye. The cylinder axis is 90 degrees. Prism base is noted to rotate 15 ddegrees nasally. What cylinder axis shoud be ordered to compensate for the rotation? a. 95, b. 105, c. 110, d. 75, e. 80 - =Answer>> B. 105 Small superficial linear stains are characteristic of? a. foreign particles under the lens, b. poor insertion, c. exposure, d. unblemded peripheral curves, e. flat lens corneal relationship - =Answer>> A. Foreign particles under the lens
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🤔 Hybridgrades101@gmail.com A patient has the following prescription: OD -4.50 -2.00 x 010 "k" 44.25@10/46.25@ A trial lens of -2.00 -1.75 x 020 is placed on the eye. Using a -1.25 OR and the base pivots 10 degrees nasal, which lens should be ordered? a. -3.25 -1.75 x 010, b. -3.25 -1.75 x 180, c. -3.25 -1.75 x 020, d. - 3.25 -1.75 x 030 - =Answer>> B. -3.25 -1.75 x 180 Diffuse corneal stippling observed during a routine 6 month follow up visit is most likely due to: a. microcystic edema, b. posterior surface deposits, c. warped lens, d. gross edema, e. incorrect power - =Answer>> B. Posterior surface deposits Arc staining is observed during a routine follow up visit is most likely due to: a. microcyst edema, b. posterior surface deposits, c. improper recentering technique, d. gross edema, e. incorrect power - =Answer>> C. Improper recentering technique A flourescein pattern which shows a touch apperance in the horizontal meridian and a brighter green in the vertical meridian indicates that the patient has: a. against the rule astigmatism, b. residual astigmatism, c. with the rule astigmatism, d. oblique astigmatism - =Answer>> C. With the rule astigmatism The advantage of fluorocarbon materials include: a. wettability, b. deposit resistance, c. oxygen transmissibility, d. the use of larger lens diameters, e. all of the above - =Answer>> E. All the above If a patient has reduced acuity and a gas permeable lens is found to flex on the eye, which lens modifications are available to the fitter? a. larger diameter, b. steeper base curve, c. flatten base curve, d. thicker lens, e. c and d - =Answer>> E. C and D
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🤔 Hybridgrades101@gmail.com Given the following information: K's 45.00/44.00 @ 090 Rx -3.00 + 1.00 x 180 Which of the following set of specifications would most simulate an intrapalebral RGP fitting? B.C. Rx Dia a. 44.50 -2.50 8. b. 43.50 -1.50 8. c. 43.50 -1.50 9. d. 44.50 -2.50 9.5 - =Answer>> A. 44.50 -2.50 8. RGP lenses should soak for a minimum of ________ hours for disinfection to take place. a. 6 hrs, b. 4 hrs, c. overnight, d. no soaking is needed - =Answer>> B. 4 hrs Given the following information: K's 42.00@180/43.00@90, Rx -2. -.75 x 180 Which of the following set of lens specifications would most simulate a lid attachment RGP fitting: B.C. Rx Dia a. 43.00 -2.50 9. b. 41.50 -1.50 9. c. 42.50 -2.50 8. d. 43.00 -3.00 8.2 - =Answer>> B. 41.50 -1.50 9. Which of the following polishing compounds should not be used with gas permeable lenses? a. sil 02 care b. Silvo c. Alox PG d. XPal - =Answer>> B. Silvo When fitting superior limbal gas permeable lenses, the ideal lens- corneal relationship should include the following except: a. apical clearance b. moderate edge lift c. mild apical bearing d. upper edge of the lens should be located at or near the superior limbus - =Answer>> A. Apical clearance
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🤔 Hybridgrades101@gmail.com A patient fit .50 D flatter than K with contact lens power of -2. would most likely have a spherical component of________ in their spectacle Rx, when in minus cylinder form. (use sam or fap) a. -.50, b. -2.50, c. -1.50, d. none of the above - =Answer>> B. -2. In the Dyer nomogram, the primary curve is the: a. steepest K, b. flattest K, c. median K, d. horizontal K - =Answer>> B. Flattest K Under slit lamp evaluation with fluorescein, corneal areas that appear dark and do not hold stain during blinking are most likely: a. dry spots, b. punctuates, c. infiltrates, d. abrasions - =Answer>> A. Dry spots When fitting one eye for distance and one eye for near, the distance correction is usually placed in the: a. dominant eye, d. non dominant eye c. more minus eye, d. less minus eye - =Answer>> A. Dominant eye A nearsighted person will feel lack of accommodation from presbyopia: a. earlier with contacts, b. earlier with spectacles, c. simultaneously with contact lenses and spectacles, d. not at all with contacts - =Answer>> A. Earlier with contacts A farsighted person will feel lack of accommodation from presbyopia: a. earlier with contacts, b. earlier with spectacles, c. simultaneously with contact lenses and spectacles, d. not at all with contact lenses - =Answer>> B. Earlier with spectacles A rigid lens measures +13.00 BVP. The FVP will measure: a. less power, b. the same power, c. more power, d. an astigmatic reading - =Answer>> A. Less power A late sign of Acanthamoeba Keratitis may include:
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🤔 Hybridgrades101@gmail.com What is the abbreviation for Fluorescein? a. NaCL, b. H2O2, c. NaFl, d. H2O - =Answer>> C. NaFl What preservative, found in gas permeable solutions, can cause serious problems for users of soft contact lenses? a. Dymed, b. Thimersoal, c. Benzylkonium Chloride, d. Sodium Borate
- =Answer>> C. Benzylkonium Chloride When a myopic patient views an object at near through their spectacles, the prism created through the spectacles is: a. base in, b. base out, c. base up, d. base down - =Answer>> A. Base in A patient has a -4.50 spectacle Rx, "k" 45.00/46.00 x 090. The type of lens to fit this patient with would be a: a. hard lens, b. standard soft lens, c. gas permeable lens, d. all of the above - =Answer>> B.. Standard soft lens What effect does a minus lens have on the retinal image size when patient switches from spectacles? a. magnifies it, b. minifies it, c. makes it the same, d. distorts it - =Answer>> A. Magnifies it Which of the following would best be served with rigid contact lenses? a. 42.00/43.00 x 90 -2.00 sph b. 42.00/43.50 x 90 -2.00 -1.50 x 180 c. 42.00/44.00 x 90 -2.00 -1.00 x 180 d. 43.00/43.50 x 90 -2.00 -1.50 x 180 - =Answer>> B. 42.00/43.50 x 90 - 2.00 -1.50 x 180 When keratometric mires reflected off a soft lens are only clear when the wearer blinks, the lens fit is too: a. small, b. large, c. tight, d. loose - =Answer>> C. Tight When watching patients demonstrate proper use of their care system, you should be sure that:
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🤔 Hybridgrades101@gmail.com a. they don't touch the tips of the solutions, b. they clean the lenses using a back and forth motion, c. they understand the function of each solution, d. they should have written instructions, e. all of the above - =Answer>> E. All of the above Which lens adjustment requires a new lens? a. cut down diameter, b. reduce POZ, c. decrease peripheral curve width, d. add -.50 diopters to a minus lens - =Answer>> C. Decrease peripheral curve width Patients should clean lenses with a surfactant cleaner: a. before insertion, b. after removal, c. on a weekly basis, d. whenever they feel dirty - =Answer>> B. After removal In relation to contact lens follow up examinations, the acronym SOAP stands for: a. solutions offer answers to problems, b. service only after payment, c. spectacles off all patients, d. subjective objective assessment plan - =Answer>> D. Subjective objective assessment plan A patient is wearing a 42.00, -3.25 and requires an over refraction of -.50. The total power required with a 41.50 is: a. -2.75, b. -3.25, c. -3.75, d. -4.25 - =Answer>> B. -3. Which of the following parameters changes would result in increased lens movement? a. steeper CPC, b. wider peripheral curves, c. larger diameter, d. larger POZ - =Answer>> B. Wider peripheral curves Which of the following parameter changes would require a new lens? a. cut down diameter, b. make POZ smaller, c. make POZ larger, d. widen pc's - =Answer>> C. Make POZ larger Which of the following parameter changes can be made to the original lens?
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🤔 Hybridgrades101@gmail.com d. .05 .12 .02 .01 - =Answer>> B. .02 .12 .05. A flatter curve is associated with a _______radius and a _______dioptric power. a. longer/lower, b. longer/higher, c. shorter/lower, d. shorter/higher - =Answer>> A. Longer/lower A lens has an overall diameter of 9.2mm. If the PIC/W is .2mm and the PPC/W is .4mm, the POZ is: a. 7.5mm, b. 8.0mm, c. 7.0mm, d. 8.2mm - =Answer>> B. 8.0mm The B&L keratometer extends from a range of: a. 42.00 to 48.00, b. 28.00 to 50.00, c. 36.00 to 52.00, d. 40.00 to 49.00 - =Answer>> C. 36.00 to 52. The keratometer eyepiece if not properly focused can cause: a. distortion of the mire, b. a cylinder to be induced, c. the image of the mire to disappear, d. errors in correctly reading curvature - =Answer>> D. Errors in correctly reading curvature A lens has an overall diameter of 9.5mm. If the PIC/W is .2mm and the PPC/W is .4mm, the POZ is: a. 7.5mm, b. 8.0mm, c. 7.0mm, d. 8.3mm - =Answer>> D. 8.3mm The B&L keratometer extends from a range of: a. 42.00 to 48.00, b. 28.00 to 50.00, c. 36.00 to 52.00, d. 40.00 to 49.00 - =Answer>> C. 36.00 to 52. Identify the astigmatism: 44.00@180/45.00@ a. irregular, b. regular, c. with the rule, d. against the rule - =Answer>> C. With the rule A cornea having its flattest meridian at 85 and steepest at 175 is said to have what type of astigmatism? a. with the rule, b. against the rule, c. oblique, d. asymmetrical - =Answer>> B. Against the rule
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🤔 Hybridgrades101@gmail.com Arrange in order the following steps in keratometry:
- superimpose images(+and-), 2. center crosshair, 3. focus eyepiece,
- locate principle meridians, 5. position patient, 6. calibrate power drums a. 5-3-2-6-4-1, b. 5-3-2-6-1-4, c. 6-3-5-2-1-4, d. 3-6-5-2-1-4, e. 3-6-5-2- 4-1 - =Answer>> E. 3-6-5-2-4- The keratometer eyepiece if not properly focused can cause: a. distortion of the mire, b. a cylinder to be induced, c. the image of the mire to disappear, d. errors in correctly reading curvature - =Answer>> D. Errors in correctly reading curvature A hyperflange lens is used on________ a. high minus lenses, b. high plus lenses, c. aphakic lenses, d. prism lenses - =Answer>> A. High minus lenses The radiuscope is used to: a. measure the radius of the PCC, b. measures the radius of the ACC, c. inspect the surface for deposits and scratches, d. detect lens warpage, e. all of the above - =Answer>> E. All of the above The steepest part of the cornea is: a. the visual zone, b. the geometric center, c. the apex, d. the transitional zone - =Answer>> C. The apex The profile analyzer is used mainly for the purpose of: a. evaluating peripheral curve design, b. examining the lens edge, c. evaluating the optical design, d. a and b, e. all of the above - =Answer>> D. A and B The transition zone between the cornea and the conjunctiva/sclera is called the: a. optical zone, b. conjunctival fornix, c. corneal limbus, d. twilight zone - =Answer>> C. Corneal limbus
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🤔 Hybridgrades101@gmail.com The keratometer measures a point within the cornea called the: a. apical center, b. geometric center, c. visual center, d. transition center - =Answer>> C. Visual center The radiuscope is not used for: a. measuring a spherical lens, b. measuring a toric radius, c. detecting surface warpage, d. inspecting the lens surface, e. measuring the "e" value of a spheric lens - =Answer>> E. Mesauring the "E" value of a spheric lens In order to convert diopters to millimeters, which index of refraction is used in the surface power formula? a. 1.3336, b. 1.3375, c. 1.3385, d. 1.3360 - =Answer>> B. 1. The universal term given to an instrument that measures corneal curvature is: a. P.E.K, b. keratometer, c. opthalmometer, d. lensometer - =Answer>> C. Opthalmometer Which lens would you use a photoelectric keratoscope to achieve the best fit? a. aspheric back curve, b. aspheric front curve, c. back toric, d. front toric - =Answer>> A. Aspheric back curve The cornea: a. steepens more temporally than nasally, b. flattens more temporally than nasally, c. steepens more nasally than temporally, d. flattens more nasally than temporally, e. b and c - =Answer>> E. B and C At a 36.00 diopter curve the keratometer measures approximately______mm chord of the cornea. a. 4mm, b. 8mm, c. 3mm, d. 1mm - =Answer>> A. 4mm In addition to measuring the cornea, the keratometer can be used to: a. check the power of the contact lens, b. check the curvature of a contact lens, c. check the thickness of a contact lens, d. check the
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🤔 Hybridgrades101@gmail.com diameter of a contact lens - =Answer>> B. Check the curvature of a contact lens When the keratometer is out of focus on the cornea: a. the lower right mire is doubled, b. a repair man should be called, c. have the patient move forward or back, d. this is an unimportant finding - =Answer>> A. The lower right mire is doubled The amount of corneal astigmatism: a. cannot be measured with the keratometer, b. is the difference between the reading on the horizontal and vertical drums, c. is calculated by multiplying the axis times the horizontal drum reading, d. is calculated by multiplying the axis times the vertical drum reading - =Answer>> B. Is the difference between the reading on the horizontal and vertical drums When classic keratometry is performed by having the patient sight on the mirrored image of their eye, alignment of what is accomplished? a. the apex with the visual axis, b. the optical axis with the apex, c. the optical axis with the visual axis, d. the posterior axis with the primary axis - =Answer>> C. The optical axis with the visual axis Residual astigmatism can be corrected through the use of: a. soft lenses, b. rigid spherical lenses, c. front toric lenses, d. aspheric lenses - =Answer>> C. Front toric lenses The soft lens analyzer is a system for comparing the ______of the lens to a series of spherical templates. a. PPC, b. PIC, c. Base Curve, d. all of these - =Answer>> C. Base curve A contact lens measures 9.5mm. The optic zone is 8.1mm. What is the total width of the peripheral curve system? a. 1.4mm, b. 5mm, c. 9mm, d. .7mm - =Answer>> D. .7mm 9.5-8.1 = 1.4 divided by 2 =. The tolerance for the diameter of a corneal contact lens is:
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🤔 Hybridgrades101@gmail.com a. coefficient of thermal conduction, b. oxygen permeability of a material, c. wetting angle, d. durability strength - =Answer>> B. Oxygen permeability of a material Which of the following is not used when blending peripheral curves in the office? a. slot gauge, b. radius lap tools, c. polishing compound, d. suction cups - =Answer>> A. Slot gauge In against the rule astigmatism, the steepest corneal meridian: a. is at or near 180 degrees, b. is at or near 135 degrees, c. is at or near 90 degrees, d. is at or near 45 degrees - =Answer>> A. Is at or near 180 degrees Complete the following formula: ____________= corneal+ lenticular astigmatism. a. Total, b. WTR, c. ATR, d. Oblique - =Answer>> A. Total Which of the following cannot be verified by the keratometer? a. WTR, b. ATR, c. Oblique, d. Lenticular astigmatism - =Answer>> D. Lenticular astigmatism The following keratometer reading would indicate: +O+ a. keratoconus, b. corneal scar, c. eyelids not open, d. WTR astigmatism - =Answer>> D. WTR astigmatism Which contact lens offers the best comfort and easiest adaption? a. PMMA, b. silicone, c. RGP, d. Soft - =Answer>> D. Soft The major drawback of contact lens materials containing silicone is: a. optics, b. durability, c. wettability, d. oxygen transmission - =Answer>> C. Wettability Given: -4.00 -1.00 x 180, "k" 42.00@180/42.00@90. What type of lens would correct this?
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🤔 Hybridgrades101@gmail.com a. soft spherical lens, b. rigid spherical lens, c. front toric, d. aspheric lens - =Answer>> C. Front toric After the sharp juctures between curves on the lens posterior are smoothed out, they are called: a. blends, b. lenticulation, c. bevels, d. smooth junction - =Answer>> A. Blends Upon removal of the crystalline lens, the patient is: a. aphakic, b. myopic, c. hyperopic, d. astigmatic - =Answer>> A. Aphakic A hardening of the crystalline lens causing a loss of accommodation is known as: a. presbyopia, b. myopia, c. hyperopia, d. aphakia - =Answer>> A. Presbyopia Which of the following can be used to prevent rotational movement of a corneal lens? a. Prism Ballast, b. Truncation, c. toric A.C.C. on highly astigmatic cornea, d. a and b, e. all of these - =Answer>> D. A and B Finished contact lenses have the following properties: a. diameter cut to size and both sides surfaced, b. peripheral curves have been added, c. edge has been finished, d. A,B and C, e. all of the above - =Answer>> E. All of the above The term "Haptic" lens is used in reference to: a. corneal lens, b. cosmetic lens, c. truncated lens, d. scleral lens - =Answer>> D. Scleral lens In the making of concentric style bifocals, the different power zones (distance and near) may be ground on: a. the front surface, b. the back surface, c. either surface, d. both surfaces - =Answer>> C. Either surface
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