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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
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NCLE Contact Lens Comprehensive Exam Prep Practice Test 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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which of the following signs may be exhibited by a soft lens that is fit too tightly? - =Answer>> indentation of the lens edge on the sclera which of the following signs may be exhibited by a soft lens that is fit too loosely? - =Answer>> lag on upward gaze Which of the following cold disinfection chemicals is least likely to cause a reaction when the product is used according to directions? - - =Answer>> hydrogen peroxide If 3% generic hydrogen peroxide is substituted for the solution in one of the FDA approved hydrogen peroxide care systems - - =Answer>> The solution may discolor the lens Use of Wratten #12 or Tiffen yellow filter is important in evaluating the fluorescence pattern of patients with GP lenses because: - -
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🤔 Hybridgrades101@gmail.com c. the base curve the distance between a flat surface and the back surface of te central portion of a lens is the: - =Answer>> sagittal depth a contact lens design which utilizes a lenticular bowl is typically employed with: - =Answer>> higher minus lenses a loose fitting contact lens can be made to fit tighter by: - =Answer>> shortening the radius of curvature of the CPC the first all plastic corneal contact lens was developed by Kevin Tuochy in: - =Answer>> 1947 an example of a hydrophilic lens material is: - =Answer>> HEMA bicurve rigid contact lenses are usually: a. small and steep b. fit within the interpalpebral fissure limits c. made with narrow peripheral curves - =Answer>> a. small and steep b. fit within the interpalpebral fissure limits c. made with narrow peripheral curves when the radius of curvature is held constant while the diameter is increased, the vault of the lens will be: - =Answer>> increased the tear film consists of which of the following? - =Answer>> aqueous layer lipid film mucin film the primary function of the mucin film is to: - =Answer>> change the corneal epithelial surface from a hydrophobic surface to a hydrophilic surface
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🤔 Hybridgrades101@gmail.com the lipid layer functions primarily to: - =Answer>> prevent evaporation of the tear film the test which assesses the QUANTITY of tears normally produced is: - =Answer>> Schirmer test the test which assesses the QUALITY of the tear film is: - =Answer>> TBUT OR BUT tear break up time prospective patients who fall within the following age group generally provide the best prognosis for successful contact lens fitting: - =Answer>> 13 to 38 which of the following would indicate a good prognosis for successful contact lens fitting? - =Answer>> adequate manual dexterity regular low astigmatism B U T's longer then 15 seconds the base curve of a certain lens is equal to 7.5 mm of radius of curvature. the equivalent power in diopters is: - =Answer>> 45. the primary function of a keratometer is to: - =Answer>> measure the curvature of the cornea when moved 5 mm from its original position the effective power of a 10.00 diopter lens will change: - =Answer>> 0.50 D a spectacle lens is prescribed at -10.00 D provided that the lens is fit at a vertex distance of 10 mm. a rigid contact lens fit " on K " for this patient would require a power of: - =Answer>> -9.00 D spectacle RX = + 10.00 D vertex distance = 10 mm a rigid contact lens fit " on K " would require the following power: - =Answer>> +11.00 D
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🤔 Hybridgrades101@gmail.com the CPC of a trial contact lens is 44.00 diopters and contains a power equal to +14.87 D. the over refraction is equal to -1.62 D. what final lens power is required if the CPC to be ordered is 43.62 diopter - =Answer>> +13.62 D a -3.50 D lens with a base curve of 44.50 provides excellent visual acuity. if the CPC were changed to 45.00 D what power would be needed? - =Answer>> -4.00 D a "dry eye" condition can be evaluated through which of the following tests? - =Answer>> schirmer test a new contact lens wearer should become familiar with the: - =Answer>> blinking mechanism the pre-corneal tear film provides: - =Answer>> an optical surface metabolic nutrients the normal cornea is in a constant state of partial dehydration also known as detergence. the layer of the cornea most responsible for maintaining this function is: - =Answer>> the endothelium RX -3.25 - 1.00 x 180 k readings 44.25 x 180/ 45.25 x 90 vertex distance= 12 mm the correct design of the CPC and power of a contact lens fitting " on K" would be: - =Answer>> 44.25 - 3. RX -3.25 - 1.00 x 180 k readings 44.25 x 180/ 45.25 x 90 vertex distance= 12 mm the correct design of the CPC and power of a contact lens fitting 0. steeper than " K " would be - =Answer>> 44.75 - 3.
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🤔 Hybridgrades101@gmail.com RX -3.25 - 1.00 x 180 k readings 44.25 x 180/ 45.25 x 90 vertex distance= 12 mm the correct design of the CPC and power of a contact lens fitting 0. D flatter than " K " would be - =Answer>> 44.00 - 3. RX -3.25 - 1.00 x 180 k readings 44.25 x 180/ 45.25 x 90 vertex distance= 12 mm the correct design of the CPC and power of a contact lens fitting 0. D flatter the " K " would be - =Answer>> 43.75 - 2. the power of a contact lens is generally specified: - =Answer>> in back vertex power it is possible to assess the quality of the peripheral curves of a rigid contact lens through the use of the: - =Answer>> shadowgraph aka projection device a flourescein pattern with a rigid contact lens in place shows a narrow band horizontally, with a concentration of flourescein under the lens both inferiorly and superiorly. the type of astigmatism represented by this pattern is: - =Answer>> With the rule astigmatism the lens diameter, optic zone width, and peripheral curve width may be verified simultaneously through the use of: - =Answer>> measuring magnifier analysis or evaluation of which of the following will help determine the best contact lens diameter - =Answer>> triel lenses HVID dyer nomogram corneal topography
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🤔 Hybridgrades101@gmail.com the quality of the surface of a rigid contact lens may be inspected utilizing: - =Answer>> slit lamp measuring magnifier the health of the cornea in an RPG fitting is dependent upon which of the following - =Answer>> gas permeability of the lens lens/cornea relationship and movement the primary source of oxygen for the cornea is: - =Answer>> tears after being placed on the patient's cornea, it is observed that a soft contact lens is demonstrating "edge lift". this can be corrected by: - =Answer>> shortening the radius of the base curve the base curve of a rigid lens was ordered at 7.85 mm and was received measuring 7.95 mm. this lens is ____________ than ordered - =Answer>> 0.50 D flatter` concentric circles reflected off a patient's cornea can be evaluated using a: the corneal topographer is based on the principles of the: - =Answer>> placido disk when a rigid contact lens shows apical touch, this would indicate a: - =Answer>> a flat fit a rigid lens showing a band-shaped area of touch on the flattest corneal meridian - =Answer>> an astigmatic fit three point touch good centration adequate movement - =Answer>> a well fit soft contact lens in evaluating the fit of a pair of soft contact lenses with a keratometer, it is observed that the mires are blurry when the lenses are in place. however, after each blink the mires become clear
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🤔 Hybridgrades101@gmail.com temporarily, then turn blurry again. this pattern indicates: - =Answer>> a tight fitting lens an "ideal" fluorescein pattern for a spherical lens on a spherical cornea would show: - =Answer>> an even distribution of flourescein with added thickness under the peripheral curves your patient is wearing a rigid contact lens with a base curve of 42. and power of -3.25 D. the doctor over refracts -0.75 over this lens. if the final lens to be ordered will have a base curve of 42.25, what will its power have to be? - =Answer>> -3.75` in evaluating the fit of a soft contact lens with either keratometry mires or a retinoscopic reflex, distortion immediately following each blink is detected. this would be caused by: - =Answer>> a loose fitting lens with how much refractive astigmatism should a soft toric lens design be considered instead of a soft spherical lens - =Answer>> 0.75 D which of the following represents the best soft toric lens cadidates? - =Answer>> lenticular astigmatism, oblique astigmatism which method of stabilization works on the watermelon seed principle? - =Answer>> prism ballast which of the following is a true statement about toric contact lenses?
- =Answer>> the scribe marks are typically found in the 3 and 9, or 6 o'clock area when evaluating the rotation of a soft toric lens, which of the following is a true statement? - =Answer>> changes made to the axis are made to the spectacle axis how many degrees are representation by an hour on the face of a clock? - =Answer>> 30 degrees
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🤔 Hybridgrades101@gmail.com which slit lamp illumination provides an overall view with a wide beam that covers a large portion of the ocular surface? - =Answer>> diffuse which slit lamp illumination focuses light rays in one spot, while the observer looks in another area? - =Answer>> indirect which slit lamp illumination bounces light rays off of the iris so the area being studied is lit from behind? - =Answer>> Retroillumination which slit lamp illumination uses a 2 to 3 mm slit beam directed at the limbus at a 90 degree angle to the observer in order to bounce light rays through the cornea? - =Answer>> sclerotic scatter when evaluating fluorescein patterns, the more green that appears: - =Answer>> the more space there is between the lens and the cornea in that area when evaluating fluorescein patterns, the less green that appears: - =Answer>> the less space there is between the lens and the cornea in that area which care product is most responsible for removing surface debris from a contact lens? - =Answer>> daily cleaner daily cleaners should be used blank_ when the contact lenses are removed - =Answer>> immediately which of the following is the most commonly used soft lens disinfection system today? - =Answer>> chemical buffers are used in solutions to keep them in the range of: - =Answer>> 6-
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🤔 Hybridgrades101@gmail.com a low pH can cause high water content, ionic soft contact lenses to: - =Answer>> lose hydration reduces the level of microbial contamination to a safe level - =Answer>> disinfection this should still involve a digital rubbing of the lens surface - =Answer>> no rub solution neutralization is required with which of the following lens care systems? - =Answer>> oxidative it has 0.9% sodium chloride. it should be used instead of tap water to rinse contact lenses. it has a pH level between 7.0 and 7.4 - =Answer>> saline solution the average blink rate is: - =Answer>> 7-12 times per minute the meibomian glands secrete - =Answer>> lipids or oils the lining of the eyelids is called the: - =Answer>> palpebral conjunctiva the palpebral fissure averages: - =Answer>> 30 mm wide by 15 mm high the oily layer of the tear film: - =Answer>> helps to reduce evaporation of the tear film creates a smooth optical surface, provides a rinsing system for the ocular surface, offers the first line of defense against bacteria - =Answer>> functions of the tear film the average tear film pH is: - =Answer>> between 6.5 and 7. the tear film volume is approximately: - =Answer>> 5 to 10 microliters
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🤔 Hybridgrades101@gmail.com a break in the corneal epithelium is called - =Answer>> abrasion fleischer's ring, munson's sign, inferior corneal thinning - =Answer>> clinical sign's of keratoconus which of the following results in severe pain? - =Answer>> acanthamoeba keratitis three and nine o'clock staining is most often found in patients who: - =Answer>> wear GP lenses a yellowing, triangular thickening of bulbar conjunctiva that is very common as people age is called a: - =Answer>> pinguecula cold compress, reduced wearing of contact lenses, more frequent replacement of contact lenses - =Answer>> treatment option for GPC when a patient is pseudophakic, they have an: - =Answer>> IOL significant unequal refractive error between two eyes. an RX of OD +1.00 D/ OS +7.50 D is an example of a patient with: - =Answer>> Anisometropia the eyelids play an important role in the fitting and wear of contact lenses for which of the following reasons? - =Answer>> they effect the wettability of the lens surface. they effect the positioning of the lens. they are sensitive and generally cause most of the discomfort when a lens is first placed on the eye. small punctate stains on the corneal epithelium when seen under an ultraviolet light are most likely caused by - =Answer>> tight lenses after about four hours of wear, your patient complains that his eyes feel "hot". this may be an indication of: - =Answer>> too tight a lens
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🤔 Hybridgrades101@gmail.com three and nine o'clock staining is generally seen with: - =Answer>> rigid PMMA lenses a rigid gas permeable contact lens is causing a slight stagnation of tears over the corneal apex. one possible lens modification might be:
- =Answer>> to reduce the lens diameter when the fitter observes the occurrence of a neovascularization, the first course of action should be: - =Answer>> return the patient to the prescribing practitioner the slit lamp illumination most commonly used for detecting corneal edema is: - =Answer>> sclerotic scatter and the unaided eye limbal peripheral staining may indicate the possibility of: - =Answer>> corneal vascularization when an adapted contact lens patient manifests significantly increased scleral injection it would indicate - =Answer>> the need for medical attention during slit lamp evaluation, a hazy cornea is an indication of: - =Answer>> corneal edema focusing the beam of the slit lap directly on the limbus and observing the cornea without the use of the microscope is an excellent way to observe: - =Answer>> diffuse epithalial edema superficial punctate staining at the corneal apex combined with edema in this region might indicate: - =Answer>> a steep fit corneal staining as observed with a slit lamp maky - =Answer>> a foreign body poor insertion techniques poor edge design
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🤔 Hybridgrades101@gmail.com structures in the reflected light. this illumination is known as: - =Answer>> retro illumination following the installation of flourescein it is sometimes useful to use the ___ filter of the slit lamp to observe staining patterns. - =Answer>> cobalt blue the invasion of new blood vessels into the cornea is known as: - =Answer>> neovascularization conjunctival and episcleral injection can be caused by - =Answer>> toxic reactions to various contact lens solutions infectious conjunctivitis alterations in the integrity of the corneal epithelium caused by direct trauma when causing flourescein to aid in the evaluation of the fit of a rigid lens, a special filter must be used with: - =Answer>> flourcarbon contact lenses for the correction of aphakia have certain advantages over spectacle lenses. these include: - =Answer>> less peripheral aberration less magnification increased visual field a conical shaped cornea can be best fit with contact lenses through the use of: - =Answer>> trial lenses prism ballast lenses can be useful for: - =Answer>> helping to induce lens rotation for cylindrical lenses for some bifocals when there is at least 1.50 D of corneal astigmatism accompanied by a significant amount of residual astigmatism - =Answer>> Bitoric lenses
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🤔 Hybridgrades101@gmail.com K: 42.00 @ 180 / 42.00 @ 90 Rx: -1.25- 3.75 x 180 - =Answer>> front toric lens Rx 41.50 @90 / 42.75 @180 - =Answer>> against the rule Rx: -4.50 + 2.50 x 95 K: 44.75 @ 90 / 45.00 @ 180 - =Answer>> front toric contact lens early stages of keratoconus may be detected through the use of the: - =Answer>> keratometer the hyperflange lens design is useful in fitting which of the following?
- =Answer>> high minus lenses a patient who has been diagnosed as having keratoconus may present what during a slit lamp examination? - =Answer>> thinning of the corneal apex K: 42.50 @ 180 / 43.50 @ 90 Rx: -11.25 -0.75 x 180 which design should be considered? - =Answer>> hyperflange when fitting the keratoconus patient, which of the following lens styles could be considered? - =Answer>> asperic and Soper certain styles of bifocal contact lenses may rotate without vision impairment. one example of these would be: - =Answer>> annular when fitting a keratoconus patient, the lens should: - =Answer>> align the apex myoflange lenses for high plus prescriptions have the following advantages: - =Answer>> reduced center thickness and reduced weight how well a soft toric lens performs on the cornea depends on several factors. these would include: - =Answer>> tightness of the lid
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