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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:
**1. Read each question carefully.
- Answer all questions.
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- 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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NCLE National Contact Lens Examiners Review Exam 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: -
- The following is an example of what type of astigmatism? K's 44.00@180 / 44.50@ Rx -3.00 -2.50 x 180 A. Lenticular Astigmatism B. Against the Rule Astigmatism C. Irregular Astigmatism D. Oblique Astigmatism - =Answer>> A. Lenticular Astigmatism
- If a soft contact lens decenters laterally, exposing a portion of the patient's limbus, what change in parameter would improve this situation? A. Decreasing lens diameter B. Increase lens diameter C. Flatten base curve D. Steepen base curve - =Answer>> B. Increase lens diameter
- Which of the following is preservative found in soft contact lens solutions: A. Chlorbutanol B. Polyquad
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🤔 Hybridgrades101@gmail.com B. -2.50-1.00x C. -2.50-1.00X D. -2.50-1.00x010 - =Answer>> A. -2.50-1.00x
- Which of the following materials would least likely require a weekly enzymatic cleaner? A. Polymethylmethacrylate B. Hydrophilic C. Silicone D. Hydroxethyl - =Answer>> A. Polymethylmethacrylate
- What is the term for the condition in which there is loss of vision without any apparent disease to the eye? A. Amblyopia B. Aniridia C. Astigmatism D. Aphakia - =Answer>> A. Amblyopia
- Which term refers to a sensitivity to light? A. Prebyopia B. Photophobia C. Pannus D. Ptosis - =Answer>> B. Photophobia
- Which type of slit lamp illumination is used for observing tear break up time? A. Retro B. Diffuse C. Specular D. Sclerotic - =Answer>> B. Diffuse
- Thermal disinfection of soft lenses: A. Extend the life of the contacts since it kills microorganisms better than chemicals. B. Can be done by boiling the lens case in a pot of water for one hour if thermal disinfection is not available. C. Is effective against acanthamoeba cysts and trophozoites. D. Does not require prior cleaning with a surfactant since it kills microorganisms efficiently. - =Answer>> C. Is effective against acanthamoeba cysts and trophozoites. are beneficial when treating allergies and cold symptoms
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🤔 Hybridgrades101@gmail.com because they dry out the mucous membranes of the nasal passage. However, this may also lead to dehydration of the tear film, they are also been known to slow down the blink rate and increase corneal sensitivity. - =Answer>> antihistamines
- present when the keratometer readings are steeper in the horizontal meridian (42.50) than in the vertical meridian (40. @ 90) - =Answer>> against-the-rule astigmatism
- this is where the cornea receives nutrients from - =Answer>> aqueous humor, tears and limbal blood vessels
- the classic model of the pre-corneal tear film is composed of these layers - =Answer>> lipid, aqueous, mucin
- 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 x
- 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 x
- When a keratometer is being calibrated, which of the following targets will provide the most reliable result?
- a)the single-cut anterior surface of a high-plus lens
- b)a perfectly flat highly polished mirror
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🤔 Hybridgrades101@gmail.com b) giant-cell papillary conjunctivitis c) a lens fit that is too loose d) inability to wear soft lenses - =Answer>> a) solution reaction
- Which of the following is the mode of slit-lamp illumination used to view the early stages of microcystic edema? a) Retroillumination b) Direct illumination c) Parrallelpiped d) Oscillation - =Answer>> a) Retroillumination
- Which of the following changes is best able to improve oxygen transmissibility to a patient's cornea? a) Increasing tear exchange b) Increasing Dk c) Increasing optical zone diameter d) Increasing CN bevel - =Answer>> b) Increasing Dk
- In using fluorescein to evaluate the fit of a rigid lens of 9.0mm diameter on a typical eye, a correct statement is that: a) apical touch with pooling in the PPC curve area is preferred b) apical toxicity may not be obvious c) apical pooling with edge touch is recommended d) apical area, mid-peripheral area, and the lens edges should be assessed - =Answer>> d) apical area, mid- peripheral area, and the lens edges should be assessed
- Which of the following changes would improve a rigid contact lens fit that shows sluggish movement after 1 hour of wear?
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🤔 Hybridgrades101@gmail.com a) Add hyperflange edge treatment b) Reduce overall diameter c) Decrease center thickness d) Increase overall diameter - =Answer>> b) Reduce overall diameter
- Moving a +7.50 RX from the spectacle plane to the corneal plane will require: a) no change in power b) more minus power c) more plus power d) less plus power - =Answer>> c) more plus power
- A fluorescein pattern that has a black area over the corneal apex and a diffuse green area in the periphery normally indicates: a) flat fit b) steep fit c) normal fit d) tight fit - =Answer>> a) flat fit
- IPC's are used to: a) provide a transition between the peripheral and base curves b) reduce edge thickness and lens mass c) increase the optical zone d) smooth the lens edge - =Answer>> a) provide a transition between the peripheral and base curves
- A toric soft lens with an RX of -2.00 -1.25 x 120 has the axis resting at the 5 o' clock position. What should the new axis be when the lens is ordered? a) 90 degrees
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🤔 Hybridgrades101@gmail.com b) spherical gas permeable lenses c) spherical soft lenses d) toric gas permeable lenses - =Answer>> a) soft toric lenses
- Which of the following instruments is most commonly used to measure the diameter of the optical zone of a contact lens? a) contactometer b) radiuscope c) measuring magnifyer d) lensometer - =Answer>> c) measuring magnifyer
- According to the US Food and Drug Administration, the maximum time allowable for continuous wearing of silicone hydrogel lenses is: a) 7 days b) 14 days c) 21 days d) 30 days - =Answer>> d) 30 days
- When ridig lenses are received from the manufacturer, which of the following instuments is not needed for inspection and verification? a) biomicroscope b) radiuscope c) lensometer d) measuring magnifyer - =Answer>> a) biomicroscope
- When using a lid manipulation to assist in "popping" a rigid lens off the eye, the wearer should first make sure that the: a) lower lid meets the lower part of the cornea b) lens is resting on the cornea, where the fissure is widest
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🤔 Hybridgrades101@gmail.com c) edge of the lens has been located with a penlight d) lens is resting on the sclera, where the tissue is widest - =Answer>> b) lens is resting on the cornea, where the fissure is widest
- The most effective way to remove a soft contact lens that has adhered to the cornea is to: a) firmly press the lids against the sclera with fingertips, release, then blink the lid closed firmly b) gently pinch the lens directly off the cornea with clean fingertips c) affix a suction cup to the center of the lens and pull it straight away, using steady pressure d) irrigate the eye with lubricant until the lens moves freely, then remove as usual - =Answer>> d) irrigate the eye with lubricant until the lens moves freely, then remove as usual
- Following the fitting and dispensing of any continuous wear contact lenses, it is advisable to see the patient: a) the following morning b) in 2 weeks c) within 2 days d) in 1 week - =Answer>> a) the following morning
- The fitter can differientiate between a back toric lens and bitoric lens by utilizing a: a) radiuscope b) keratometer c) profile analyzer d) lensometer - =Answer>> a) radiuscope
- The instrument designed primarily to measure the base curve of a contact lens is the:
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🤔 Hybridgrades101@gmail.com d) a back surface curve that flattens progressively - =Answer>> b) one continuous curve throughout the optical zone
- Which layer of the tear film helps to prevent evaporation? a) vitreous layer b) lipid layer c) mucin layer d) aqueous layer - =Answer>> b) lipid layer
- Soft lenses should be considered when the patient: a) wants the best possible vision at all times b) is concered with cost c) desires intermittent wear d) has a small palpebral fissure - =Answer>> c) desires intermittent wear
- Which of the following characteristics is most likely to be exhibited by a diabetic contact lens patient? a) exophthalmos b) blepharitis c) fluctuating vision d) poor blink habits - =Answer>> c) fluctuating vision
- A rigid contact lens used to enhance color vision in patients who have color deficiencies is: a) light green b) dark red c) medium yellow d) dark blue - =Answer>> b) dark red
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- Upon completion of a contact lens fitting, the best way to provide additional information to the patient on fees, care systems, and wearing schedules is by: a) directing the patient to consult online reference material b) discussing such matters with the patient by telephone, as the need arises c) supplying the patient with pamphlets and office handouts d) asking the patient to bring up any questions at the next regular visit - =Answer>> c) supplying the patient with pamphlets and office handouts
- A patient complains of pain upon lens insertion, with excessive tearing and blurry vision. Fluorescein evaluation reveals zigzag linear corneal staining. These signs and symptoms are most likely due to a: a) tight-fitting lens b) solution sensitivity reaction c) loose-fitting lens d) foreign body under the lens - =Answer>> d) foreign body under the lens
- The Fairness to Contact Lens Consumers Act covers: a) GP lenses only b) specialty lenses only c) disposable lenses only d) all types of lenses - =Answer>> c) disposable lenses only
- When a soft diagnostic lens is too flat, it may demostrate: a) limited movement b) impingement on the limbus
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- In order to check the front vertex power of a contact lens, the lens should be placed in which of the following positions relative to the aperture of the lensometer a) concave side to the aperture b) 5 mm in front of the aperture c) peripheral curve opposite the aperture d) convex side to the aperture - =Answer>> d) convex side to the aperture
- It is recommended that after successful initial follow-up visits, the continuous/extended wear contact lens patient should be seen: a) monthly, late in the day after a full week of wear b) semiannually, as soon as possible after awakening c) annually, when the lenses are ready to be replaced d) every 18 months, even if no problems are obvious - =Answer>> b) semiannually, as soon as possible after awakening
- Fluorescein that has been instilled into the eye is best illuminated by using: a) sclerotic scatter b) a green filter c) cobalt blue filter d) a pen light - =Answer>> c) cobalt blue filter
- A patient complains of reduced vision after a well-fitted rigid lens has been polished by the fitter. The fitter should: a) check the quality of all lens parameters b) repolish the lens c) re-edge the lens
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🤔 Hybridgrades101@gmail.com d) reduce the lens diameter - =Answer>> a) check the quality of all lens parameters
- When an office visit is documented in a patients records, the final notation on the chart should be the: a) patients "K" readings b) patients overall satisfaction with the contact lenses c) recommended time until the patients next office visit d) results of the patients visual acuity assesment - =Answer>> c) recommended time until the patients next office visit
- Bedewing of the cornea occurs on which of the following corneal layers? a) Bowman's membrane b) Epithelium c) Endothelium d) Descemet's membrane - =Answer>> c) Endothelium
- Reducing the diameter of a minus lens results in: a) increased center thickness b) a reduction in weight c) a steeper base curve d) decreased center thickness - =Answer>> b) a reduction in weight
- To ensure follow-up recall appointments, it is important to: a) give an appointment a year in advance b) rely on the patient to schedule the follow up appointments c) send a note saying that it is not possible to replace a lens unless an appointment is scheduled in advance
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🤔 Hybridgrades101@gmail.com d) epithelial splitting - =Answer>> d) epithelial splitting
- With regard to a contact lens examination, the acronym SOAP stands for a) Symptomatology, Over-refraciton, Anatomy, Physiolofy b) Systemic disease, ocular disease, astigmatism, presbyopia c) Sensitivity, Ophthalmometry, Acuity, Pathology d) Subjective, Objective, Assessment, Plan - =Answer>> d) Subjective, Objective, Assesment, Plan
- Which part of the eye is most sensitive to a rigid corneal contact lens during the adaption period? a) Lid b) Sclera c) Limbus d) Conjunctiva - =Answer>> a) Lid
- A GP lens wearer reports a scratchy feeling upon lens insertion; the discomfort increases with wearing time. The most likely correction would be: a) changing the care regimen b) removing the CN bevel c) blending the junction zone d) decreasing the total lens diameter - =Answer>> c) blending the junction zone
- If a soft lens wearer complains of awareness of the lens in the right eye only, and the right and left parameters are identical, which of the following would be best for the fitter to do first?
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🤔 Hybridgrades101@gmail.com a) Put the lens in the right eye to see if the feeling subsides or alternates b) Switch to a steeper lens on the right eye only c) Order new lenses to see if the feeling subsides d) Discontinue use of the lenses for 24 hours and order a new right lens only - =Answer>> a) Put the lens in the right eye to see if the feeling subsides or alternates
- The goal of Occupational Safety Health and Administration(OSHA) is to: a) eliminate work hazards through training in safety and the use of personal protective equipment b) develop and enforce environmental regulations c) develop and carry out eyewear safety tests and to certify eyewear for use in specific situations d) ensures that foods, drugs, and medical devices are safe and effective - =Answer>> a) eliminate work hazards through training in safety and the use of personal protective equipment
- A patient who is wearing a GP lens complains of a "scratching sensation" The lens specifications are found to be accurate. Which of the following instruments would be most valuable in determining the cause of the discomfort? a) Measuring magnifier b) Topogometer c) Thickness gauge d) Radiuscope - =Answer>> a) Measuring magnifier
- A contact lens wearer presents with acute red eyes. The fitter would most likely ask the patient: a) Do you always wash your hand before inserting your lenses b) What lens care products have you been using
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