100+ Free NCLE Advanced Practice Questions

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Question 1

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A patient presents with a history of penetrating keratoplasty (corneal transplant) performed 18 months ago. Which contact lens type is MOST appropriate as a first-line option for visual rehabilitation?

Standard soft spherical lens

Large-diameter scleral lens

Daily disposable toric lens

Conventional RGP corneal lens

to track

2026 Statistics

Key Facts: NCLE Advanced Exam

125

Exam Questions

100 scored + 25 pretest

3 hrs

Time Limit

Computer-based exam

42%

Pass Rate (2024)

ABO-NCLE

$225

Exam Fee

Non-refundable

3 yrs

Experience Required

One NCLE recertification period

192

Currently Certified

NCLE-AC holders

The NCLEAC exam has 125 questions (100 scored + 25 pretest) with a 3-hour time limit. Passing is based on a criterion-referenced scaled score. The 2024 pass rate was 42%. Prerequisites include active basic NCLE certification plus one completed 3-year recertification period. The exam fee is $225 (non-refundable). Testing is available at Prometric centers or via remote proctor in approved states.

Sample NCLE Advanced Practice Questions

Try these sample questions to test your NCLE Advanced exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A patient presents with a history of penetrating keratoplasty (corneal transplant) performed 18 months ago. Which contact lens type is MOST appropriate as a first-line option for visual rehabilitation?

A.Standard soft spherical lens

B.Large-diameter scleral lens

C.Daily disposable toric lens

D.Conventional RGP corneal lens

Explanation: Large-diameter scleral lenses are the preferred first-line option for post-penetrating keratoplasty patients because they vault completely over the irregular corneal surface and graft-host junction, providing a smooth optical surface with a fluid reservoir. Standard soft lenses cannot mask the irregular astigmatism. Daily disposable torics only correct regular astigmatism. Conventional RGP corneal lenses may bear on the graft-host junction and risk graft rejection or discomfort.

2During a scleral lens fitting, the practitioner observes central bearing (touch) on the cornea after lens settling. What is the MOST appropriate modification?

A.Decrease the overall diameter

B.Increase the sagittal depth (vault)

C.Flatten the base curve

D.Reduce the haptic landing zone

Explanation: Central bearing indicates insufficient vault over the cornea. Increasing the sagittal depth provides more clearance between the lens back surface and the corneal apex, eliminating the touch. Decreasing diameter would reduce vault. Flattening the base curve would also reduce central vault. Reducing the haptic landing zone would affect peripheral fit but not resolve central bearing.

3What is the primary mechanism by which orthokeratology (ortho-K) lenses reduce myopia?

A.They permanently reshape the corneal stroma

B.They temporarily flatten the central corneal epithelium through hydraulic forces

C.They increase the refractive index of the tear film

D.They compress the anterior chamber depth

Explanation: Orthokeratology works by using reverse-geometry lens design to create hydraulic forces under the lens that redistribute the central corneal epithelium, temporarily flattening the central cornea and steepening the mid-periphery. This reduces myopic refractive error. The effect is on the epithelium, not the stroma, and it is reversible — not permanent. The tear film and anterior chamber are not the mechanisms of action.

4A keratoconus patient has a steep K reading of 52.00 D and a flat K of 46.00 D. What grade of keratoconus does this MOST likely represent?

A.Forme fruste (subclinical)

B.Mild keratoconus

C.Moderate keratoconus

D.Advanced (severe) keratoconus

Explanation: Moderate keratoconus is typically characterized by K readings between 45.00 and 52.00 D with visible corneal thinning and Vogt's striae. The steep K of 52.00 D with 6.00 D of corneal astigmatism places this in the moderate category. Forme fruste has K readings below 45.00 D with no clinical signs. Mild keratoconus typically has K readings of 45-48 D. Advanced keratoconus typically shows K readings exceeding 55 D with Munson's sign or corneal scarring.

5Which tear film layer is MOST critical to evaluate before fitting a scleral lens?

A.The lipid layer produced by meibomian glands

B.The aqueous layer produced by the lacrimal gland

C.The mucin layer produced by goblet cells

D.The glycocalyx produced by corneal epithelial cells

Explanation: The aqueous layer is most critical for scleral lens fitting because scleral lenses rely on a fluid reservoir (tear pool) between the lens and cornea. Adequate aqueous tear production ensures the post-lens tear reservoir remains filled and provides oxygen transport to the cornea. Patients with severe aqueous deficiency may experience corneal desiccation under the lens. While the lipid layer, mucin layer, and glycocalyx are all important for overall tear function, the aqueous component directly affects the scleral lens fluid reservoir.

6In a reverse-geometry orthokeratology lens design, the secondary (reverse) curve is:

A.Flatter than the base curve to create a bearing zone

B.Steeper than the base curve to create a tear reservoir

C.The same radius as the base curve for uniform pressure

D.Aspheric to match the corneal eccentricity

Explanation: In a reverse-geometry ortho-K lens, the secondary (reverse) curve is significantly steeper than the flat base curve, creating a deep tear reservoir zone between the central treatment (base curve) zone and the alignment zone. This reverse curve generates the hydraulic forces needed to redistribute the corneal epithelium. The base curve is fitted flatter than the flattest K to create the central flattening effect, while the steep reverse curve creates negative pressure (suction) that aids epithelial redistribution.

7A prosthetic contact lens is indicated for all of the following conditions EXCEPT:

A.Iris coloboma causing photophobia

B.Corneal scar with cosmetic disfigurement

C.Active bacterial keratitis with mucopurulent discharge

D.Aniridia with glare sensitivity

Explanation: Active bacterial keratitis with mucopurulent discharge is a contraindication for any contact lens wear, including prosthetic lenses, because the lens could trap infectious material against the cornea and worsen the infection. Prosthetic lenses are indicated for iris coloboma (to reduce photophobia by creating an artificial pupil), corneal scars (to improve cosmetic appearance), and aniridia (to reduce glare by providing an artificial iris). The infection must be fully resolved before considering any lens fitting.

8When evaluating a scleral lens fit using anterior segment OCT, what is the IDEAL central corneal clearance immediately after lens insertion?

A.50-100 micrometers

B.200-300 micrometers

C.400-600 micrometers

D.800-1000 micrometers

Explanation: The ideal initial central corneal clearance for a scleral lens immediately after insertion is approximately 200-300 micrometers. This allows for the expected settling (typically 50-100 micrometers over 4-8 hours) while maintaining adequate clearance at the end of the wearing period (approximately 100-200 micrometers). Less than 100 micrometers risks corneal touch. More than 600 micrometers can cause lens fogging (midday fogging), reduced oxygen transmissibility, and fluid reservoir stagnation.

9Which corneal topography pattern is MOST characteristic of keratoconus?

A.Symmetric bow-tie pattern

B.Inferior steepening with a displaced apex

C.Central island of flattening

D.Uniform spherical curvature

Explanation: Keratoconus characteristically shows inferior steepening with a displaced corneal apex on topography, often described as an asymmetric inferior bow-tie or skewed radial axis pattern. The I-S value (inferior minus superior dioptric power difference) is a key diagnostic metric. A symmetric bow-tie indicates regular astigmatism (with-the-rule or against-the-rule). Central flattening would suggest post-refractive surgery or ortho-K wear. Uniform spherical curvature indicates a normal cornea.

10A patient wearing a piggyback lens system (RGP over soft lens) reports fluctuating vision. What is the MOST likely cause?

A.The RGP lens is decentering on the soft carrier lens

B.The soft lens base curve is too steep

C.The patient has accommodative spasm

D.The RGP lens has protein deposits

Explanation: In a piggyback system, the most common cause of fluctuating vision is the RGP lens decentering or moving excessively on the soft carrier lens. The soft lens provides a smoother, more comfortable platform but may allow the RGP to slide if the soft lens fit or surface characteristics do not provide adequate stability. A steep soft lens would cause tightness rather than decentration. Accommodative spasm is unlikely in an established wearer. While deposits can reduce vision, they cause consistent blur rather than fluctuation.

About the NCLE Advanced Exam

The NCLE Advanced Certification (NCLE-AC) validates advanced-level knowledge and skills for contact lens technicians working with specialty lenses, complex ocular conditions, and post-surgical patients. Administered by ABO-NCLE, the NCLEAC exam covers scleral lens fitting, orthokeratology, keratoconus management, hybrid and piggyback systems, prosthetic lenses, and advanced troubleshooting.

Questions

125 scored questions

Time Limit

3 hours

Passing Score

Scaled (criterion-referenced)

Exam Fee

$225 (ABO-NCLE (American Board of Opticianry & National Contact Lens Examiners))

NCLE Advanced Exam Content Outline

25%

Prefit, Preparation & Evaluation

Complex ocular history documentation, specialty lens candidacy assessment, keratometry and topography interpretation, tear film evaluation, and patient needs analysis

30%

Design, Fit & Dispense Specialty Lenses

Scleral lens design and fitting, orthokeratology, hybrid and piggyback systems, custom soft lenses, prosthetic lenses, and specialty toric designs

15%

Patient Education & Lens Delivery

Specialty lens insertion and removal training, scleral lens filling solutions, wear and care instructions, and follow-up scheduling

25%

Routine & Emergency Follow-up

Evaluating complex lens fit and performance, lens modification strategies, compliance review, acute complication recognition, and triage protocols

Administrative Procedures

Contact lens environment safety, professional and ethical compliance, HIPAA and legal guidelines, patient record maintenance

How to Pass the NCLE Advanced Exam

What You Need to Know

Passing score: Scaled (criterion-referenced)
Exam length: 125 questions
Time limit: 3 hours
Exam fee: $225

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NCLE Advanced Study Tips from Top Performers

1Focus heavily on scleral lens design and fitting — this is the largest tested specialty lens category in the Design domain (30%)

2Master the SOAP documentation method (Subjective, Objective, Assessment, Plan) for complex patient case management

3Study keratoconus grading scales, corneal topography maps, and how they guide specialty lens selection

4Know the differences between piggyback, hybrid, and scleral lens systems and when each is indicated

5Review orthokeratology lens design principles, patient selection criteria, and monitoring protocols

6Practice identifying acute contact lens complications and proper triage protocols — this carries 6% of the exam weight alone

Frequently Asked Questions

What is the NCLE Advanced (NCLE-AC) certification?

NCLE Advanced Certification (NCLE-AC or NCLEAC) is an advanced credential from the American Board of Opticianry & National Contact Lens Examiners (ABO-NCLE) for experienced contact lens technicians. It validates advanced knowledge in specialty contact lens fitting, including scleral lenses, orthokeratology, keratoconus management, and post-surgical lens care. Only 192 professionals currently hold this designation.

What are the prerequisites for the NCLE Advanced exam?

You must hold an active basic NCLE certification (CLRE) and have completed at least one full 3-year recertification period. Alternatively, candidates with an opticianry degree can take the advanced exam any time after passing the basic NCLE exam. Some state licensing boards may have additional requirements.

How many questions are on the NCLE Advanced exam?

The NCLEAC exam contains 125 multiple-choice questions: 100 are scored and 25 are unscored pretest items used for future exam development. You cannot identify which questions are pretest, so treat every question seriously. The exam covers 5 domains with the heaviest emphasis on specialty lens fitting (30%) and follow-up care (25%).

What is the passing score for the NCLE Advanced exam?

The NCLEAC uses a criterion-referenced scaled scoring system rather than a fixed percentage. The passing score is determined through a psychometric standard-setting process. In 2024, the pass rate was 42%, making it one of the more challenging opticianry exams. Candidates receive a score report after testing.

What topics are covered on the NCLE Advanced exam?

The NCLEAC covers 5 domains: Prefit, Preparation & Evaluation (25%) including complex ocular conditions; Design, Fit & Dispense Specialty Lenses (30%) including scleral, hybrid, orthokeratology, and prosthetic lenses; Patient Education & Lens Delivery (15%); Routine & Emergency Follow-up (25%) including complication triage; and Administrative Procedures (5%).

How much does the NCLE Advanced exam cost?

The NCLEAC exam registration fee is $225, which is non-refundable once payment is submitted. This covers one exam attempt at a Prometric testing center or via remote proctor. If you need to retake the exam, you must register and pay the full $225 fee again in a subsequent testing window.

How is the NCLE Advanced exam administered?

The NCLEAC is a computer-based exam administered at Prometric testing centers or via Prometric's ProProctor remote proctoring system. The exam is given in English only. Testing windows are quarterly (Jan-Mar, Apr-Jun, Jul-Sep, Oct-Dec) with registration deadlines approximately 2 weeks before the window closes. Remote proctoring is available in approved states.

How long should I study for the NCLE Advanced exam?

Most candidates should plan 3-6 months of focused study, depending on experience level. Given the 42% pass rate, thorough preparation is essential. Focus on specialty lens fitting (scleral, orthokeratology, hybrid systems), complex ocular conditions (keratoconus, post-surgical), and advanced troubleshooting. Hands-on clinical experience significantly improves exam readiness.

What is the difference between NCLE Basic and NCLE Advanced?

The basic NCLE (CLRE) tests entry-level contact lens knowledge including standard soft and RGP fitting. The NCLE Advanced (NCLEAC) tests advanced specialty lens knowledge including scleral lenses, orthokeratology, keratoconus management, hybrid and piggyback systems, prosthetic lenses, and complex post-surgical fitting. The advanced exam has a much lower pass rate (42% vs higher for basic) and requires 3+ years of certified experience.