ABO-NCLE Advanced Opticianry Certification

A patient presents with a prescription of -8.00 -2.00 x 180. Which lens material would BEST minimize edge thickness and weight?

• ACR-39 (n=1.50)
• BPolycarbonate (n=1.586)
• CHigh-index 1.74
• DTrivex (n=1.53)

Using Prentice's Rule, what is the induced prism when a patient's pupil is decentered 4 mm below the optical center of a +5.00 D lens?

• A1.0 prism diopters base down
• B2.0 prism diopters base down
• C2.0 prism diopters base up
• D0.5 prism diopters base up

What does the Abbe value of a lens material indicate?

• AThe impact resistance of the material
• BThe degree of chromatic aberration produced by the material
• CThe UV absorption capability
• DThe scratch resistance of the material

A patient wearing progressive lenses reports blurred vision when looking through the intermediate zone at their computer. Which adjustment would MOST likely resolve this complaint?

• AIncrease the pantoscopic tilt to 25 degrees
• BVerify and adjust the fitting height so the progressive corridor aligns with the patient'…
• CReduce the base curve of the lenses
• DSwitch to single vision distance lenses

Which ophthalmic formula is used to calculate the focal length of a lens when the dioptric power is known?

• APrentice's Rule: prism = decentration x power
• BFocal length (m) = 1 / Dioptric power (D)
• CMartin's formula for tilt
• DLensmaker's equation

Martin's formula for lens tilt shows that tilting a spherical lens induces unwanted cylinder power. What is the effect of increasing pantoscopic tilt on a minus spherical lens?

• AIt induces plus cylinder at axis 180
• BIt induces minus cylinder at axis 180
• CIt has no effect on cylinder
• DIt converts the lens to a prism-only correction

Which condition results from a significant difference in refractive error between the two eyes, causing a perceived difference in image size?

• AAmblyopia
• BAniseikonia
• CAnisometropia
• DPresbyopia

A patient has a prescription of +3.00 -1.50 x 090. What is this prescription in minus cylinder form after flat transposition?

• A+1.50 +1.50 x 180
• B+3.00 -1.50 x 090
• C+1.50 +1.50 x 090
• D+4.50 -1.50 x 180

Which type of lens design uses free-form digital surfacing technology to optimize the lens surface point by point?

• AConventional flat-top bifocal
• BStandard progressive addition lens
• CDigitally surfaced (free-form) lens
• DExecutive bifocal

What is the minimum blank size formula used to determine the smallest lens blank that can be used for a given frame and decentration?

• AMBS = ED + (2 x total decentration per eye)
• BMBS = A + DBL + PD
• CMBS = frame PD - patient PD
• DMBS = ED x refractive index

Which type of wavefront aberration causes a point source of light to appear as a comet-shaped blur?

• ASpherical aberration
• BComa
• CTrefoil
• DDefocus

For a patient with anisometropia of 3.00 D between the two eyes, which lens solution would BEST minimize aniseikonia?

• AUse the same lens material and thickness for both eyes
• BFit contact lenses instead of spectacles
• CUse high-wrap frames
• DIncrease vertex distance equally for both eyes

What is the purpose of anti-reflective (AR) coating on ophthalmic lenses?

• ATo increase the scratch resistance of the lens surface
• BTo reduce surface reflections and improve light transmission through the lens
• CTo block 100% of ultraviolet radiation
• DTo darken the lens in sunlight

Which instrument is used to measure the back vertex power of a finished ophthalmic lens?

• AKeratometer
• BLensometer (focimeter)
• CPupilometer
• DPhoropter

A patient's prescription reads +2.50 -1.00 x 060 with 2 prism diopters base down. When verifying the lens on a lensometer, which reading would confirm correct prism?

• AThe target is centered on the crosshairs with no displacement
• BThe target is displaced 2 mm toward the bottom of the lensometer scale
• CThe target is displaced so the prism reading shows 2 prism diopters base down at the appr…
• DThe target shows 2 prism diopters base up

Compared with a longer corridor, what does a shorter progressive lens corridor do?

• ABuilds power more slowly and is less sensitive to head movement
• BRemoves the need to check that the frame leaves room for every zone
• CBuilds power faster and is more sensitive to head and eye movement
• DEliminates the peripheral distortion of a progressive lens

What is the primary advantage of aspheric lens designs compared to conventional spherical lens designs?

• ALower cost of production
• BFlatter, thinner profile with reduced magnification and peripheral aberrations
• CGreater impact resistance
• DEasier to edge and mount