BO PRACTICE TEST
A
2025-2026 | Updated
Questions & Answers | 100%
Correct | Optician Certification
Exam | Pass Guaranteed - A+
Graded
art I: Multiple Choice (Q1–Q100)
P
Q1 (Ophthalmic Optics): A patient's prescription is +2.00 –1.50 × 180. What is the power in the
90° meridian?
A. +0.50
B. +2.00
C. –1.50
D. +3.50
[CORRECT] A
Rationale: Per ABO competency standards, power at the axis meridian (180°) equals the sphere
power (+2.00). Power at 90° (perpendicular to axis) equals sphere plus cylinder: +2.00 + (–1.50)
= +0.50. Distractor B represents the axis power only; C is the cylinder power in isolation; D
incorrectly adds absolute values rather than algebraic sum. Memory tip: "Axis = sphere, 90°
away = sphere + cyl."
Q2 (Ophthalmic Optics): Which lens material has the highest index of refraction?
A. CR-39 (n = 1.498)
B. Polycarbonate (n = 1.586)
C. Trivex (n = 1.53)
D. 1.74 High-Index (n = 1.74)
[CORRECT] D
Rationale: The 2025/26 ABO blueprint emphasizes material properties; 1.74 high-index plastic
has the highest refractive index at 1.74, producing the thinnest lens profile for high prescriptions.
Distractor B (polycarbonate) is commonly confused as the highest due to its impact resistance
, rominence; A is standard plastic; C is mid-index with superior impact resistance but lower
p
n-value. Memory tip: "Higher n = thinner lens, but watch the Abbe trade-off."
Q3 (Ophthalmic Optics): A patient with a high prescription wants minimal chromatic aberration.
Which material should you recommend?
A. Polycarbonate (Abbe = 30)
B. 1.67 High-Index (Abbe = 32)
C. CR-39 (Abbe = 58)
D. 1.74 High-Index (Abbe = 33)
[CORRECT] C
Rationale: Chromatic aberration is inversely related to Abbe value; CR-39 has the highest Abbe
value (58) among options, producing the least chromatic aberration per ANSI Z80.1 material
standards. Distractor A (polycarbonate) is the worst offender; B and D are high-index materials
with inherently lower Abbe values. Memory tip: "High Abbe = happy eyes; CR-39 is the Abbe
champion."
Q4 (Ophthalmic Optics): What is the minimum center thickness required for a polycarbonate
lens per ANSI Z80.1 impact resistance standards?
A. 1.0 mm
B. 1.5 mm
C. 2.0 mm
D. 2.5 mm
[CORRECT] C
Rationale: ANSI Z80.1-202x requires a minimum 2.0 mm center thickness for polycarbonate
lenses to pass drop-ball impact testing; this applies to all dress eyewear claiming impact
resistance. Distractor A is below minimum; B is the old CR-39 minimum; D exceeds requirement
unnecessarily. Memory tip: "Poly = 2.0 mm for the go."
Q5 (Ophthalmic Optics): Using Prentice's Rule, what prism is induced when a +3.00 D lens is
decentered 4 mm temporally?
A. 1.2Δ base temporal
B. 1.2Δ base nasal
C. 0.75Δ base temporal
D. 2.0Δ base nasal
[CORRECT] B
Rationale: Prentice's Rule: Δ = c(cm) × D = 0.4 cm × 3.00 = 1.2Δ. For plus lenses, prism base is
opposite to decentration direction; temporal decentration induces base nasal prism. Distractor A
reverses the base direction; C fails to convert mm to cm; D uses incorrect formula. Memory tip:
"Plus = opposite, Minus = same; always convert mm to cm."
Q6 (Lensometry): When verifying a progressive addition lens (PAL) with the lensometer, where
should the optical center be positioned?
A. At the distance reference circle
B. At the prism reference point
C. At the fitting cross
D. At the near reference circle
[CORRECT] B
, ationale: Per ABO standards and manufacturer markings, the prism reference point (PRP) is
R
the designated location for verifying prism power and major reference point positioning on PALs.
Distractor A is for distance power verification; C indicates fitting height but not verification point;
D is for near power measurement. Memory tip: "PRP = Prism Reference Point = your
verification home base."
Q7 (Anatomy/Physiology): Which ocular structure is primarily responsible for refracting light
entering the eye?
A. Lens
B. Cornea
C. Retina
D. Aqueous humor
[CORRECT] B
Rationale: The cornea provides approximately two-thirds (≈43D) of the eye's total refractive
power due to its curved air-tissue interface; the lens provides adjustable fine-tuning (≈20D).
Distractor A is responsible for accommodation; C is neural tissue for phototransduction; D
maintains intraocular pressure but contributes minimal refraction. Memory tip: "Cornea does the
heavy lifting; lens adjusts the focus."
Q8 (Refraction/Prescription): Convert the following prescription to plus cylinder form: –3.00
+1.50 × 090.
A. –1.50 –1.50 × 180
B. –1.50 +1.50 × 180
C. –3.00 –1.50 × 180
D. –1.50 –1.50 × 090
[CORRECT] A
Rationale: Transposition steps per ABO standards: (1) New sphere = sum of sphere and
cylinder: –3.00 + 1.50 = –1.50; (2) New cylinder = opposite sign of original cylinder: –1.50; (3)
New axis = rotate 90°: 090 + 090 = 180. Distractor B maintains plus cylinder; C keeps original
sphere; D fails to rotate axis. Memory tip: "Sum, flip sign, rotate 90."
Q9 (Spectacle Fitting): A patient's monocular PD is 32 mm OD and 30 mm OS. What is the
binocular PD?
A. 30 mm
B. 32 mm
C. 62 mm
D. 64 mm
[CORRECT] C
Rationale: Binocular PD = monocular PD OD + monocular PD OS = 32 + 30 = 62 mm. This
measurement is critical for decentration calculations and optical center alignment. Distractor A
uses OS only; B uses OD only; D incorrectly adds 2 mm. Memory tip: "Binocular = both eyes
added together."
Q10 (ANSI Standards): Per ANSI Z80.1-202x, what is the horizontal prism tolerance for a single
vision lens with a power of ±2.00 D or less?
A. 0.33Δ
B. 0.50Δ
C. 0.67Δ
, . 1.00Δ
D
[CORRECT] C
Rationale: ANSI Z80.1-202x specifies 0.67Δ horizontal prism tolerance for single vision lenses
with power ≤±2.00 D; vertical tolerance is tighter at 0.33Δ. Distractor A is the vertical tolerance;
B is an intermediate distractor; D exceeds allowable tolerance. Memory tip: "Horizontal = 0.67,
Vertical = 0.33 for low powers."
Q11 (Ophthalmic Optics): What is the spherical equivalent of the prescription +4.00 –2.00 ×
045?
A. +2.00
B. +3.00
C. +4.00
D. +5.00
[CORRECT] B
Rationale: Spherical equivalent = sphere + (cylinder/2) = +4.00 + (–2.00/2) = +4.00 – 1.00 =
+3.00. This represents the average power of the spherocylindrical lens. Distractor A incorrectly
subtracts full cylinder; C ignores cylinder; D adds cylinder. Memory tip: "SE = sphere + half the
cyl."
Q12 (Instrumentation): When using a lensometer, you read +2.00 on the power drum with the
lens in standard position. The lens is:
A. Definitely a plus lens
B. Definitely a minus lens
C. Either plus or minus depending on vertex
D. A plano lens
[CORRECT] A
Rationale: In standard lensometer position (convex side toward patient/eye piece), a positive
power drum reading indicates a plus lens in plus cylinder notation; the instrument measures
vergence directly. Distractor B confuses with reversed position; C applies to vertex distance
effects, not lensometer readings; D contradicts the measured power. Memory tip: "Standard
position, positive reading = plus lens."
Q13 (Ophthalmic Optics): Which coating is primarily designed to reduce reflections from the
lens surfaces?
A. Scratch-resistant coating
B. Anti-reflective (AR) coating
C. UV coating
D. Mirror coating
[CORRECT] B
Rationale: Anti-reflective coatings use destructive interference via quarter-wavelength thickness
layers to cancel reflected light, improving transmittance to 99%+ per 2025/26 ABO optics
standards. Distractor A protects against abrasion; C blocks ultraviolet radiation; D increases
reflection for cosmetic purposes. Memory tip: "AR = Anti-Reflection = let the light through."
Q14 (Refraction/Prescription): In a prescription written in minus cylinder form, which meridian
has the most plus (or least minus) power?
A. The axis meridian
B. The meridian 90° from axis
A
2025-2026 | Updated
Questions & Answers | 100%
Correct | Optician Certification
Exam | Pass Guaranteed - A+
Graded
art I: Multiple Choice (Q1–Q100)
P
Q1 (Ophthalmic Optics): A patient's prescription is +2.00 –1.50 × 180. What is the power in the
90° meridian?
A. +0.50
B. +2.00
C. –1.50
D. +3.50
[CORRECT] A
Rationale: Per ABO competency standards, power at the axis meridian (180°) equals the sphere
power (+2.00). Power at 90° (perpendicular to axis) equals sphere plus cylinder: +2.00 + (–1.50)
= +0.50. Distractor B represents the axis power only; C is the cylinder power in isolation; D
incorrectly adds absolute values rather than algebraic sum. Memory tip: "Axis = sphere, 90°
away = sphere + cyl."
Q2 (Ophthalmic Optics): Which lens material has the highest index of refraction?
A. CR-39 (n = 1.498)
B. Polycarbonate (n = 1.586)
C. Trivex (n = 1.53)
D. 1.74 High-Index (n = 1.74)
[CORRECT] D
Rationale: The 2025/26 ABO blueprint emphasizes material properties; 1.74 high-index plastic
has the highest refractive index at 1.74, producing the thinnest lens profile for high prescriptions.
Distractor B (polycarbonate) is commonly confused as the highest due to its impact resistance
, rominence; A is standard plastic; C is mid-index with superior impact resistance but lower
p
n-value. Memory tip: "Higher n = thinner lens, but watch the Abbe trade-off."
Q3 (Ophthalmic Optics): A patient with a high prescription wants minimal chromatic aberration.
Which material should you recommend?
A. Polycarbonate (Abbe = 30)
B. 1.67 High-Index (Abbe = 32)
C. CR-39 (Abbe = 58)
D. 1.74 High-Index (Abbe = 33)
[CORRECT] C
Rationale: Chromatic aberration is inversely related to Abbe value; CR-39 has the highest Abbe
value (58) among options, producing the least chromatic aberration per ANSI Z80.1 material
standards. Distractor A (polycarbonate) is the worst offender; B and D are high-index materials
with inherently lower Abbe values. Memory tip: "High Abbe = happy eyes; CR-39 is the Abbe
champion."
Q4 (Ophthalmic Optics): What is the minimum center thickness required for a polycarbonate
lens per ANSI Z80.1 impact resistance standards?
A. 1.0 mm
B. 1.5 mm
C. 2.0 mm
D. 2.5 mm
[CORRECT] C
Rationale: ANSI Z80.1-202x requires a minimum 2.0 mm center thickness for polycarbonate
lenses to pass drop-ball impact testing; this applies to all dress eyewear claiming impact
resistance. Distractor A is below minimum; B is the old CR-39 minimum; D exceeds requirement
unnecessarily. Memory tip: "Poly = 2.0 mm for the go."
Q5 (Ophthalmic Optics): Using Prentice's Rule, what prism is induced when a +3.00 D lens is
decentered 4 mm temporally?
A. 1.2Δ base temporal
B. 1.2Δ base nasal
C. 0.75Δ base temporal
D. 2.0Δ base nasal
[CORRECT] B
Rationale: Prentice's Rule: Δ = c(cm) × D = 0.4 cm × 3.00 = 1.2Δ. For plus lenses, prism base is
opposite to decentration direction; temporal decentration induces base nasal prism. Distractor A
reverses the base direction; C fails to convert mm to cm; D uses incorrect formula. Memory tip:
"Plus = opposite, Minus = same; always convert mm to cm."
Q6 (Lensometry): When verifying a progressive addition lens (PAL) with the lensometer, where
should the optical center be positioned?
A. At the distance reference circle
B. At the prism reference point
C. At the fitting cross
D. At the near reference circle
[CORRECT] B
, ationale: Per ABO standards and manufacturer markings, the prism reference point (PRP) is
R
the designated location for verifying prism power and major reference point positioning on PALs.
Distractor A is for distance power verification; C indicates fitting height but not verification point;
D is for near power measurement. Memory tip: "PRP = Prism Reference Point = your
verification home base."
Q7 (Anatomy/Physiology): Which ocular structure is primarily responsible for refracting light
entering the eye?
A. Lens
B. Cornea
C. Retina
D. Aqueous humor
[CORRECT] B
Rationale: The cornea provides approximately two-thirds (≈43D) of the eye's total refractive
power due to its curved air-tissue interface; the lens provides adjustable fine-tuning (≈20D).
Distractor A is responsible for accommodation; C is neural tissue for phototransduction; D
maintains intraocular pressure but contributes minimal refraction. Memory tip: "Cornea does the
heavy lifting; lens adjusts the focus."
Q8 (Refraction/Prescription): Convert the following prescription to plus cylinder form: –3.00
+1.50 × 090.
A. –1.50 –1.50 × 180
B. –1.50 +1.50 × 180
C. –3.00 –1.50 × 180
D. –1.50 –1.50 × 090
[CORRECT] A
Rationale: Transposition steps per ABO standards: (1) New sphere = sum of sphere and
cylinder: –3.00 + 1.50 = –1.50; (2) New cylinder = opposite sign of original cylinder: –1.50; (3)
New axis = rotate 90°: 090 + 090 = 180. Distractor B maintains plus cylinder; C keeps original
sphere; D fails to rotate axis. Memory tip: "Sum, flip sign, rotate 90."
Q9 (Spectacle Fitting): A patient's monocular PD is 32 mm OD and 30 mm OS. What is the
binocular PD?
A. 30 mm
B. 32 mm
C. 62 mm
D. 64 mm
[CORRECT] C
Rationale: Binocular PD = monocular PD OD + monocular PD OS = 32 + 30 = 62 mm. This
measurement is critical for decentration calculations and optical center alignment. Distractor A
uses OS only; B uses OD only; D incorrectly adds 2 mm. Memory tip: "Binocular = both eyes
added together."
Q10 (ANSI Standards): Per ANSI Z80.1-202x, what is the horizontal prism tolerance for a single
vision lens with a power of ±2.00 D or less?
A. 0.33Δ
B. 0.50Δ
C. 0.67Δ
, . 1.00Δ
D
[CORRECT] C
Rationale: ANSI Z80.1-202x specifies 0.67Δ horizontal prism tolerance for single vision lenses
with power ≤±2.00 D; vertical tolerance is tighter at 0.33Δ. Distractor A is the vertical tolerance;
B is an intermediate distractor; D exceeds allowable tolerance. Memory tip: "Horizontal = 0.67,
Vertical = 0.33 for low powers."
Q11 (Ophthalmic Optics): What is the spherical equivalent of the prescription +4.00 –2.00 ×
045?
A. +2.00
B. +3.00
C. +4.00
D. +5.00
[CORRECT] B
Rationale: Spherical equivalent = sphere + (cylinder/2) = +4.00 + (–2.00/2) = +4.00 – 1.00 =
+3.00. This represents the average power of the spherocylindrical lens. Distractor A incorrectly
subtracts full cylinder; C ignores cylinder; D adds cylinder. Memory tip: "SE = sphere + half the
cyl."
Q12 (Instrumentation): When using a lensometer, you read +2.00 on the power drum with the
lens in standard position. The lens is:
A. Definitely a plus lens
B. Definitely a minus lens
C. Either plus or minus depending on vertex
D. A plano lens
[CORRECT] A
Rationale: In standard lensometer position (convex side toward patient/eye piece), a positive
power drum reading indicates a plus lens in plus cylinder notation; the instrument measures
vergence directly. Distractor B confuses with reversed position; C applies to vertex distance
effects, not lensometer readings; D contradicts the measured power. Memory tip: "Standard
position, positive reading = plus lens."
Q13 (Ophthalmic Optics): Which coating is primarily designed to reduce reflections from the
lens surfaces?
A. Scratch-resistant coating
B. Anti-reflective (AR) coating
C. UV coating
D. Mirror coating
[CORRECT] B
Rationale: Anti-reflective coatings use destructive interference via quarter-wavelength thickness
layers to cancel reflected light, improving transmittance to 99%+ per 2025/26 ABO optics
standards. Distractor A protects against abrasion; C blocks ultraviolet radiation; D increases
reflection for cosmetic purposes. Memory tip: "AR = Anti-Reflection = let the light through."
Q14 (Refraction/Prescription): In a prescription written in minus cylinder form, which meridian
has the most plus (or least minus) power?
A. The axis meridian
B. The meridian 90° from axis
