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Quizzes > Health & Medicine

Optician Practice Test: Check Your Optical Knowledge

Quick, free optical quiz to test your skills. Instant results for optician exam practice.

Editorial: Review CompletedCreated By: Andi Iqbal AkbarUpdated Aug 26, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration of eyeglasses lenses microscope eye chart for optical quiz on dark blue background

This optician practice test helps you check your optical skills in lens fitting, refraction, frame selection, and basic eye care. Use it to spot gaps before exams and refresh key terms, then explore an ophthalmology exam practice quiz, reinforce structures with an eye anatomy labeling quiz, or try a quick eye test quiz.

What does "20/20 vision" signify?
Seeing objects at 20 feet that are normally seen at 40 feet
Ability to see 20 letters on a vision chart
Normal visual acuity at 20 feet
The need for a -2.0 diopter correction
20/20 vision indicates the ability to see at 20 feet what the average person sees at that distance. It is the standard for normal visual acuity. A lower numerator or higher denominator indicates worse acuity. .
What unit is used to measure the optical power of a lens?
Diopter
Micron
Curie
Millimeter
Diopter is the unit of refractive power representing the reciprocal of focal length in meters. It defines how strongly a lens converges or diverges light. A 2 diopter lens has a focal length of 0.5 meters. .
What does the refractive index of a lens material describe?
How much the material slows down light compared to air
The color dispersion of the material
The ultraviolet absorption rate
The scratch resistance of the material
The refractive index indicates how light speed in a material compares to that in a vacuum; higher values mean light slows more. It affects lens thickness for a given prescription. Higher-index materials can produce thinner lenses. .
What is the average adult pupillary distance (PD)?
62 millimeters
42 millimeters
72 millimeters
52 millimeters
Average adult PD is about 62 mm; it varies between 54 and 70 mm for most adults. Accurate PD is essential for proper lens alignment. Incorrect PD can cause eyestrain and blurred vision. .
Which of the following is the most common refractive error worldwide?
Astigmatism
Hyperopia
Myopia
Presbyopia
Myopia, or nearsightedness, affects a majority of the global population. It occurs when the eye focuses images in front of the retina. Prevalence of myopia is increasing worldwide due to environmental factors. .
The sclera is the:
White outer coating of the eye
Colored part surrounding the pupil
Transparent inner layer
Clear front surface of the eye
The sclera is the opaque, fibrous, protective outer layer of the eyeball commonly called the white of the eye. It provides structural support and protection. It is continuous with the cornea at the limbus. .
What is the primary benefit of an anti-reflective (AR) coating on eyeglasses?
Adds color tint
Reduces glare and reflections
Increases lens strength
Blocks UVB only
AR coatings minimize surface reflections, improving light transmission and reducing glare. Users experience clearer, more comfortable vision, especially during nighttime driving. They also enhance cosmetic appearance by reducing lens shine. .
Which lens type is primarily used to correct presbyopia?
Cylindrical lens
Prism lens
Plus lens (convex)
Minus lens (concave)
Plus or convex lenses add optical power, helping presbyopic eyes focus on near objects. Presbyopia is age-related loss of accommodation. Convex lenses converge light rays to the retina. .
Prism diopters are used to measure:
Light deviation through a prism
Refractive index
Lens thickness
Pupillary distance
Prism diopters quantify the displacement of light by a prism; one prism diopter deviates a ray one centimeter per meter of distance. This measurement is essential for prescribing prism in glasses. It helps correct binocular vision disorders by shifting images. .
Cylinder lenses are prescribed to correct:
Astigmatism
Myopia only
Color blindness
Presbyopia
Cylinder lenses have differing powers in orthogonal meridians to correct astigmatism, which results from an irregularly shaped cornea or lens. They focus light onto the retina correctly. Proper axis alignment is critical for effective astigmatism correction. .
In contact lens fitting, the base curve refers to:
Material refractive index
Thickness at the lens center
Curvature of the back surface of the lens
Diameter of the lens
The base curve is the radius of curvature on the posterior surface of a contact lens, matching the cornea's curvature for comfort and fit. It's measured in millimeters; smaller numbers mean steeper curves. Incorrect base curve can lead to lens discomfort or movement. .
A progressive addition lens (PAL) provides:
Two distinct optical zones for distance and near vision
Fixed intermediate power only
Seamless gradient of increasing plus power for distance to near
Only distance correction
PALs offer a continuous prescription change from distance to intermediate to near vision without visible lines. They are popular for presbyopia due to cosmetic and functional benefits. They avoid image jump associated with lined bifocals. .
Which instrument is used to measure corneal curvature?
Ophthalmoscope
Phoropter
Keratometer
Slit lamp
A keratometer measures the anterior corneal curvature by analyzing reflected mires. It's critical for contact lens fitting and detecting corneal astigmatism. Accurate keratometry readings inform lens selection and fit. .
Spherical aberration in a lens results in:
Different focal points in two meridians
Distortion of straight lines
Peripheral light rays focusing at a different point than central rays
Color fringing around objects
Spherical aberration occurs because spherical lens surfaces don't focus peripheral rays at the same point as paraxial rays, causing image blur and decreased contrast. It impacts image quality, especially in low-light conditions when pupils dilate. Aspheric lens designs can reduce this aberration. .
Moving a spectacle lens away from the eye increases its effective power, which is known as:
Lens snap-back
Chromatic dispersion
Vertex distance effect
Prism adaptation
The vertex distance effect describes how the effective power of a lens changes when its distance from the eye changes. As distance increases, a plus lens becomes more powerful, and a minus lens less powerful. This is important for prescription adjustments between glasses and contact lenses. .
Which bifocal segment design features a flat top shape?
Round segment
Executive
Franklin
D-segment
The D-segment bifocal has a flat top (or "D") shape and is commonly used for reading. The flat-top design provides a larger reading zone. It is cosmetically favored for its smooth transition. .
In contact lenses, Dk/t refers to:
Tear exchange rate
Disinfection kill time
Diameter times thickness
Oxygen permeability of the lens material divided by thickness
Dk is the oxygen permeability of lens material; dividing by thickness (t) gives Dk/t, indicating how much oxygen reaches the cornea through the lens. Adequate Dk/t prevents hypoxia. Higher Dk/t values are preferred for extended wear lenses. .
Aspheric lenses are designed to:
Provide multifocal zones
Increase chromatic aberration
Add prism power
Reduce spherical aberration and produce a flatter profile
Aspheric lenses use non-spherical surfaces to correct peripheral spherical aberrations, improving clarity and allowing thinner, flatter lenses compared to standard spherical lenses. They offer better optics across the lens surface. Wearers experience sharper vision and lighter frames. .
According to Prentice's rule, prism power (P) equals:
Lens thickness (mm) × lens power (D)
Decentration (cm) × lens power (D)
Lens power (D) ÷ decentration (cm)
Decentration (mm) + lens power (D)
Prentice's rule states that P (prism diopters) equals decentration in centimeters times lens power in diopters. It helps calculate induced prism from lens fitting. Proper understanding prevents unwanted prismatic effects. .
A cylinder axis of 90 degrees indicates correction for which meridian?
No meridian
Oblique meridian
Horizontal meridian
Vertical meridian
An axis of 90° aligns the cylinder power vertically, indicating the vertical meridian requires correction; at 180° corresponds to horizontal meridian. Meridian orientation is critical for proper astigmatic correction. Axis notation ranges from 0 to 180 degrees. .
Which test measures the amplitude of accommodation?
Cover test
Tonometry
Perimetry
Push-up test
The push-up test measures the near point of accommodation by moving an object closer until blur occurs. It assesses the eye's focusing ability. Results vary with age and can indicate accommodative disorders. .
To transpose a prescription from plus to minus cylinder form, which of the following shows correct transposition of -2.00 +1.00 × 180?
-3.00 +1.00 × 90
-1.00 -1.00 × 90
-1.00 +1.00 × 90
-2.00 -1.00 × 180
Cylinder transposition adds the original cylinder power to the sphere power to get the new sphere, changes the cylinder sign, and rotates the axis by 90°. In this example, adding +1.00 D to -2.00 D yields -1.00 D sphere, cylinder becomes -1.00 D, and axis shifts from 180° to 90°. This ensures prescriptions suit different lens designs. .
How does pupil size affect depth of focus?
Pupil size has no effect
Depth of focus only depends on lens power
Larger pupil size increases depth of focus
Smaller pupil size increases depth of focus
A smaller aperture (pupil) increases depth of focus due to reduced peripheral aberrations, similar to a camera f-stop. Larger pupils reduce depth of focus and increase aberrations. This principle explains why vision sharpness changes in bright vs. dim conditions. .
For a thick lens, the back vertex power (Fv) is calculated by:
F1 × F2 - (n/t)
(F1 + F2) / [1 - (t/n) × F1 × F2]
F1 + F2 - (t/n) × F1 × F2
F1 + F2 + (t × n) × F1 × F2
The back vertex power of a thick lens equals the sum of the front and back surface powers minus the thickness in meters divided by the refractive index times their product. F1 is the front surface power, and F2 is the back surface power measured in diopters. This calculation corrects for separation of lens surfaces in high prescriptions. Accurate Fv is essential for precision eyewear design. .
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Study Outcomes

  1. Understand Refraction Principles -

    Grasp how light bends through lenses and apply core refraction concepts in optometry practice test questions.

  2. Apply Lens Fitting Techniques -

    Learn proper methods for selecting and adjusting lenses to ensure optimal vision correction and patient comfort.

  3. Analyze Optical Illusions -

    Explore common visual illusions and identify the underlying mechanisms in this optical quiz context.

  4. Recall Vision Science Fundamentals -

    Memorize essential eye anatomy and physiology concepts that underpin accurate eye care knowledge quiz responses.

  5. Evaluate Eye Care Scenarios -

    Assess real-world patient cases to determine best practices in eye health and optical solutions.

  6. Assess Knowledge Gaps -

    Identify your strengths and areas for improvement after taking the optician test to guide further study.

Cheat Sheet

  1. Refraction Fundamentals and Snell's Law -

    Review the core formula n₝·sin θ₝ = n₂·sin θ₂ to predict how light bends through different ocular media (Source: HyperPhysics, Georgia State University). Note that as refractive index increases, light deviates more toward the normal - crown glass (n≈1.52) bends light more than water (n≈1.33). Use the mnemonic "Air to Dense Bends In" to lock this principle into memory for your optician test.

  2. Corneal Topography & Lens Fitting -

    Understand how corneal curvature measurements, expressed as base curve radius and sagittal height, guide proper contact lens selection (Source: American Academy of Optometry). A flatter base curve yields looser fit while a steeper one increases vaulting - key for lens comfort and corneal health. Remember "Flatter Follows, Steeper Stands Off" when choosing trial lenses during an optical quiz.

  3. Spherical vs. Cylindrical Correction -

    Differentiating sphere (S) and cylinder (C) power is vital: sphere corrects uniform myopia or hyperopia, while cylinder addresses astigmatism at a specific axis (Source: Journal of Optometric Vision Development). Convert cross-cylinder data using J0 and J45 vectors if you encounter complex prescriptions. A quick trick: "Sphere Shapes, Cylinder Aligns" to recall their distinct roles on the optometry practice test.

  4. Pupillary Distance (PD) Measurement -

    Accurate PD, typically 55 - 65 mm in adults, ensures optical centers of lenses align with the eye's visual axis (Source: American Optometric Association). Use a millimeter ruler or a digital pupillometer and verify monocular PD for precise bifocal or progressive lens placement. In your eye care knowledge quiz, remember that a 1 mm error can introduce prismatic imbalance and visual discomfort.

  5. Optical Aberrations and Corrections -

    Familiarize yourself with common aberrations - spherical, chromatic and coma - that degrade image quality (Source: Optical Society of America). Aspheric lens designs reduce spherical aberration, while high-AD lenses and anti-reflective coatings minimize chromatic dispersion. Think "Aspheric Adapts, Coatings Cancel" to boost recall during vision science trivia.

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