TheoryFree EMT Practice Test
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EMT Questions
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Q1Which frame material is known for being the lightest commonly used in ophthalmic frames?
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✓ Correct answer: Titanium
Titanium is one of the lightest metals used in ophthalmic frames, offering an excellent strength-to-weight ratio. This makes it ideal for patients sensitive to heavy eyewear.
Q2Zyl (cellulose acetate) frames are best adjusted using which method?
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✓ Correct answer: Warm air or salt pan heating
Zyl frames must be heated before adjustment to prevent cracking or breaking. A warm-air frame heater or salt pan softens the material so it can be bent without damage.
Q3A patient with a nickel allergy should be steered away from which frame material?
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✓ Correct answer: Monel
Monel is a nickel-copper alloy and contains significant nickel content, making it unsuitable for patients with nickel sensitivity. Titanium and beta-titanium are nickel-free alternatives.
Q4Which frame material is most commonly used for rimless and semi-rimless mountings because of its high tensile strength?
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✓ Correct answer: Titanium
Titanium's high tensile strength allows it to withstand the stresses of drill-mount and rimless designs without cracking around the lens holes. It is the dominant metal for rimless mountings.
Q5Optyl is a proprietary epoxy resin frame material. What is its primary advantage over standard cellulose acetate?
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✓ Correct answer: It has shape-memory and returns to its original form when reheated
Optyl's cross-linked epoxy structure gives it thermal shape-memory: when reheated it returns to the factory shape. This is a key adjustment consideration — overcorrection can be undone simply by reheating.
Q6In the boxing system, what does the 'A measurement' represent?
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✓ Correct answer: The horizontal width of the lens opening
The A measurement (also called the eye size) is the horizontal width of the lens opening measured in the boxing system. It is one of the three key frame measurements (A, B, DBL).
Q7The distance between lenses (DBL) is measured from which points?
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✓ Correct answer: Nearest inner edges of each lens opening
The DBL (distance between lenses) is measured from the nearest inner edge of one lens opening to the nearest inner edge of the other lens opening. It defines the bridge span.
Q8A frame has an A measurement of 52 mm, a DBL of 18 mm, and a temple length of 140 mm. What is the total frame width (A + DBL + A)?
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✓ Correct answer: 122 mm
Total frame width = A + DBL + A = 52 + 18 + 52 = 122 mm. This represents the span from the outermost edge of one lens opening to the outermost edge of the other.
Q9The B measurement in the boxing system refers to:
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✓ Correct answer: The vertical height of the lens opening
The B measurement is the vertical height of the lens opening, measured in the boxing system from the top to the bottom of the lens shape. It is important for determining segment height in bifocal prescriptions.
Q10A frame's effective diameter (ED) is 58 mm and the patient's PD is 62 mm. The frame has a DBL of 16 mm and an A measurement of 52 mm. What is the minimum uncut blank size needed?
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✓ Correct answer: 64 mm
Minimum blank = ED + 2 × decentration. Decentration per eye = (A + DBL)/2 − PD/2 = (52+16)/2 − 62/2 = 34 − 31 = 3 mm inward. Minimum blank = 58 + 2(3) = 64 mm.
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