Trivia Flashcards
7 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Trivia flashcards as text
What is the primary function of an anti-reflective (AR) coating on eyeglass lenses?
Answer: To reduce surface reflections and improve light transmission
AR coatings reduce surface reflections through destructive interference, increasing light transmission and reducing glare for the wearer.
What does 'OD' stand for in an eyeglass prescription?
Answer: Oculus Dexter (right eye)
OD is the Latin abbreviation for 'Oculus Dexter,' meaning the right eye, used universally in ophthalmic prescriptions.
Which prism direction is used to treat an esophoria (tendency for eyes to turn inward)?
Answer: Base-out prism
Base-out prism is prescribed for esophoria because it shifts the image outward, reducing the inward convergence demand on the eyes.
What is the term for the smallest detail a lens system can distinguish, often expressed as cycles per degree?
Answer: Resolving power
Resolving power (or spatial resolution) describes the ability of an optical system to distinguish fine detail, commonly expressed in cycles per degree.
A frame with a DBL (distance between lenses) of 18 mm and lens size of 52 mm has what frame PD?
Answer: 70 mm
Frame PD = lens size + DBL = 52 + 18 = 70 mm; this represents the horizontal width across both lenses.
What type of lens has a gradual change in power from distance to near with no visible dividing line?
Answer: Progressive addition lens (PAL)
Progressive addition lenses (PALs) provide a seamless gradient from distance to intermediate to near power without a visible segment line.
What is the recommended minimum prescription power at which vertex distance compensation becomes clinically significant?
Answer: ±5.00 D
Vertex distance compensation is generally considered clinically significant at ±5.00 D or higher, where small distance changes meaningfully affect effective power.