ABO NOCE MCQ 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 ABO NOCE MCQ flashcards as text
What is the index of refraction of crown glass?
Answer: 1.523
Standard crown glass has an index of refraction of approximately 1.523, which is the baseline for most optical calculations.
Which prism orientation would correct a right hyperphoria?
Answer: Base down before the right eye
Right hyperphoria means the right eye deviates upward, so base-down prism before the right eye redirects the image downward to compensate.
What is the primary purpose of the distance between lenses (DBL) measurement?
Answer: To determine the width of the bridge
DBL (distance between lenses) measures the width of the bridge, which determines how the frame fits across the nose.
A prescription of -4.00 DS is ordered in polycarbonate. What is the primary advantage of polycarbonate for this prescription?
Answer: Impact resistance
Polycarbonate's primary advantage is its exceptional impact resistance, making it the preferred safety material regardless of prescription power.
What does 'vertex distance' refer to?
Answer: The distance from the back surface of the lens to the cornea
Vertex distance is the measurement from the back surface (ocular side) of a spectacle lens to the anterior surface of the cornea.
Transposition of +1.50 -3.00 x 045 to minus cylinder form yields which result?
Answer: -1.50 +3.00 x 135
To transpose: new sphere = algebraic sum (+1.50 + (-3.00) = -1.50), new cylinder = opposite sign (+3.00), new axis = 90° away (045+90=135).
Which lens tint color is most appropriate for enhancing contrast on a snow-covered ski slope?
Answer: Yellow or amber
Yellow and amber tints enhance contrast in flat-light conditions by filtering blue light and improving depth perception on snow.