ABO CERTIFICATION TEST BANK
UPDATED COMPLETE QUESTIONS WITH
ACCURATE ANSWERS
●● Which structure of the eye provides most of its refractive power?
Answer: The cornea.
●● What type of lens corrects myopia?
Answer: Minus (concave) lens.
●● What type of lens corrects hyperopia?
Answer: Plus (convex) lens.
●● What refractive error is caused by unequal corneal curvature?
Answer: Astigmatism.
●● Which refractive condition occurs due to loss of accommodation?
Answer: Presbyopia.
●● What unit is used to measure lens power?
Answer: Diopter.
,●● What does PD stand for?
Answer: Pupillary distance.
●● Why is PD important in eyewear dispensing?
Answer: To align optical centers with the pupils.
●● What happens if PD is incorrect?
Answer: Induced prism and visual discomfort.
●● What lens corrects astigmatism?
Answer: Cylindrical lens.
●● What part of a prescription indicates lens power?
Answer: Sphere.
●● What does "CYL" on a prescription represent?
Answer: Amount of astigmatism correction.
●● What does the axis value describe?
Answer: Orientation of astigmatism correction.
,●● What is the axis range on a prescription?
Answer: 1 to 180 degrees.
●● What does "ADD" mean on a prescription?
Answer: Additional near power for presbyopia.
●● What lens type has visible segment lines?
Answer: Bifocal or trifocal.
●● What lens provides a smooth transition from distance to near?
Answer: Progressive lens.
●● What is the main benefit of progressive lenses?
Answer: No visible lines.
●● What is segment height used for?
Answer: Proper placement of near vision zones.
●● What is vertex distance?
Answer: Distance from lens back surface to cornea.
●● Why is vertex distance important in high prescriptions?
, Answer: It affects effective lens power.
●● What is pantoscopic tilt?
Answer: Downward tilt of the frame front.
●● Why is pantoscopic tilt important?
Answer: Improves visual alignment and comfort.
●● What is frame wrap?
Answer: Horizontal curvature of the frame front.
●● What lens material is most impact-resistant?
Answer: Polycarbonate.
●● Which lens material is lightest?
Answer: Polycarbonate.
●● Which lens material offers best optical clarity?
Answer: Glass.
●● What is CR-39?
Answer: Standard plastic lens material.
UPDATED COMPLETE QUESTIONS WITH
ACCURATE ANSWERS
●● Which structure of the eye provides most of its refractive power?
Answer: The cornea.
●● What type of lens corrects myopia?
Answer: Minus (concave) lens.
●● What type of lens corrects hyperopia?
Answer: Plus (convex) lens.
●● What refractive error is caused by unequal corneal curvature?
Answer: Astigmatism.
●● Which refractive condition occurs due to loss of accommodation?
Answer: Presbyopia.
●● What unit is used to measure lens power?
Answer: Diopter.
,●● What does PD stand for?
Answer: Pupillary distance.
●● Why is PD important in eyewear dispensing?
Answer: To align optical centers with the pupils.
●● What happens if PD is incorrect?
Answer: Induced prism and visual discomfort.
●● What lens corrects astigmatism?
Answer: Cylindrical lens.
●● What part of a prescription indicates lens power?
Answer: Sphere.
●● What does "CYL" on a prescription represent?
Answer: Amount of astigmatism correction.
●● What does the axis value describe?
Answer: Orientation of astigmatism correction.
,●● What is the axis range on a prescription?
Answer: 1 to 180 degrees.
●● What does "ADD" mean on a prescription?
Answer: Additional near power for presbyopia.
●● What lens type has visible segment lines?
Answer: Bifocal or trifocal.
●● What lens provides a smooth transition from distance to near?
Answer: Progressive lens.
●● What is the main benefit of progressive lenses?
Answer: No visible lines.
●● What is segment height used for?
Answer: Proper placement of near vision zones.
●● What is vertex distance?
Answer: Distance from lens back surface to cornea.
●● Why is vertex distance important in high prescriptions?
, Answer: It affects effective lens power.
●● What is pantoscopic tilt?
Answer: Downward tilt of the frame front.
●● Why is pantoscopic tilt important?
Answer: Improves visual alignment and comfort.
●● What is frame wrap?
Answer: Horizontal curvature of the frame front.
●● What lens material is most impact-resistant?
Answer: Polycarbonate.
●● Which lens material is lightest?
Answer: Polycarbonate.
●● Which lens material offers best optical clarity?
Answer: Glass.
●● What is CR-39?
Answer: Standard plastic lens material.
