ABO EXAM REVIEW 2023

What type of visual error is indicated by this Rx? Rx +2.00 -1.00 x 090 a. simple hyperopia b. compound hyperopic astigmatism c. compound myopic astigmatism d. mixed astigmatism - ANSWER-b. compound hyperopic astigmatism Increasing the diameter of a minus power lens always increases its: a. vertex power b. center thickness c. weight d. refractive index - ANSWER-c. weight The optical center of a round segment is located: a. at the very top of the segment b. in the geometric center of the segment c. 5mm from the top of the segment d. at the very top of the segment - ANSWER-b. in the geometric center of the segment Normal slab-off (Bicentric grind) is ground on the lens whose vertical meridian has the: a. strongest curves b. most plus power c. least plus power d. least minus power - ANSWER-c. least plus power A concave mirror: a. can focus on parallel incident rays to form a real image b. can focus parallel incident rays to form a virtual image c. always produces inverted images of real objects d. produces virtual images smaller than real life objects - ANSWER-a. can focus on parallel incident rays to form a real image White light is broken into its component colors when it is: a. diffracted b. frefracted c. reflected d. diffracted or refracted - ANSWER-d. diffracted or refracted To the viewer; the image seen in a plane mirror appears to be: a. inverted b. one-half as large as the object c. twice as large as the object d. as far behind the mirror as the object appears in front it - ANSWER-d. as far behind the mirror as the object appears in front it