ABO Practice Test(Questions and Answers 100% correct)

When discussing thick lenses, the factors which are considered in computing the lens power are: a. front curve, thickness and index b. back curve, thickness and index c. front curve, back curve and thickness d. front curve, back curve, thickness and index - Correct Answer d. front curve, back curve, thickness and index Toric transposition shows: a. lens thickness b. power in principal meridians c. the power of the ADD d. the lens diameter - Correct Answer b. power in principal meridians Increasing the diameter of a minus power lens always increases its: a. vertex power b. center thickness c. weight d. refractive index - Correct 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. 5 mm from the top of the segment d. at the very bottom of the segment - Correct Answer b. in the geometric center of the segment The base curve of any multifocal lens is found on the surface containing the: a. cross curve b. cylinder surface c. segment d. ocular curve - Correct Answer c. 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 - Correct Answer c. least plus power