ABO practice Examination
Comprehensive Questions (Frequently
Tested) with Verified Answers Graded A+
Flat top bifocal - Answer: Thought of as a round segment with the top cut off. Optical center is
located closer to the transition line - producing less image jump
What are flat top bifocals also called? - Answer: straight top bifocals or D segments
22, 25, 28, 35, 40 - Answer: What diameters are flat top bifocals available in?
Executive bifocal - Answer: AKA franklin style. designed so the reading portion spans the entire
diameter of the lens. minimized image jump bc optical center of reading portion is located near
transition line
Ultex - Answer: offers a potentially large reading area, optical center of reading is positioned at
the bottom of the segment - causing excessive amounts of image jump
the blended - Answer: round segment ranging from 22-28 mm diameter. transition from the
carrier lens to segment has been smoothed making it difficult to see
What is an ED trifocal suited for? - Answer: well suited for the person needing a wide
intermediate are in combination w/ a large distance area and normal reading segment
what is one way to correct vertical imbalance in a multifocal? - Answer: slab off
conventional slab off - Answer: always ground base up on the lens with the most minus or least
plus power in 90 degree meridian
Comprehensive Questions (Frequently
Tested) with Verified Answers Graded A+
Flat top bifocal - Answer: Thought of as a round segment with the top cut off. Optical center is
located closer to the transition line - producing less image jump
What are flat top bifocals also called? - Answer: straight top bifocals or D segments
22, 25, 28, 35, 40 - Answer: What diameters are flat top bifocals available in?
Executive bifocal - Answer: AKA franklin style. designed so the reading portion spans the entire
diameter of the lens. minimized image jump bc optical center of reading portion is located near
transition line
Ultex - Answer: offers a potentially large reading area, optical center of reading is positioned at
the bottom of the segment - causing excessive amounts of image jump
the blended - Answer: round segment ranging from 22-28 mm diameter. transition from the
carrier lens to segment has been smoothed making it difficult to see
What is an ED trifocal suited for? - Answer: well suited for the person needing a wide
intermediate are in combination w/ a large distance area and normal reading segment
what is one way to correct vertical imbalance in a multifocal? - Answer: slab off
conventional slab off - Answer: always ground base up on the lens with the most minus or least
plus power in 90 degree meridian
