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Dispensing II Test 2

Image Jump, VPI, & Slab Off

QuestionAnswer
What is the OC for a Curve Top bifocal AKA sovereign or fulvue? 4.5
What is the OC for a FT-22, FT-25, & FT-28? 5
What is the OC for a Round 24? 12
What is the OC for a Round 25? 12.5
What is the OC for an Ultex A? 19
What is the OC for a Panoptik bi-focal lens? 4.5
What is the OC for a Round 22 / Kryptok 22-flint / No Chrome 22- barium? 11
What is the OC for a Ribbon B? 4.5
What is the OC for a Ribbon R? 7
What is the OC for a Franklin/ Executive/ E - Line/ Full Seg? 0
What is the OC for a Thin Line 35, 40, & 45? 0
What is the OC for a FT-35? 4.5
What is the OC for a Compensated "R" Seg? 4-10
This uses base up prism in the most minus/least plus lens to balance the patient's near vision? Regular Slab Off
This is where compensated prism is molded to ceate base down prism at the reading leve. It is ordered on the most plus/least minus lens. Molded base down? Reverse Slab-Off
This type of slab off is molded base down? Reverse Slab-Off
This type of slab off is grinded base up? Regular Slab-Off
Sudden displacement of an image as the bi-focal line is crossed? It is due to the difference in prism power from distance portion of the lens to the near portion of the lens. Image Jump
This occurs in the brain and is caused by wearing glasses with different distance RX's (powers). Vertical Prism Imbalnce (VPI) @ the Reading Level
When does VPI need to be considered? When the patient is a 1st time bi-focal wearer & the differnce between the 2 eyes in the distance vertical meredian (power @ 90) is greater than 1.50 diopters.
How do you correct for VPI? 1) Determine the diff. in power between the 2 vertical meredians (power @ 90) Distant RX only 2) Determine the reading level. 3) Use Prentice's Rule (prism = Dd/10) D= diff. in power between the meredians @ 90. d= RL
What is the average Reading Level (RL) for segmented bifocals & short corridor progressives? 8mm
What is the average RL for progressive lenses? 10mm
Which type prism does Regular Slab Off use? Base Up Prism
Which type prism does Reverse Slab Off Use? Base Down Prism
Which lens do we put Regular slab off in? It is ground into the most minus/least plus lens!
Which lens do we put Reverse slab off? Ordered on the most plus/least minus lens.
In reverse slab off, where is the slab line & seg line? Both are on the front of the lens.
In regular slab off, where is the seg & slab line found on glass lenses? Both are on front.
In regular slab off, where is the seg line & slab line located on a plastic lens? Seg line on the front & slab line on the back.
This is done on glass lenses? This can be ground on the front b/c the seg doesn't protrude & the bifocal is fused. The slab line is on the front & the seg line is on the front. Front Surface Bicentric Grinding
Created by: Sarah Blackmon
 

 



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