Compound prism question - OptiBoard Discussion Forums
2013年5月2日 · for the prism angle A, relative to the horizontal 180-line. You will then need to determine the specific prism axis from 0 to 360 degrees by considering the actual quadrant on the lens that the prism base falls within (e.g., prism down and out for the right eye would fall into the third quadrant between 180 and 270 degrees). Best regards,
When does prism compound vs cancel? - OptiBoard Discussion …
2016年11月2日 · Can someone please help me with this. I've found different answers as to when prism compounds or cancels when it comes to base in and base out prism. According to the "Ultimate ABO Study Guide" by opticianworks, BI/BO - cancels and BI/BI & BO/BO - compound. However when I took the practice test on opticianworks
Reading Compound Prism - OptiBoard Discussion Forums
2008年10月8日 · Suppose I moved the prism dial 3D to my right, then read the prism as 3D at 45/225. Using the chart, that gives me about 2.1 Out and 2.1 Down. Add in the three and I get 5.1Out, 2.1Down. If I take those same numbers, 5.1Out and 2.1Down and use those numbers to convert back to the compound form, I get OD5.5D&O @25.
Ordering compound prism - OptiBoard Discussion Forums
2019年8月21日 · So I received my first prescription with a compound prism. It was prescribed as "2 PD Base Down & Out @ Axis 135 OS only" After finding the proper conversion method, I figured out that it was 2.00PD @ 315 = 1.41 BD 1.41 BO and then I try to order it.
How do I use a Fresnel stick-on prism?
2015年11月6日 · 2. If you have compound prism (both vertical and horizontal components ) Do not use two Fresnel's. (one direction in one eye, the other direction in the other eye) for the same reason listed in #1. 3. With compound prism, figure the resultant prism ( P² = H ² +V ² √) then it's orientation/axis ( Tan ‾ ¹ = V/H ) 4.
Calculating Prism in Compound Lenses - OptiBoard Discussion …
2015年8月6日 · I am learning about calculating prism in compound lenses from a study guide, and I have an example question that I conceptually do not understand. RX: -1.00 -2.00 x 30 PD ordered at 30mm but received at 33mm 1) 30 degrees from 180 2) 25% of cyl power in effect 3) 25% x -2.00= -0.50 4) -1.00 + -0.50= -1.50 5) (3 x 1.50)/10= 0
Compoumd Prism - OptiBoard Discussion Forums
2005年4月25日 · I'm looking for a compound prism charts to determin the axis when a prism is prescribed like 2up & 1 out. I have seen a chart like this many years ago in the old B&L job coach. If anyone has a digital copy or can fax a paper copy I would be in debt to them, John Z. fax 866-341-9022
Splitting Prism BASICS - OptiBoard Discussion Forums
2016年6月3日 · AMOUNT: Cut total prism amount exactly in half, to make each eye the same amount of prism. and BASE DIRECTION: a) If single eye prism was BI or BO, then make each eye this same BI or BO prism base direction b) If single eye prism was BU or BD, then make that eye the same BU or BD, but give to the fellow eye an opposite base direction.
Needing help with prisms - OptiBoard Discussion Forums
2008年8月6日 · The base out prism is different because out for the right eye and out for the left eye compound unlike the vertical prism, you'll also notice that this is the case with the axis, 90 is always up and 270 is always down, but depending on the eye the 0 and 180 can be n different directions so the base out prism would be split in half and both eyes ...
Fresnel Prisms and Getting all the "bubbles" smoothed out
2024年4月25日 · Mark Fresnel at prism poles with an indelible pens like a lens marker (towards outside of the intended used area). Important : NEVER put one on one lens up/down and on the other lens one in/out for compound prism needs. Use just one lens, on their non-dominant eye, and turn the Fresnel to compound the prism for both vertical and horizontal needs.