A technician wishes to produce the lens +2.00DS/+2.00DC x90 in toric form, in CR39 (n=1.498) with a -5.00 base curve. After finishing the toroidal surface with the CR39 tool it is discovered that, in error, they have used a plastics material of refractive index 1.56. Which CR39 tool must now be used to work the front surface?
8 answers
Ok i will try to look it up on the internet and see if i can find the answer.
Oh, bless ya. I have tried doing the question but don't know what to do. I tried transposing the prescrition first to +4.00DS/-2.00DC x 180 then not sure what to do
I did it your way and got -360. Did you get that? I was just wondering. I have figured it out yet.
Nope, how did u get -360? I'm stuck not sure what to do next
Yeah..............Now I'm confused. :(
Never mind, don't think anyone has the answer to this!lol Thanks for trying though
Your welcome. Sorry i couldn't help you.
But this is a good website. MS. Sue is good a English so is writeatecher. Steve is good at math.
But this is a good website. MS. Sue is good a English so is writeatecher. Steve is good at math.
Great, thank you :)
1 answer