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The formula's to use would be both Martin's formula and Thompson's formula as far as I can tell, below is a link to a discussion on this topic....

Good to know, thank you!

Sound interesting, I'm game!!

"personally deleted due to incorrect operation applied do to ignorance"

Blu-Tech, second pair, for computer and digital devices.

Effective Power = power/(1+(change in vertex distance x power)).
* the vertex distance is in meters and is + if moving closer to the eye and - if moving away (so in your case +)
I am not aware of a...

Totally agree, a repair and an adjustment are two completely different items! And a "lawn mower mechanic shop" and "ECP" are on such different spectrum's that I will leave that alone! But I will add,...

Where did our "customer service" go? I'm not sure how many customers I've gained by actually doing my job. It's interesting to see where our industry is going, the main reason I've encountered...

Thank you, glad to be be here Wes.

Pretty tasty bone I might add?!!

Eating Crow I am!!!!! First please let me say thank you for your patience!! I had my light bulb moment after receiving said job and noticed I was wrong. So I was able to continue down the train of...

Now were talking about a whole other ball game, taking the question as it is none of the answer's seem correct as it can be done so D is not right but 54 will induce too much prism to be right as...

I am enjoying it as well, as I do not want to be "right" but to know "right"?! I understand completely the idea of two separate lenses and the image being bent/displaced by the add of the lens in the...

Ok that makes sense, I will have to play with that on Monday, so for arguments sake I will grab a -2.00, plano, +2.00, and for kicks and giggles a +4.00 and use these for the distance Rx. I will also...

I guess the only question I would have is a Ft-35 add power super imposed as stated over the carrier or is it one lens? if one lens then personally I would think the image path only encounters two...

I am by no means trying to prove somebody that is obviously ten times more knowledgeable than I am wrong. But I will add if we continue down a path that our predecessors had it right and we do not...

I am only talking about problem #15 of the review test here? I had issue with "C" being the correct answer and wanted some clarification as I did not agree with it? I cut it and did not get what "C"...

Apples and orange trees continue to produce apples and oranges? If I get a grape fruit from one of the trees I would have to rename the tree?

How difficult can it get when your only considering the add?

But I thought the "little add" has no dependance on the "distance" Rx? The thread has stated that regardless of the distance you only calculate the power of the add for decentration?

I think the issue is we are not talking about two separate lenses in reality? Of course if you take say a 1 base in prism in front of contacts the image will enter the first lens and exit then enter...

I will recheck it tomorrow in the lab, have you done this in actual glasses or just in math? A Dr. I used to work for would request base in prism in the near about 2 times a week on our older...

Just for the record my last name is King, LOL. Wes, I completely understand where your coming from, my problem is the theory and the actual results in lab are not matching. I will run the test with a...

Ok, so I ran a pair of glasses running the scenario from the test and get 4 base in OU, 2 diopters of prism per eye? The only way the scenario would work in real life application from what I can see...

Not sure if I agree with C being the right answer? Just trying to get some clarification as I am taking the advanced test next month. My calculation would be more of a near PD of 57.5? Correct me...