Great video. We just moved our Optical program online until further notice due to the virus situation and it is so awesome to have an experienced Optician walk us through these optical topics. There is definitely a shortage of opticians on KZread. Thanks again!

Fantastic. Answered my question about add. I am thinking about getting reading glasses online and didn't know how to add the NV number to my sphere. Thank you.

@LaramyKOptical

3 жыл бұрын

You are welcome and don't be shy about tweaking that add power +/- 0.25 or even 0.50 to get the perfect distance.

Love it....

Hello my friend, I wish you a very merry CLASS & HAPPY NEW YEAR. I would be much appreciative if you prepare a video for lenses with anti-fog & anti-fog combined with AR. I am Canadian and I am not a fan of anti-fog solution. Thanks.

@LaramyKOptical

5 жыл бұрын

I actually have all the stuff sitting on the bench to do just that. Now I just need the time to pull it all together and do some testing. I have nothing against Canadians or anti-fog products! ;-) John

Hello Laramy, yes, I will use my calculator...thank you...

Great video, Laramy-K Optical. I have a question. My right sphere is +2.00, my left sphere is +1.00, and my Add is +1.50. Do I add the right or left sphere to the Add? Thanks.

@LaramyKOptical

5 жыл бұрын

Both. +3.50 and a +2.50. Gotta have them made...

What would the reading be for a OD -2.00 ADD +2.50 OS -2.50 ADD +2.50

I have a progressive lens prescription. But, I do not know what does it mean by 'converting' the progressive prescription to Single lens. I know that the smaller ring like place under the lens will be missing (correct?). Does that mean that the power at that lower part lens will be spread to entire glass areas? Why do they do this? When I add the NV [or ADD?] to SPH, the addition affects the entire area of the glass, right? Wouldn't create abruption for the DV part of the prescription? naïve

Hello my friend, What I mean that as a Canadian our country is colder and we feel the temperature gradient more than those who live in places where it is summer most of the time. That means have the need to use an anti-fog solution is not very practical. That is what I meant. What are the manufacturers who make lenses with anti-fog coating. Thanks for your creativity, and understanding.

@LaramyKOptical

5 жыл бұрын

We get the reverse here in South Carolina. 99 degrees, 90% humidity and then you walk into 74 degree AC. I know the reverse too - used to live in Maine. I'll cover manufacturers etc, in the video. John

hey. I Kieron Grant and Carlitos Aldana is a lab tech from Belize city and my co-worker and I have been working with progressive lenses for quite some time. the problem we are encountering with the lenses is that both lens, (right & left) seems to come as a Right! which makes it difficult when cutting the left lens! to our knowledge of observation the left lens decentration is way off. making the pd impossible to reach the right full way it should! we sometimes have to push the left lens a little over to the front to have it in line to where we need the pd to be, and because of that it makes an invalid cut because the feelers of the machine could not read the lens because of the slight adjustment to make it correct! 🇧🇿🇧🇿🇧🇿🇧🇿

@LaramyKOptical

5 жыл бұрын

Take some pictures. Take quite a few pictures. Be sure the markings are still on the lenses. Have what you think is R on the R and L on the L. Then email them to me through the OpticianWorks website. I need more to go on. John

What about the PD? I see Rxs with single PDs and some with PDs for left/right. When dealing with a multifocal for case 1- distance+reading, and case 2-distance+intermediate and going to reading eyeglasses or intermediate, what does one do with the PDs?

@LaramyKOptical

3 жыл бұрын

Sorry Ronald - This one fell through the cracks on me... PD can be taken eye-to-eye = 1 number. Or center of nose to center of eye = two numbers. Just a more accurate method which is important in high powers and progressives. In lower powers, single vision and lined bifocals close is good enough.

When you call it a multi focal prescription, is that the same as a bifocal where they have the little area at the bottom of the glasses with a different strength? My husband and I are bickering at each other over this. He says I do not need to add anything to the sphere value since they are bifocals. Maybe he is right. I hope to hear from you. Great video, btw.

@LaramyKOptical

4 жыл бұрын

If you have a "Rx" with an add power shown as a separate number and you want bi-focals then you are all set, just head to the optician or (please no) online. If you want a pair of single vision reading glasses (not a bi-focal) then you do need to add the add to the sphere. If those numbers are low like +1.50 and +1.00 or -1.00 then OK to go online for them (single vision). If they are higher then see a pro. Hope that helps? May marital bliss be upon you. John

What if the prescription is written in plus cylinder form? Should you still simply add the add power to the sphere power with the prescription written as is or do you need to transpose it to minus cylinder form?

@LaramyKOptical

Жыл бұрын

kzread.info/dash/bejne/pIqBuZeaZtSwZqw.html

I live in the state of Georgia. I wanted to know if it is illegal to take a pd measurement with out a licensed LDO on staff?

@LaramyKOptical

5 жыл бұрын

I guess you would need to check with your state board to be sure. It is usually stated along the lines of "dispensing or providing an individual with a complete pair of finished eyewear." Saying you can't take a PD would be like saying you can't measure someone's shoe size.

@bigjohnny1047

5 жыл бұрын

Laramy-K Optical I was recently fired because of it. Thank you so much for the reply.

@LaramyKOptical

5 жыл бұрын

@@bigjohnny1047 Hmmm. sounds like you need a lawyer not an optician?

I have a question. I just took an eye exam and my results were R: +1.25 -.25 x180 and L:+1.25, -.5 x172 with no adding. What would those be, converted into the snellen chart? Can you even do that with just your prescription?

@LaramyKOptical

3 жыл бұрын

There is no direct relationship between lens powers and the Snellen Chart. Mostly because we see with our brains not with our eyes. You are naturally farsighted and that middle 0.25/0.50 is negligible. Lucky You!

I have progressive lenses that have never been able to get used to. I really just want some reading glass. Still confused because my Add has two numbers. For example my Right is -.50 x -0.25 x 045 and my add is 1.50/1.75pal. Not sure which one to use to convert to just reading. thanks for your help

@LaramyKOptical

4 жыл бұрын

Really reading, smaller print, paperback book go with +1.75. Computer, larger print, arms length go with +1.50. Combine that with your -0.50 you'd pick a +1.00 or a +1.25 off the shelf at the drugstore and see how it goes. You can self select for a few dollars or trial and error standing there. That second number --0.25 is nothing. I don't know what your left is...??? If it is nothing still try the same. The +0.25 for a PAL or progressive is from the 1990's, no need for it anymore and in fact works in the opposite way. Self select at the store and once you are happy choose the power that works and then maybe have a "real" pair made up. John

@MikeJones-lq4nu

4 жыл бұрын

left is +0.50 x -0.75 x 110 add: 1.50/175pal

@MikeJones-lq4nu

4 жыл бұрын

@@LaramyKOptical PD for right is 34.5 & 33.5 for left.

@MikeJones-lq4nu

4 жыл бұрын

right is -.50 and left is +.50 so that is why I didn't think getting drugstore cheaters would work too well for me

@LaramyKOptical

4 жыл бұрын

@@MikeJones-lq4nu Rut-ro, yep that is correct. Always wear the weakest power you can get away. In those powers a 0.25 + or - isn't going matter all that much. You just might need to hold something an inch or so closer or further away. Any decent optician should be able to help guide you. If you simply can't decide without "seeing" then ask them to trial-frame the two different add powers and decide which one you like better. Again - I doubt you will see much of a difference. John

I just got glasses for the first time in my life. Bifocals!! Anywhoo...I need some readers and am confused. Will there be NO "Add" number when I fill out the prescription online? Will it be ZERO (once the calculations are done)? My prescription: OD (sphere 1.00) (Cylinder -1.50) (Axis 090) (Add 2.00) OS (sphere PL) (Cylinder -0.75) (Axis 090) (Add 2.00) Readers per your conversion and my sketchy math skills: OD (sphere 3.00) (cylinder -1.50) (axis 090) DO I INCLUDE THIS (Add 2.00)? OS (sphere 2.00) (cylinder -0.75) (axis 090) AGAIN do I include this (Add 2.00)? I hope my question makes sense. Thanks so much for this!! My glasses took three weeks and I need readers faster. I'm hoping to order them online. These bifocals are killing my neck when I'm working on my computer. Take care!

What if your a - 6 SpH ? Cylinder -1 ?axis 117

Hello! I’d like to confirm, because i am working in a eye company, selling rx and nonrx eyeglasses. Can u confirm this, if this is negative number when you convert them to SVR, what usage will the patients use? Single vision distance?

@LaramyKOptical

Жыл бұрын

There are 3 videos related to conversion to different use. Everything required is covered in those videos. John

I have prescription of R 0 -1.25x 105 add 0.75 L 0 -1.25x85 add 0.75. Would single vision readers help with looking through optics for hunting?

@LaramyKOptical

2 жыл бұрын

No. SV distance might. You are all astigmatism correction so you will struggle. Your Rx is basically identical to my own. When I was shooting I wore a good pair of distance glasses. 0.75 add? Never heard that one before...

What if I don't have any numbers other than sphere and ADD, but my number is negative? How do I know my reading magnification?

@LaramyKOptical

2 жыл бұрын

I'd say if you are an optician trainee you need to head over to OpticianWorks.com and grab a membership! If you are a consumer drop me an email through the website and I'll help you out. Include a pic of the RX. John

Don't you also have to reduce the PD to convert from a multi-focal script to sv reader?

@LaramyKOptical

6 жыл бұрын

Steven, Yes you would need to do that too. But, I don't consider it part of converting lens power from distance/add to near. That would be more of a dispensing technique along with frame choice, material choice etc. John

@LaramyKOptical

Жыл бұрын

@@redgeraniumwolf Convergence. The eyes rotate in and down as objects come within 20' of us. -2 for intermediate 4 for full near or 1 and 2 per eye.

Where do I get the degree from?

Voice audio is to strong but still thumbs up

what if your cylinder and axis are both blank (no numbers)?

@LaramyKOptical

5 жыл бұрын

Linda, Then just add that sphere power and the add power and bingo, that's it! Doesn't get much easier. John

@lindacarlson1483

5 жыл бұрын

@@LaramyKOpticalhanks.. got it :)

How to convert from a Multi-focal Prescription to Computer Reader which is about twice the distance from a book Reader?

@LaramyKOptical

5 жыл бұрын

Yeah, that's about right. Most people think of it as arm's length. John

Is there a way to convert from single vision to progressive?

@LaramyKOptical

5 жыл бұрын

No you would need a distance correction and a near correction or a "prescription" with a distance power and an add power too.

@administrativelyyour

5 жыл бұрын

@@LaramyKOptical Thank you! 😊

Would these allow me to see far and read?

@LaramyKOptical

3 жыл бұрын

No - this is for a pair of reading only glasses. For distance/near you use a lined bifocal or a progressive lens.

I mean " VERY MERRY X'MASS..

What about when someone has plus cyl

@LaramyKOptical

3 ай бұрын

All optical work is done with the powers written in minus cylinder. All modern optical lenses are minus cylinder design.

At 4:25 this could be +0.75 -0.75×90 written as +0.75×180 (Transposed)

@LaramyKOptical

6 жыл бұрын

Osaf, Yes it could, but --- well, no it would be 0.00 +0.75 X 180 but --- all optical formula work is done with the powers written in minus cylinder form since we grind in minus cylinder. John

@osafkhan4388

6 жыл бұрын

Laramy-K Optical Ok Why all cylindrical lenses grind in minus side.

@LaramyKOptical

6 жыл бұрын

Over time since man first started experimenting with optical lenses they figured out that back-side or minus cylinder grinding techniques and lens manufacturing worked better than plus cylinder techniques. I really can't remember all the details anymore! I know we held examples of plus cylinder designs in school but that was a 1,000 years ago now. John

@osafkhan4388

6 жыл бұрын

Laramy-K Optical Haaaaa😂 ok

@AbdulRehman-hf1hb

5 жыл бұрын

OSAF KHAN why not

Sir please if possible provide my reading number This is my number OD - SPH -0.50 CYL -0.75 AXIS 80 ADD 1.25 OS - SPH -0.50 CYL -0.50 AXIS 80 ADD 1.25

Are stupid questions allowed here? What is "a 160 with AR"? Not an optician here, obviously.

@LaramyKOptical

4 жыл бұрын

1.60 is a lens material. AR is a anti-reflective coating to reduce glare or allow more light to pass through the lens. Light = Sight. *1.60 is an index of refraction. John