Optician Training: How To Use The Optical Cross
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- Опубликовано: 7 июл 2024
- The Optical Cross: Learn how and why we draw the principle powers and meridians of a lens on paper.
Learn More: opticianworks.laramyk.com/
The Optical Cross:
The combination of a lens front base curve and its back curve (or curves) results in the total power of the lens. This power can be drawn on paper and it can include where on the lens the power is located. When we draw the total power(s) and position, or axis, on paper we call it drawing an optical cross. For optician training or ABO NOCE study, this lesson includes a bench session where we closely examine a sphero-cylinder lens marked with its two principle meridians. We then go on to draw an optical cross directly from an actual lens. We place powers on an optical cross and we learn to remove a written prescription from an optical cross.
Connect with us:
/ opticianworks
This video lesson is sponsored by Laramy-K Optical
Laramy-K Optical is a digital uncut and coating lab unlike any other. The only exclusively uncut lab in the country; we provide our customers with independent, high-end alternatives to corporate brands. Through craftsmanship, technology, and independent, innovative vendors like Younger, IOT, A&R, and Quantum Innovations we’ve developed the Integrity portfolio of freeform lenses and coatings. Made in the USA, the Integrity brand is not a generic house-brand, but is the absolute best we provide, designed to give the wearer that “wow!” experience.
In addition to the digital line, we still offer conventional surfacing, including glass. Maintaining traditional equipment gives our customers vastly more flexibility in their dispensing, particularly when it comes to more difficult prescriptions.
Learn More: www.laramyk.com
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I am a retired optician and love re-learning optical theory. Thanks for helping.
Thank you for this slow explanation, braking it down like this is making so much sense to me. It really does make a difference to actually know what your doing rather than just flying through it just for the test. Thank you for highlighting that.
Thank you thank you thank you! I can't thank you enough for not charging an exorbitant amount of money for you knowledge. For being so willing to freely share what you know. And you made it so easy. My company I work for sent me study materials. I was reading through them, thinking there was no way I was going to pass. I'm a smart woman, but I was completely baffled. Then I found your web page! And the heavens opened and the light shone down! I got this. Thank you.
God bless you sir and also your team. You have really saved me. I am studying an optometry course and everything is such a blur sometimes, our lecturer even says we should be able to do the transpositions without a calculator but i''m really not that good in math or algebra. Thanks for the confidence, really. Understanding this brought tears to my eyes. Thanks a lot.
This makes more sense to me now than just reading it. Thank you so much for the detailed explanation. ♥️
Thank you.. I’ve been an optician for 5 years and gaining more of an understanding is key to me. You are God sent😊😊
Thank you so much for this! I just started my exam prep course today, and this is on my first module. You explained it in a way that I said “I GET IT!” out loud. Bless you and your entire team!
I really do appreciate all your videos, truly grateful for your given effort and time, John. It will never go to waste, a knowledge that helps me to better understanding of how it all works.
Love this channel, can't believe i only found it now. You're like the John Malkovich of Opticians!
LOL! Thanks so much, Adriano.
You are a true blessing!! I have learned so much from your videos. You are a AWESOME teacher!! To you and your team, THANK YOU!!!
You are welcome. John
I think ive got a knack for understanding. This is awsome. My Saturday lesson. 😀
I'm excited to watch your videos, I'm training to be an Optician, and your videos are a wonderful resource for me!
Thanks for watching, Victoria!
Thank you, thank you, thank you! This has really helped me. Writing intermediate ophthalmology exams in a few weeks and a couple of people have tried to explain this to me in the past and it's never taken, but this was very clear and I needed the baby steps approach! Thank you for taking the time to make these videos!
Thanks for the feedback, Daisy! We're thrilled you are benefiting from the information!
It's always a pleasure to listen to you. Keep it going mate.
Great refresher thanks for simplifying and making this training easier to retain.
Thanks for your feedback, William.
Studying to become a dispenser optician and working as an optical assistant at the moment. Your videos been more than helpful. This channel is a true treasure❤️ Thank you so much💖
Thou art most welcome. Check out the full OpticianWorks program. If you see yourself as an optician for the next 10 to 20 years your life you will be much happier. John
Great explanations and examples, thank you!
I have just started a job selling eyewear and need to understand prescriptions and lens choice. I am so glad I found this channel. It will help me immensely.
The videos are just a part of the complete program. OpticianWorks.com
Thank you ! I'm Russian and English is my second language , but it so easy to understand! Subscribed!
These are awesome! I so appreciate your teaching, you do a fantastic job!! I am learning so much, Thank you.
Thanks
Sir, you are amazing- I am following all your videos for my optical license exam in canada
Thank you so much. You’re the best on the internet for this type of material. I am studying for my ABO, but I WANT to know exactly what it is I’m doing and why I’m doing it so I CAN be the best I can be! So thank you, truly, for taking such care with these videos. You’re a lifesaver!!!!
You are very welcome.
Excellent video! Great addition to the study guide, which I did not understand at all on the topic.
Love the theory that goes along with everything because that really reinforces ideas and explains why we are doing the things we do. That's very useful for the analytical brain like mine, so thanks!
Elizabeth - You may want to check out the complete program at www.opticianworks.com.
Your highness u r more than a teacher...Thank u
Khizre, No, just a teacher who actually enjoys teaching this specific material! Thanks so much for the praise. John
Thanks so much! It all makes perfect sense now!! ❤️
I finally get how this works.. I can do the problems. But I didn't get the concept until now. The light bulb went on in my head. Thanks!
This video was so helpful i recently just got a job as an optician and I’m still in the learning process
It is the most watched video we have! Getting close to 20,000 views now. Reckon I must have done something right! Thanks John
@@LaramyKOptical Im retired and I find your videos facinating and educational. 😀 this old dog is still learning. 😁
What is wrong with you? This is elementary school level stuff
Thank you so much for amazing video!
Thank you very helpful.
Your videos are brilliant. I am about to start the student dispensing optician course and find these thoroughly helpful. Thank you so much :)
Thanks for the comment, Kat!
this guy is brilliant! legit makes the complex so simple
I assume you mean the brilliant shine off my bald head! ;-) John
Thank you, this was very helpful. Greetings from Bolivia!
Love your channel man! Literally so helpful in my studies
Thanks - Amazing this video is nearing 26,000 views now. It's almost a shame it is so rough around the edges. But it must work! John
simple and amazing clear 👌
Thanks the lord! So much easier to understand after thus video.
Very nicely and simply explained Sir. I'm an Ophthalmology resident and was so confused about the relationship between a cross and a prescription. Everything is clear now. I'm indebted to you Sir. Please keep posting your wonderful lectures. Best wishes
Thanks for watching, Hamid! So glad we could help.
You are a excellent teacher.
Awesome video, thanks for posting. I am studying for my COT exam, you have made the optical cross make sense!
So glad to hear it Nikki! Thanks.
Nikki Adkins
Hi Nikki ,
I'm studying for the COT exam as well , I'm struggling 🙁
Have you taken the test yet? Do you have any advice for me ? Thanks in advance
thank you very much for every single video , I'm looking forward for more🎉💕
Thanks for your comment, Yasa. We have many more in the works!
Easy to understand and solve !! Thanks for the video. Want to see more
We're working on it! ;)
Thank u your teaching is great and good i did Degree in Ophthalmic dispensing from Bradford college UK ...
We had excellent teachers but i really missed these lessons from you so after degree still learning watching your videos ...if you plz continue leave execise questions for us to complete nex week you give us answers we can check our progress .thanks a lot.stay blessed
You are welcome. We do have plenty of practice questions on the OpticianWorks website but I like your "leave us with a problem" idea. John
Very helpful. Thank you for doing these types of videos
Thanks for watching!
Thanks for such helpful video.
Wow just wow.... Simply amazing.... Please do more videos for a beginning clinical optics student
Thanks Waleed! We'll do what we can.
Thank you very much
Love it! Thank you 🙏 I am returning back to optician work, after a long time doing other job. I need help to freshen up.
Try OpticianWorks.com!
THANK YOU SO MUCH ,I WANT FEEL SO FAR BEHIND IN SCHOOL,THANK YOU GOD BLESS YOU.
Thank you soo much
It's very helpful for me.😊
Thank you very much, Laramy!!!
This was sooo helpful thank you so much!!
You are sooo welcome! John
Thank you so much:) these videos finally cracked into my brain and I actually like math now:)
Thank you very much 🙏🙏
I really appreciate your effort
Wonderful. Thank you.
As a opticien/bussiness owner in the Netherlands. I have a franchisestore from the Eye Wish brand. Sinds june 2019 we have a buy one get one concept. The cheapest pare of glasses are free. I sell a lot of glasses this way. Most of my customers first start looking for there frames, then they take there measurments.
god bless you from the bottom of my heart
;-)
Wow.Thank you very much
Thank you! Very well explained
Thank you for watching, Lillia!
LOVE LOVE LOVE YOU! thank you soo much.
This has helped me so much!!! I am learning. I am understanding. I am enjoying your videos!!!!
Excellent! John
I'm taking my abo test in a few days and these videos are helping me review 👍
Glad to hear it, Christina! Thanks for watching.
Christina Krumm How did it go
Christina Krumm any advice? I want to do mine too soon :)
thanks for the useful video
Thanks for watching!
Thank you so much, I have been trying to learn and understand this topic of the RET. I really appreciate it. Jazak Allah. Looking forward to being the best optometrist or further as I am looking to study eye surgery as well.
You are welcome. It's painful for me to watch that one now - we have come a long way since then but - heck - the lesson is still a good one. 118,000 views! imagine that, imagine that...
@@LaramyKOptical Ayyyy alhumduAlla. You are the best Lecturer ever. God bless.
Hello Laramy, I'm here again, to hear your interesting theme...thank you...
Hello!
You're the best 👌
amazing teaching technique
Thank you, Harun!
Okay so I am going to start an optical program soon and this is amazing that you all made this content available to us, so thank you for that I appreciate you all for your time and efforts, that’s number one and well number two thing I have to comment is kinda weird but I didn’t notice anyone else making a comment on it, so I noticed and really started hearing some whispering noises around 13:42 and it lasts until about 15:00 or so. I don’t know if that was a mistake or just a personal thinking out loud but it made me spooked 😱 it’s freaky sounding. Somebody/ anybody tell me if they heard the same thing or even know what it is or what they’re saying cause I’m completely confused and slightly uncomfortable 😣, but that aside these are awesome and a huge help , I thank you again ( creepy voice dude and all ) lol 😂
The videos are just a small part of the entire program, www.OpticianWorks.com!
Thanks a lot!😊
You are welcome.
Thank you! Thank you! Thank you!
MY FRIST LESSON IS AWESOME',THANK YOU
So helpful
Helllo! I'm studying AGAIN for my ABO and I want to say thank you for this tremendously but I'm confused with how you got 1.75 in the cyl and the direction you got the cyl for the +3.00 you said it will be a minus 1.75 but the last cross in the same direction it was a + then the cyl number!
it could also be used in contact. Great!!
Ken, Maybe? I'm thinking that contacts may work in the reverse? I may be wrong but I think they might work from the ocular view? I'd check first... But the concept either way is crazy important for working with contact lenses.
The was awesome! We truly appreciate what you do. You kinda remind me of John Malkovich LOL :)) GREAT WORK!!!
wow this video is awesome ,thanks!!!!!!
You're welcome!
IM interested how to calculate a double vision astigmatism how to get the Add
AM glad to subscribe to your channel
Calculate the combined effect of the following
sphero-cylinders
+3.00/-2.00 x 45 and -4.00/+1.00 x 110
This is so interesting - even for someone NOT in your trade. I wear glasses, and always wanted to know and understand how eyeglasses are made. Especially in a zombie apocalypse - I can make my own glasses! Just have to find a lab, clear the zombies, and open up shop!
Thanks
Thanks for watching.
Thnx sir 💯🙏🏼
Hello! I found this video helpful because I now know how derive a prescription from the optical cross as well as how to add the power of a lens onto the optical cross. The math portion of it was very easy for me to understand. What was not easy to understand, and what I still can't wrap my head around, is all of the terms! I don't know what a principal power is nor do I know what a meridian is. I can't find the definition of these terms in relation to optics, and I was hoping this video would help with that. I know how to "solve" the problems, but I don't know much more than that.
I'd head over to www.OpticianWorks.com. I'm not sure where the terminology comes from exactly but I think basic geometry? It is a case of assuming you would already know some things before ever needing to watch a video on the optical cross. Not something you Goggle for fun...
I am too glad to subscribe your channel ,✌👌
Welcome!
God bless you
I don't get that very often!
John
Very very nice sir
Can you explain more on how the cylinder signs are figured out I’m a little confused
Please do a video on ANSI standards. My question is I know if the requested PD and the actual PD are off horizontally you get to play with is .66 prism diopters. My question is is it a flat out .66 if you're off it doesn't pass ANSI standards? Or it's .66 of whatever the prescription if so then if I have
10 OU, and through Apprentice law I discovered thatI have 6.6 base out does that mean that it does not pass ANSI standard?
D Sep All the videos on prism are ANSI Standard based. I do cover that in detail with some practice exercises on the website. Short answer is, "NO" wrong is wrong. You will not go through working Prentice's Formula to figure out of it COULD pass. WRONG is WRONG send it back to the lab. And sadly I can't actually use ANSI since they are proprietary and copyrighted/trademarked. Which to me is like saying that you can copyright/trademark the number 2, but heck that is the way it is. John
Good
Hi John. I am really enjoying watching your videos, but I need more worka. So I am trying to register for the courses you have, there is voucher code, that I have no idea how to get that and what is that for? Could you please explain or at least give the code??
Hi Parastou. Here is where you sign up for the courses: opticianworks.com/join-today/
How do you know which eye is which?
i hope this is how the prof in colleges teach since everything is done virtually, rather than just reading the ppt. :(
Please provide a vdo with axis chart how to marking axis on lens
I'm not sure exactly what you mean? There is no such thing as an axis chart. The axis is marked on the lens while using the lensmeter. Take a look at the video on Calculating Resultant Prism - are you talking about that chart or as it is called the optical protractor? John
Even Costco needs training on how to sell / fit glasses.
Hello, where would you say the power was? Could you say the power lies vertical or horizontal? I’ve been asked to say where the power lies and it’s confusing me as I do it how you’ve shown. Thank for any feedback
Could be anywhere. Could be the same everywhere. Principle meridians any of 180 possible locations. If in doubt always go back to the lens - look, touch, feel those curves. The high point and low point is power you know. Everything in-between you can figure out. As to where it is - until it is mounted in a lens it could be anywhere. After that it is about axis. Sounds like you, and the person asking you that question, could use OpticianWorks.com! John
Or from Dr. Seuss: It could be here It could be there It could be left It could be right It will be where it needs to be for the best site The concept on the brain it taxes but it all comes down to axis Think of that lens as a wheel and roll it around until it makes the deal
Is the cylinder power only added to the top half of the lens?
Er, um, no. But - there is a drawing or cross model where cylinder is shown as being applied over or added "on top of" the spherical portion. I never quite got my arms around that one and it has caused some problems for me over the years. If you mean why is the cross shown as 0-180 or 180-0 that is just how it is drawn with the assumption that what is happening on top is also happening 180 degrees away. The only exception is the prism chart based on full 360 degree notation.
Dear sir please make a video related to meter angle of eye how it will be calculate ?
Sorry - opticians in the US don't do refraction so we don't cover it. John
What is difference between transposition and optics cross?
What if we have only Cylinder value?
Does this video mean that a uncut lens of -7.00 sph and a uncut lens of -7.00/+3.00/90° will have the same thickness at atleast once point along the sides.
Yes! But I would encourage you to see it and feel it with an actual lens rather than trying to visualize it off the optical cross. (Although that is quite impressive too) John
This should be really interesting to check out. Thanks for the quick response.
I'm having trouble with the volume in this video. I can hear the first couple of mites then it goes silent.
Hi Michelle, Sorry you are having difficulty. The sound is there. You might try clearing your browser cache or using a different browser altogether.
Literally relying on this material because the info I was given at work isn’t enough 😅
So glad we could be helpful, Lauren. Thanks for watching!