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I just wanted to say a big thank you for this video. I just started to study to become a dispensing optician and I suck at maths and understanding. You broke this topic down for me in such a fantastic way. I now know what Vergences are, why we use them and how to work them out. - I really appreciate you uploading this video, because I have been scratching my head for days.

Good info thank you

Fantastic stuff

Bad Audio but amazing explanation

Fantastic content

Fantastic content

Best explanation, thank you

Thanks for the explanation mam

I just started working as an ophthalmic assistant and this is the only explanation that makes sense to me! Thank you sooo much! 😭

best JCC explanation by far on YT, very clear step-by-step explanation

question : In your explanation -6.50 +5.00 X004. when you say 90* meridian is away from 004 are we subtracting or adding. this is where i get confused. I see that we are adding to get 90 +004 = 94. how to we know if we will add or subtract? from the meridian. i know it may seem simple but i am trying to know if there is a visual I can "cheat method " to know which way to go. or is due to they type of lens?

your Image drawing have helped me see, what i was not understanding. thank you.

how did you get vertex distance change 10 mm? thanks

you are lacking the prsentation skill and you cant make us undersyand step by step

Every time I listen to someone explaining the power cross I get more confused

je t aime thank you so much

Hi Ma’am Hope you’re fine I want to know how do we get Refractometry in this video

Very detailed video, got a lot from it

I’ve been given the task as an optician to learn some refracting and I understood it all except Jackson fitting cross and your video helped explain it so much better than most for me. Thanks to you I’m this much closer 👍🏽🙏🏽thank you. 😊

You should find something else to do

Great video ! Thank you

Well explained. Thank you

The best explanation of these parameters that I have ever seen! Thank you!

Thank you for helping me relearn lol

Can you include some exercises when the prescription has negative cylinder?

I have a bc of 8.5 and diameter of 14.5 and looking for a soft lens with higher power. Only option is 8.7 and 14 and I’m wondering if this is just not an option. I’m currently wearing a -12 in soft contacts and don’t desire a hard lens. I wear a -12 now and when driving I wear eyeglasses OVER THE CONTACTS with a -2 for sharpness and clarity. So I’m looking for a lens of about -13.5. Hence the issue with the bx and diameter options available.

Very informative.

Thank u 👏🏻

thankyou

Excellent video! the animation and content is great! 👍🏼 I like to think of the balancing and manipulation effect in terms of units as a way to keep track of the changes.

Thank you!! Very clear! Thank you for sharing your knowledge 🙏

so helpful, thank you so much!

Very helpful and easy explanation

Get the sphere, then Spin, spinners, straddle! 👀.

keep up the good work doc. i never understood toric lens and u described it beautifully. hats off

I needed this ABO questions ask about cross cyl. And what the powers are

great video!!