Trial Lens Parameters Choice - Soft Spherical CL Fitting (2/3).

#contactlens #optometry #smartoptometry #tutorial
After watching this video you will be able to know about:
1. What is Base Curve?
2. What is total diameter?
3. What is back vertex power?
4. Formula for identifying base curve.
5. Formula for identifying total diameter.
6. Formula for identifying back vertex power.
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[@Shiva-nr6mm]

Please give more examples with toric power

[@iMuayyad]

Thanks for sharing these information ..

[@optometry-with-samir]

Stay with us. We will continue this way. Share with your friends also 🙏🙏.
Thank you,
Team Smart Optometry.

[@user-rr3xm5lu2w]

Does This calculation work in Rgp lens. My doctor in college always ask questions from these and I don’t know how to calculate it. Just base curve he said take flat K as base curve. But the total diameter and back vertex power i don’t know how to calculate it , so these work for Rgp or not ?

[@optometry-with-samir]

Contact lens power calculation is same for soft and RGP lens.
Watch this video for details: czcams.com/video/H2WSsOK-3Nc/video.html

[@babitakumari6343]

Why we need to change the vertex distance from mm to meter?

[@optometry-with-samir]

In formula we need in vertex distance in meter form not in mm.
Thank you.

[@krithikalakshmi4587]

Sir ..please ans me sir..
Why we estimating BVP ??

[@optometry-with-samir]

We wear spectacle about 12-14mm away from anterior surface of cornea but Contact Lens is directly attached with cornea. To neutralize this distance, power get changed when we convert spectacle power to contact lens power.
Thank you,
This is Samir from Team Smart Optometry.

[@krithikalakshmi4587]

Thank you sir👍

[@tapiwa5682]

Can we have for hybrid and scleral contact lenses pliz

[@optometry-with-samir]

I will try to prepare a video on Hybrid and Scleral Contact Lens.
▪️Stay with us and share with your friends.
▪️Don't forget to download our App "Optometry Notes and MCQs ". It's available in Play Store.
Thank you,
Samir Sutradhar.

[@tanimabera3749]

What is optic zone diameter?

[@optometry-with-samir]

For soft contact lens, optic zone diameter ranges between 5-8mm depending upon the patient pupil size in dim light condition.

[@Shiva-nr6mm]

How to convert diapter to mm

[@optometry-with-samir]

Check this: czcams.com/video/zq5kKVw5OZ8/video.html

[@akinom-M]

Excuse me sir but 337.5 kya hota hai

[@optometry-with-samir]

Actual formula is:
(N1 - N2) x 1000/ K reading.
Here,
N1 = Refractive index of keratomerter that is 1.3375
N2= Refractive index of air that is 1
So finally it comes,
(1.3375-1) x 1000 or 337.5

[@akinom-M]

@@optometry-with-samir tQ 😊

[@akinom-M]

@@optometry-with-samir aap RGP CL fitting ki bhi bna do sir

[@optometry-with-samir]

Working on it..
Thank you

[@akinom-M]

@@optometry-with-samir BOZR me SCL ka ky rol hai