How to calculate Base Curve of contact Lens (Soft CL)

--------------------------------------------------------------------------------------------------------------------
Our Facebook Page: / smartoptometryblog
Our Facebook Group: / smartoptometry
Our Instagram Page: / smart_opto
Our Blog: www.smartopto.blogspot.com
OUR OTHERS TUTORIALS:
1. Learn By MCQ -
• MCQ - Refractive Error...
2. Binocular Vision:
• Binocular Single Vision
3. Clinical refraction:
• Binocular Subjective r...
4. Instrumentation:
• Optical Coherence Tomo...
5. Ocular Disease:
• Dry Eye - Introduction...
6. Contact Lens:
• Contact Lens Materials...
7. Binocular Subjective Refraction:
• Binocular Subjective r...
8. Biometry:
• Biometry-3 | Measureme...
9. Optical Coherence Tomography:
• Optical Coherence Tomo...
10. Dry Eye:
• Dry Eye - Introduction...
11. Myopia:
• Myopia - Introduction ...

[@mafia1270]

As always..,Well explained doc..thank you

[@optometry-with-samir]

It really motivates me.
Thank you,
Samir Sutradhar

[@samuelagwu3323]

Simple and yet to the point

[@optometry-with-samir]

Stay with us and share with your friends.
Thank you,
Team Smart Optometry.

[@Santhosh-zq7gl]

Clearly explained... Thank you sir

[@optometry-with-samir]

Stay with us and share with your friends.
Thank you,
Samir Sutradhar

[@hridoymojumder7016]

Thank you make it easy for me

[@optometry-with-samir]

✓Stay with us and share with your friends.
✓Don't forget to try our App "Optometry Notes and MCQs"
It's available for free in Play Store.
Thank you,
Team Smart Optometry.

[@rajeshtripura725]

Well explained! Thanks!
Why we have to choose 1 mm flatter BC in SCL ?

[@optometry-with-samir]

✓To cover something you need bigger than the thing.
✓For proper movement of the lens.
✓For better movement of tear film.

[@SuperMilkis]

Thank you 🙏

[@optometry-with-samir]

▪️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.

[@samdcuza7343]

Nice

[@optometry-with-samir]

Stay with us and share with your friends.
Thank you,
Team Smart Optometry.

[@agnesquay9812]

Hi, we should see the K value from simK, posterior axial curvature or anterior axial curvature zones?

[@optometry-with-samir]

K reading of Anterior curvature....
Because we are going to fit contact lens on anterior corner not on posterior cornea.

[@thepessionabdulla8666]

Sir A scan pr video bnao

[@optometry-with-samir]

Here is Playlist of Biometry: ruclips.net/p/PLslkRTVi8_xeRM6GnivjSBwATyCU5r1-K

[@hifzazaidi1951]

Sir why we add 1 to the avrage k

[@optometry-with-samir]

To sit on cornea properly we have to choose CL having more curvature then the cornea. If we use same curvature of cornea CL won't fit on cornea. Initially we start with 0.6 - 1 mm flatter base curve but final outcome may be less or more than 1mm...

[@hifzazaidi1951]

@@optometry-with-samir thq so much sir for answ my ques. I searched this ques everywhere but could not find the answ.

[@lplakshmipriya8679]

Sir finally why we chose 1 mm?

[@optometry-with-samir]

It's not final. For trial lens we start with 1mm flatter base curve. After assessment of fitting it may change. But most of the time 1 mm flatter works well.
Thank you,
Samir Sutradhar.

[@909sim]

Sir thank. is this RGP or softcontact-lens?

[@optometry-with-samir]

Check the title. It's for Soft CL.
Thank you,
Samir Sutradhar

[@d.perera7875]

Why 337.5?

[@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