Contact Lens Power Calculation

Contact Lens Power Calculation - Toric & Spherical

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Жыл бұрын

#optometry #contactlenses
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Пікірлер: 47

@mahamansari4299 6 ай бұрын

My right eye spherical number 5.50 cylinder power 1.50 and left eye spherical number 4.50 and cylinder numbers 1.00 what contact lens do i get?

@anishaa1136 6 ай бұрын

Nice video thnxs for sharing

@optometry-with-samir 6 ай бұрын

Stay with us and share with your friends. Don't forget to download our app "Optometry Notes & MCQs". It's available in Google Play Store. Thank You, Samir Sutradhar.

@mrjusti97 4 ай бұрын

Thanks for the video! I have a few questions: 1. In the formula you are using a vertex distance, but a contact lens has an internal surface and an external surface, so I think that there are two vertex distances. However, the distance between the surfaces is too small. With this in mind, are you considering the contact lens as an unique surface? 2. Respect to the cylinder calculation, it is indistinct if the toric surface is internal or external?

@optometry-with-samir 4 ай бұрын

Even though normal vertex distance is 12 mm (much greater than CL thickness), it's impact is significant when spectacles power is 4D or more. So CL thickness is not a significant factor. For Toric also calculation is same but we choose Front, back or Bi-toric based on the types of Astigmatism patients have. Front toric for internal Astigmatism, Back toric for Corneal Astigmatism, Bi-toric for high degree Austin

@janhvi8679 12 күн бұрын

@@optometry-with-samir hi, based on this i have a question. if the px has a toric prescription, we would use the formula, but how do we know whether they have internal, corneal or high degree astigmatism?

@optometry-with-samir 12 күн бұрын

@@janhvi8679 Watch this video: about Corneal and Internal Astigmatism in Contact Lens: kzfaq.info/get/bejne/kJqClbOT3LWbYZ8.htmlsi=s5dytXeaCw-dnBfF

@deletedchannel5003 7 ай бұрын

Hi! Quick question, If my contact lenses are -0.65 what would my glasses prescription be?

@optometry-with-samir 7 ай бұрын

Your question is wrong. There is no contact lens having -0.65D power. It will be either -0.50 or -0.75.

@ahnikpurkait7152 11 ай бұрын

in case of contact lenses if i have -.5 cylindrical power and -1.75 spherical power can i use -2 spherical power contact lenses? axis 180

@optometry-with-samir 11 ай бұрын

Your question is not designed correctly.... 5D cylinder power is not possible to correct with any spherical contact lens. You have to try with Toric contact lens

@ahnikpurkait7152 11 ай бұрын

@@optometry-with-samir But sir for toric lenses i must have a - 0.75 minimum cylindrical power, whereas i have only - 0.5 cylindrical power and - 1.75 spherical power. So in that case can i not use an equivalent of -2 spherical power and 0 cylindrical powered lens?

@anishaa1136 6 ай бұрын

Yes u can use

@anishaa1136 6 ай бұрын

@ahnikpurkait7152 0.50DC is neglected

@Doctor.TC. 8 ай бұрын

Hi! I’m thinking of buying colored contacts and was wondering what power I would need My right eye: +2.00 sphere, -0.25 cylinder, 175 Axis My left eye: +1.00 sphere, -0.50 cylinder, 160 axis

@optometry-with-samir 8 ай бұрын

RE: +2.0 Sphere LE: +1.0 Spbere

@kshitizaryan8102 4 ай бұрын

For toric can we use spero cylindrical power calculation

@optometry-with-samir 4 ай бұрын

For Toric we have to distribute the power meridian wise then have to calculate the power in both meridian. Then again we have to write it onto Sphero-Cylinder format. Watch the video again

@SomashreeSaha 9 ай бұрын

I have -0.75 sph on both eyes and -1.50 cyl on left eye with 92 axis and -2.50 cyl on right eye with 90 axis. What will be my contact lens powers? Please let me know doc. I can't get this right.

@optometry-with-samir 9 ай бұрын

✓If you go for soft contact lens then you need Toric Soft Contact Lens with power: RE: -0.75 /-2.25 x 90° LE: -0.75 / -1.25 x 90° ✓If you go for RGP (Rigid Gas Permeable) lens then spherical RGP with power -0.75DS may correct your Refractive error but you need go for trial. Note: Ideally, contact lens power should be finalized with trial lenses and needs more data like: Base Curve of Cornea, HVID, pupil size etc. This power conversion is based on theoretical formula and may not suitable for you. Better to consult with an Optometrist.

@SomashreeSaha 9 ай бұрын

@@optometry-with-samir thank you so much for clearing it out for me.

@wakeeljan5565 Жыл бұрын

Well explained

@optometry-with-samir Жыл бұрын

▪️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.

@emadqudomi7689 Жыл бұрын

Its free

@aaliyahcole1100 6 ай бұрын

hey my glasses prescription is right eye - sphere -0.75, cylinder -3.0 , axis 6.0 and left eye is sphere -1.25, cylinder -1.75, axis 159.0 what is my contact lenses prescription

@Mr.420_._._ 5 ай бұрын

Bro for my both the eyes power is -6.50 , what power of contact lens should i use plz tell me 🙏

@user-ok5lu5ci4d 5 ай бұрын

-6.00

@powerspeedutube Ай бұрын

Great video and nicely explained. You also bother to reply to comments! You have a new subscriber, sir! May I ask if AXIS is the same for CL and Glasses?Thank you

@somacynthia9172 6 ай бұрын

My glasses prescription is -7.00 on both eyes what contact lenses do I get?

@optometry-with-samir 6 ай бұрын

-6.50D

@user-ps6oe6ji2e 6 ай бұрын

My glasses power is -2.00 on both side.What power of contact lens should I get? Help

@optometry-with-samir 6 ай бұрын

Same power... Below 4D power there is no need to calculate the contact lens power.

@SalmanKhan-ck7bq 7 ай бұрын

I don't understand. My right eye is -4.5, -1.25 axis is 25. Left eye is -4.5, -1.5 and axis is 170. How can I convert this into SPHERICAL contact lens power?

@samanateeq2868 5 ай бұрын

- 3.5right cyl 0.50 Axis 180 -3.5 left What will be my contact lens power

@MFARIS-sf4wp 2 ай бұрын

6/60 contact lens power please ? reply fast🙏🏻🙏🏻🙏🏻

@rifaniriyas5197 22 күн бұрын

Right eye…sph4.5, cyl -2.5 Axis10 Left eye. …sph 4.5. Cyl-3 Axis 180 Please let me know the power of eye each

@rhodssminivlog2070 2 ай бұрын

Can you solve for me SPH -1.75 CYL- 0.75 SPH - 1.00 CYL - 2.25

@wearetheborg 8 ай бұрын

my doctor said +0.75 glasses equal to +1 contact lense. but i do this math and i get 0.7585 at the end, what did i miss?

@optometry-with-samir 8 ай бұрын

Less than 4 Diopter power there is no need of changing power. You can use +0.75D as contact lens power.

@wearetheborg 8 ай бұрын

@@optometry-with-samir hmm my laser eye surgeon said +0.75 glasse = +1 contact. maybe because for laser eye surgery need different calculation.

@wearetheborg 8 ай бұрын

@@optometry-with-samir in the past i used +0.75 glasse, now i use +1 contact for test it before surgery and i feel its even weaker that my +0.75 glasse, it feels like +0.5 thats why im asking :)

@optometry-with-samir 8 ай бұрын

@@wearetheborg Nope it's same for all.... But whether you wear +0.75 or +1.0 your vision won't be affected. Note: For plus power over correction is recommended... So you can go for +1.0.

@optometry-with-samir 8 ай бұрын

@@wearetheborg Plus power reduce overall brightness that's why it seems vision reduced but that not the case.

@imanajmal2088 5 ай бұрын

Aixs ki smjh ni ae

@optometry-with-samir 5 ай бұрын

Watch the video again... If still not understand watch the video about optical cross: kzfaq.info/get/bejne/iqh_hciJvZauc4k.htmlsi=EajIB1te6vumdXQK

@nishatanjum9603 7 ай бұрын

You had put cylindrical power on wrong axis... It is 90/

@optometry-with-samir 7 ай бұрын

No, You are wrong. If you don't know how to write Sphero-Cylinder power from optical cross, you can watch this video about Optical Cross: kzfaq.info/get/bejne/iqh_hciJvZauc4k.htmlsi=_-kF_VP4G-yC8-k_