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.
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.
Thank you for making such kind of videos which are easy to understand😊… I am an optometrist I am watching all videos which are uploaded on your channel and it’s very helpful for me, I would request you to please make videos on all about Dispensing Optometry and Role of Dispensing Optometrist because I didn’t found more videos on YT and you will explain it well 😁.
▪️I am going to start Dispensing Series Soon. ▪️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.
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.
▪️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.
In extented keratometer , càn we add & reduce , +9. _6 directly from what we get the keratometer value? Is it correct or wrong sir. Then how did we get that constant value 1.185 & 0.840. can you explain sir
We can't directly add or reduce +9 or -6 from actual keratometer. Try understand this... The mires size we use in keratometer is fixed. So when we use a plus lens it will magnify the image of mires. In keratometer this calculation is done automatically by using the formula r= 2i/o. Now, as o or object size is fixed and i or image size is magnified the r or radius of curvature will more than the normal value. Now, when we get the radius of curvature from keratometer, dioptric power of Cornea is identify using the formula: N1 - N2/r. N1 or Refractive index of keratometer is fixed that is 1.3375 and N2 is refractive index air that is 1.00. So, ultimate formula becomes, 1.3375 -1.00/r or 0.3375/r. Now, as value of r is higher than the normal because of using a +1.25 lens so dioptric power of Cornea becomes less than the normal value. It is found that if we multiply the reading by 1.185 when we use +1.25 lens we get actual dioptric power Cornea.
Thank you so much forsuch a great video you had done.....really its very very helpful to me......very easy to understand sir....tq once again sir
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.
Very concise and great teaching❤
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.
Thank you for making such kind of videos which are easy to understand😊… I am an optometrist I am watching all videos which are uploaded on your channel and it’s very helpful for me, I would request you to please make videos on all about Dispensing Optometry and Role of Dispensing Optometrist because I didn’t found more videos on YT and you will explain it well 😁.
▪️I am going to start Dispensing Series Soon.
▪️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.
Sir দারুন হয়েছে।
Sir বাংলায় একটা চ্যানেল করুন।
Very nice explanation
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.
Thnkk uuu sirjii❤❤
▪️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.
Please sir, why will you get 48D after adding +1.25D to 52D and How will you get 36 after adding -1.00D to 36D?
n1= refractive index of cornea? or keratometer
Refractive index of Keratometer not cornea.
Thank you,
Samir Sutradhar
I love your voice xoxoxoxo
Thank you....🙃
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In extented keratometer , càn we add & reduce , +9. _6 directly from what we get the keratometer value? Is it correct or wrong sir. Then how did we get that constant value 1.185 & 0.840. can you explain sir
We can't directly add or reduce +9 or -6 from actual keratometer.
Try understand this...
The mires size we use in keratometer is fixed. So when we use a plus lens it will magnify the image of mires.
In keratometer this calculation is done automatically by using the formula r= 2i/o.
Now, as o or object size is fixed and i or image size is magnified the r or radius of curvature will more than the normal value.
Now, when we get the radius of curvature from keratometer, dioptric power of Cornea is identify using the formula: N1 - N2/r.
N1 or Refractive index of keratometer is fixed that is 1.3375 and N2 is refractive index air that is 1.00. So, ultimate formula becomes, 1.3375 -1.00/r or 0.3375/r.
Now, as value of r is higher than the normal because of using a +1.25 lens so dioptric power of Cornea becomes less than the normal value.
It is found that if we multiply the reading by 1.185 when we use +1.25 lens we get actual dioptric power Cornea.
Easily understand about keratometer
Go ahead
Thank you for your compliments.