Calculation of Snellen's Letter size

#optometry #snellenchart #snellenlettersize
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[@conanr.1138]

Thank u , i have 2 questions one :Explain mathematically why the human eye can distinguish the largest letter of Snellen chart from a distance of 60m specifically? 2: how to prove that the mar =1 min arc mathematically ?

[@Siva-nj8vk]

Nice explanation, this is for 6/60 , for (6 meter chart) please tell me how to do for 3 meter chart for 3/60, 3/36..and all.

[@Deepak-INDIA]

Thanks for formula bro ❤

[@optometry-with-samir]

You are right. 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.

[@jali7776]

thank you sir for the vid. sir may i ask you about how to correlation between snellen fraction and spherical /cyl correction? how to calculate it?

[@optometry-with-samir]

There is no specific formula as far as I know. On an average -0.50DS is equivalent to each line in Snellen Chart. Hyperopic patient can read 6/6 line even with +3 to +4D hypermetropia depending upon amplitude of accommodation.

[@user-vk3gw4pf2f]

Thanks for the great video! How does this change for creating the optotype size when using a 10 feet chart? eg 10/10, 10/40, 10/60 etc

[@optometry-with-samir]

Convert the Denominator in meter then use the formula..

[@user-vk3gw4pf2f]

Thank you! Can this also be used for a near visual acuity snellen chart?

[@optometry-with-samir]

Yeah, You can use this for Snellen Near Visual Acuity Chart.

[@andya1408]

​@@optometry-with-samir Great video! I just subscribed to your channel! How would the use formula for a near snellen visual acuity chart? What would be the new D values, because the distance and near snellen charts are written in the same format? but the card is help at 40cm

[@optometry-with-samir]

@@andya1408 Convert 40 cm in meter in try this formula

[@andya1408]

@@optometry-with-samir But how would you apply the D values to all of the different near VA values? eg for N8, N6, N10, N12 etc?

[@optometry-with-samir]

@@andya1408 This formula is for Snellen Near Visual Acuity Chart not for Roman font letter size...

[@chizzy-y7s]

Where did the 18.288 cooke from

[@optometry-with-samir]

@@chizzy-y7s For the Formula we need meter but in the example it was in Feet. 60 feet equal to 18.288 meter

[@shashidev1596]

Request to reply what is starting salary after diploma optometry without BSc optometry in Patna AIIMS and PMCH

[@optometry-with-samir]

We don't have any idea. We Will come back to you if we get any info regarding this.