LogMAR Visual Acuity Chart - A complete Tutorial
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- เผยแพร่เมื่อ 29 ก.ย. 2024
- #optometry #logmarchart #ophthalmology #Eye #smartoptometry #ChandigarhUniversity #OptometryStudent
AFTER WATCHING THIS VIDEO YOU WILL ABLE TO KNOW:
- Log MAR Charts - History
- For which kind of patients, is LogMAR chart particularly more useful in recording visual acuity?
- Features of the logMAR visual Acuity charts.
- Log Mar Charts Available Today…
- Advantages of using LogMAR Charts
- lea symbol chart
- Prerequisite Conditions needed for using LogMAR Charts
- Room Criteria needed for using LogMAR Charts Test
- Preparing the Patient for Visual Acuity Measurement.
- Procedure of Testing Visual Acuity for distance and Near
- Documenting the Visual acuity measurement using LogMAR Chart.
- Converting Snellen’s VA to logMAR Score.
- The Formula use in LogMAR Chart.
- Conversion Chart used for reference.
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i hope all the optometry students in the world watch your video. this is truly wonderfully made! thank you!
It really motivates us.
Stay with us, we will continue this way.
Thank you,
Team Smart Optometry.
Good representation and graphics
It really motivates us. Stay with us for more Presentation.
Thank you,
Team Smart Optometry.
Well explained
Thank you,
Team Smart Optometry
Thank you for your nice presentation.
Quiz answer is:
B. Logarithm of Minimum Angle of Resolution.
Thank you,
Team Smart Optometry
Very organized and useful. Thank you
Stay with us for more tutorials.
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Team Smart Optometry
B
Mam can you please answer me why logmar is measured at 4m
✓In logMAR chart, letters are designed so that they subtend an angle of 5min arc at 4m distance.
✓ In snellen Chart, letters are designed to subtend an angle of 5min of arc at 6m distance.
✓ if letters subtend in less than 5min of Arc our eyes will not able to differentiate two objects separately.
Thank you,
This is Samir from"Team Smart optometry"
smart optometry thankyou so much for reply ❤️
Landolt C chart next Viedio, please
Soon I will prepare a video on Landolt C chart ....
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251123
Very useful video 👍👍
You are right.
Stay with us and share with your friends.
Thank you,
Samir Sutradhar.
Thank you so much you helped me alot super greatfull❤❤❤❤
Stay with us and share with your friends.
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Team Smart Optometry.
This was amazing and understandable
Stay with us. Check our other videos..
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Plzz. Upload keratconus video
Thank you for your suggestions. We will try our best to prepare video on keratoconus.
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Sir aap please ek video orthotics par bhi banao
Thank you for your suggestion. I will try to prepare videos on Orthoptics.
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Have a question..
What changes will be on vision while we decrease the distance bw the chart and the pt?
Chart's letters are designed to see from a specific distance. If any patient (low vision patient) is not able to see any letter then we can take the chart closer to patient but for that we need to add 0.3 for each meter with the patient logMAR score .
Can you please share something about LogMar tested at 3 mtrs and 1.5 mtrs
Normally we do LogMAR at 4m distance. If we reduce the distance for every 1M change we have to add 0.3 with the final Visual Acuity.
Like:
Log mar VA = Log Mar Score + 0.02(missing optotypes) + 0.3( for every 1metre change)
Thank you,
Samir Sutradhar.
@@optometry-with-samir thanks for the reply
But can you please explain this 3mtrs and 1.5 mtrs like you have explained in the video.
For 4 meter the formula is:
Log mar VA = Log Mar Score + 0.02(missing optotypes)
Now if we perform the test at 3m, then Formula will be:
Log mar VA = Log Mar Score + 0.02(missing optotypes) + 0.3
Generally We reduce distance in 1m step like, 4m, 3m, 2m, 1m not like 3.5m, 2.5m, 1.5m.
Thank you,
Samir Sutradhar.
@@optometry-with-samir Thanks alot for this😊
@@optometry-with-samir but in clinical practice we mostly write the prescription in form of snellen like VA ( R6/12 L6/6
b
You are right.
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7:39
How can you explain this??!!
1.7 log 10=0.23 logMAR !!
You can use calculator to find value of Log 1.7 or you can use log value table.
@@optometry-with-samir
Aha!
I wrote this (1.7 log 10) in the calculator and the result was 1.7! It considered log10 equals 1,and multiplied 1.7×1
@@optometry-with-samir Hello. When using the calculator the result of 1.7log10 is 1.7 and not 0.23. Can I ask how to get 0.23 as the answer on the calculator? Thank you
can you make case based videos. amazing videos.
We will try to prepare video on case based.
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If a patient reads the 0.9 line on the logmar chart from a distance of 1m. But he also reads 3 letters of 0.8 line. His final acuity will be?? ......please answer must
LigMAR score 1.74
Procedure to solve....... please
Identify LogMar score using formula in the video. Then add 0.9 with the logMar score.
We have to add 0.9 because test is performed from 1 m.
General this is performed from 4m. As we reduced distance from 4m to 1m (3 meter reduction) we have to add 0.3 X 3 = 0.9 ( 0.3 for each meter reduction.
Thank you,
Samir Sutradhar.
Thank you soo much💫
I think right answer is 1.44 logmar
Testing distance is 3cm Or 4cm mam?
Standard distance is 4meter. But depending upon the patient eyes condition we can decrease the distance. But if you decrease the distance you have to add 0.3 for each meter.
Thank you,
Samir Sutradhar
Team Smart Optometry.
@@optometry-with-samir 0.3 will be constant? I think It will not be constant
Sir can you please make video from where 0.3 has came i mean the calculation
@@Gunjan1998
0.3 will be constant, you just have to add distance in meter. Like:
For 1 meter reduction of distance: 0.3 x 1
For 2 meter reduction: 0.3 x 2
For 3 meter reduction: 0.3 x 3
@@optometry-with-samir 😃🙏yes so it means we have to add 0.3 if we reduce our distance from 4m to 2m and for 1m we will add 0.6 and for 50cm 0.9
Is it🙏as we reduce the distance exactly half like from 4m to 2m
2m to 1m
1m to 50cm
Thx u mam
Very informative
Thank you,
Team Smart Optometry