SPHERICAL EQUIVALENT Of EYE ||OPTOMETRY

WELCOME TO INSIGHT OPHTHALMOLOGY !
This video is a continuation to the video on sturms conoid It talks about the SPHERICAL EQUIVALENT of the eye. What is meant by SPHERICAL EQUIVALENT OF EYE ?
How to calculate the SPHERICAL EQUIVALENT ?
What is the use of SPHERICAL EQUIVALENT?
Understand SPHERICAL EQUIVALENT using the STURMS conoid.
SPHERICAL EQUIVALENT and circle of least confusion
Astigmatic correction using SPHERICAL EQUIVALENT.
SPHERICAL EQUIVALENT AND CONTACT LENS.
#refraction
#optics
#sphericalequivalent
||LINKS||
||Types of astigmatism ||
• ASTIGMATISM || REGULAR...
||Understanding astigmatic prescription||
• Decoding Your Astigmat...
||Sturms conoid and applications||
• STURMS CONOID || APPLI...
||Spherical equivalent ||
• SPHERICAL EQUIVALENT O...
This channel is run and managed by Dr Amrit Sahil Panjwani (MBBS, MS ophthalmology ). If you finf the videos useful. subscribe, like and share with those to whom it would be useful .
thank you!!

[@InsightOphthalmology]

At 2:08 The diagram is wrong according to the power cross. The horizontal line indeed should be anterior (-4 ) than the vertical line .
At 3:49 it's minus CONCAVE lens

[@sandeepjangra8247]

Yes thats I also thinking।।Why convex

[@drishtiparashar7420]

great 👍 👌

[@mrdino2250]

Best explanation ❤

[@raghavendravathar1565]

Thanku mam, all ur videos are very nice, informative and good learning tool,, you are like dronacharya to many students 😊🙏🙏

[@InsightOphthalmology]

Thank you!

[@CazSity]

Thank you very much

[@manandasarawad5459]

How to know the image formed at horizontal meridean or in vertical meridian clinically

[@aysennnalar4854]

with the rule compounding miyopi is it right?

[@ronak_singh_]

if someone have -2cylender and no spherical correction can we convert it to -1 spherical?

[@InsightOphthalmology]

Well yes that would be the spherical equivalent. But the decision really varies from patient to patient .
There are special indications for using spherical equivalent as prescription and some contraindications as well

[@yelenagigi]

is there a limit for cylinder values above which it is not advisable to give a sph equivalent ?

[@InsightOphthalmology]

It's about 1 D. Beyond that the acceptance is poor

[@yelenagigi]

@@InsightOphthalmology thanks very much for your response and for your excellent content .
Keep up the great work

[@muzafarkhokhar1939]

Mam, if the vengeance power in vertical meridian is 4 diopters, why have you entered it as just 2 diopters in the formula?

[@InsightOphthalmology]

That's a power cross wherein the sphere is the smallest number (between 2 and 4) and the cylinder is the difference between them (-4-(-2) =-2 ).

[@hamnaashraf8218]

The vertical meridian has more power- (-4). In that case, it should produce a horizontal line more anterior right?
The horizontal meridian (-2) should produce a vertical line closer to the retina. Isnt this correct ma'am? Please do clarify. 2:33

[@InsightOphthalmology]

Yes you are correct ! The diagram is wrong according to the power cross. The horizontal line indeed should be anterior (-4 ) than the vertical line(-2).

[@m.kahmed6963]

Why you show vertical focal line at front and horizontal focal line at back, in schematic eye, as they are reverse as you told in strum coniod

[@InsightOphthalmology]

I have assumed that horizontal meridian is more steep than vertical
Therefore js is focussed in front

[@m.kahmed6963]

@@InsightOphthalmology thanks alot

[@sannikmukherjee0]

If spherical power is 0 D and cylinder power is -1.50 dcyl ×90° ,what is spherical equivalent

[@InsightOphthalmology]

-0. 75 D spherical

[@marypegu6646]

Why minus convex lens

[@InsightOphthalmology]

It's a minus concave lens.

[@khanoptician9897]

Concave lense ya convex lense plz make it clear plz

[@InsightOphthalmology]

Thank you for pointing out the error. It's a minus "concave" lens.

[@DeepakGupta-fv4uf]

Its Concave lens. Mam आप bol सही रहे थे पर diagram convex lens ka ban gaya tha.

[@dr.nikhilaiimsdelhi9410]

Very informative video