Spherical Equivalent

An easy to understand explanation with examples of the definition, calculation and significance of the spherical equivalent of a toric prescription

[@drneelshah0032]

Excellent explanation ma’am

[@hemavathyshankar8345]

Wow thanks ma'am .. actually was waiting for this topic to get it cleared by someone

[@giokilldagram1233]

Hey would you be able to tell me mine
If my right eye is -8.00 sph and CYL -2.75 axis 20
And my left eye is -6.25 sph and CYL -2.75 axis 160

[@vivekanandavivekananda6566]

very well explained mam 👏
and plz make a video on Near point of accomodation by push up , pushdown and minus lens method

[@hunainfaheem9134]

Great

[@expertphacosurgeon]

very nice 👌

[@ophthalmologypearls]

Thank you Dr Arup 🙏

[@hunainfaheem9134]

Kindly cover the direct ophthalmoscope instrument

[@sannikmukherjee0]

If spherical power 0 dsph and cylinder power -1.50 dcyl , what is the spherical equivalent?

[@ophthalmologypearls]

1. New sphere = alegrebaic sum of sphere & cylinder = 0 + (-1.50) = -1.50
2. New cylinder is numerically same with opposite sign = +1.50
3. Rotate cylinder through 90 0
4. So if prescription is 0 / -1.50 x 180
a. Spherical Equivalent → -1.50 / +1.50 x 90
5. If prescription is 0 / -1.50 x 90
a. Spherical equivalent →-1.50 / +1.50 x 180

[@sannikmukherjee0]

@@ophthalmologypearls thanks

[@alexlagogiannis3682]

That is not correct,this is true if you want to change the -/+ sign of the prescription.the correct SE is -0,75sph

[@sannikmukherjee0]

@@alexlagogiannis3682 please explain

[@ronak_singh_]

Hey can you tell me
-0.5sp,-1.5cy/180(both eyes)
So the sperical correction is -1.25?
Am i right?

[@ophthalmologypearls]

Yes

[@ronak_singh_]

@@ophthalmologypearls so mam does it also mean if i have -1 cy only it will work as -0.5 spherical?

[@ophthalmologypearls]

The spherical equivalent is -0.5 D

[@shamishamu5986]

Can you share DHA optometry syllabus and mcq & answers

[@ophthalmologypearls]

Sorry I am not familiar with optometry syllabi