OD Sph = -7.00
OD Cyl = -3.00
OD Axis = 30
OS Sph = -4.00
OS Cyl = 0
OS Axis = 0
Reading Level Distance(mm) = 10.0
On OptiCampus calculator http://opticampus.opti.vision/tools/vertical.php above input gives the answer:
Prism Compensation (Δ): 5.51, Base Up in RIGHT Eye
But when I manually calculate with below formula:
(ReadingLevelinCM * (odSph + (odCyl * sq (sin (odAxis-90))))) - (ReadingLevelinCM * (osSph + (osCyl * sq (sin (osAxis-90)))))
I get 5.25 Diopter prism.
What is the mistake in my formula?
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