https://www.calculatorsoup.com - Online Calculators. Add the sphere and cylinder values to obtain the new sphere power: +1.00 - 2.00 = -1.00 Step 2. A Spherical Equivalent is a set of two numbers, one value for each eye, that gives you an estimate of your eyes' refractive error. 3 0 obj These cookies do not store any personal information. Enter the Rx* and. I always find it interesting that the general public will call a plus lens a magnifying lens, but they never call a minus lens a minifying lens. This is what lenses do. They either magnify or minify the image viewed when a person holds a lens away from their face to view an object.. If the original axis is less than or equal to 90 degrees then add 90. Slide 21 Cylinder Calculator Choose a Calculation radius r = height h = Let pi = Units Significant Figures Answer: radius r = height h = volume V = lateral surface area L = top surface area T = base surface area B = total surface area A = In Terms of Pi volume V = lateral surface area L = top surface area T = base surface area B = total surface area A = Convert plus cylinder to minus cylinder calculator Remember: plus cylinder power is additive: + - (+) = + Rx: + + x To convert to minus cylinder format, add the cylinder power to the sphere power, change the cylinder power sign from + to - and change the axis by 90 degrees. z9wf[[:$I More calculator widgets Knowledge base Knowledge base into . CALCONIC_ Calculator Rules 3. D(.%/# u cnM/,W2..Y_7gw7[&{-?3N3`[==:q1Tz{1|_ %kM\qi2!Tlw;Bf2fkYM>r6 MX n3kGz=[==B0FX'+tG,}/Hh8mW2p[AiAN#8$X?AKHI{!7. Rest assured this conversion does not alter the type or quality of the vision correction that your doctor prescribed you. flagFlag as inappropriate. V = volume Step 1 = combine the sphere and cylinder power mathematically step 2 = change the sign of the cylinder step 3 = change the axis by 90 degrees 1. This can be done in 3 steps. Figure 1. Rotate the axis of the streak and look at the reflex in different meridians. Sit at arms length from the phoropter. meridians of the lens.
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