Plus To Minus CYL Calculator


In today’s technological era, calculators have become an indispensable tool for various calculations. Whether it’s simple arithmetic or complex mathematical equations, calculators simplify the process and provide accurate results efficiently. In this article, we’ll introduce a calculator designed specifically for the calculation of plus to minus cylinder values in ophthalmology.

How to Use

Using the plus to minus cylinder calculator is straightforward. Enter the required values into the designated input fields and click on the “Calculate” button to obtain the result.


The formula used for converting a plus cylinder to a minus cylinder (or vice versa) in ophthalmology is:


  • Mnew​ is the new spherical power
  • Mold​ is the old spherical power
  • Cold​ is the old cylindrical power
  • The sign (plus or minus) depends on whether the conversion is from plus to minus or vice versa.

Example Solve

Let’s consider an example where we need to convert a prescription from plus cylinder to minus cylinder:

  • Old prescription: +2.00 DS / -1.50 DC x 90

Using the formula mentioned above:

So, the new prescription would be +3.50 DS.


Q: Can this calculator be used for converting minus cylinder to plus cylinder?
A: Yes, the calculator can handle both conversions effectively.

Q: Is this calculator suitable for all ophthalmic calculations?
A: No, this calculator is specifically designed for plus to minus cylinder conversions.

Q: Can I use this calculator for astigmatism calculations?
A: While it can handle cylindrical power conversions, it’s recommended to consult with an ophthalmologist for precise astigmatism calculations.


In conclusion, the plus to minus cylinder calculator serves as a valuable tool for ophthalmologists and optometrists, simplifying the process of converting prescriptions between different cylinder formats. With its user-friendly interface and accurate calculations, it enhances efficiency in the field of vision correction.

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