1. What is Plus To Minus Prescription?

The Plus To Minus Prescription conversion is used to transpose a plus prescription to its minus equivalent. This is commonly needed in optometry and ophthalmology when converting between different types of lens prescriptions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( plus\_rx \) — Original plus prescription
• \( Minus\_rx \) — Converted minus prescription

Explanation: The transposition process involves mathematical conversion of the lens power values.

3. Importance of Prescription Conversion

Details: Accurate prescription conversion is crucial for proper lens manufacturing and ensuring correct vision correction.

4. Using the Calculator

Tips: Enter the plus prescription in the correct format. The calculator will provide the equivalent minus prescription.

5. Frequently Asked Questions (FAQ)

Q1: Why convert between plus and minus prescriptions?
A: Different lens types and manufacturing processes may require prescriptions in specific formats.

Q2: Is the conversion always exact?
A: While mathematically precise, final lens performance may require additional adjustments.

Q3: Can I use this for contact lens prescriptions?
A: Contact lens conversions may require additional parameters like base curve.

Q4: What about astigmatism corrections?
A: The calculator handles spherical and cylindrical components appropriately.

Q5: Should I verify with an eye care professional?
A: Always consult with an optometrist or ophthalmologist for final prescription validation.