# How Are Diopters Calculated?

The diopter of a lens can be calculated by dividing the number 40 by the focal length (in inches) of a lens. Once the diopter number is known, other parameters such as magnification power and total power can be calculated. Magnification power is a measure of how much larger an object is after magnification.

## How to calculate the diopter of a lens?

For example, if a lens has diopter +2, its focal length is 1000/2=500mm, and a lens of +4 diopter has focal length 1000/4 = 250mm. In this way, you can easily calculate the diopter of a lens from its focal length, and the focal length of a close-up lens from its diopter value.

## Where can I find out the strength of my diopter?

The easiest way to find out the diopter strength you need is to visit a drug store, department store or other retail outlet that sells cheap reading glasses, and try on a few different strengths.

Instructions: 1 Take off your glasses. 2 Use the instructions to find where the text on the screen just barely starts to blur. 3 Measure the distance from your eyes to the screen at this “blur-distance”. 4 Enter your current diopters (optional). 5 Enter the ‘blur-distance’.

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