How Do You Measure A Lens Magnification?
Optical lenses are measured in power called Diopter. The power of a lens magnification can be measured on a piece of optical equipment called a lensometer. Most basic magnifying lenses are designed in simple spherical power, which means there is just one power measurement in the lens. But some magnifying lenses have complex curves and power. Care must be taken to ensure you are using a lensometer correctly to measure magnification in a lens. Place the lens on the platform of the lensometer and secure it in place with the lens stop. Look through the eyepiece. Adjust the power wheel on the side of the lensometer, until the optical center comes into focus. You will see a cross inside the eyepiece. If both the thin horizontal and thick vertical lines of the cross come into focus at the same time, the lens has basic magnification, called spherical power. Note the power on the power wheel. Diopter power is measured in .25 steps from 0.00 to 20.00. In lenses that magnify, the power is called
