The field of view decreases as the power increases. More powerful lenses make small details look big, but less of the total object is visible. There is a trade-off for the viewer who must decide between the size of the field of view, and the amount of magnification . The distance that a magnifier can be moved from an object, and still have the object in focus, is the depth of field. With depth of field, the higher the power, the shorter the depth of field.
Proper lighting is equally as important as magnification in achieving a good viewing situation.
Increasing light levels results in better vision. The better the quality of light used with a magnifying lens, the less power is needed. This is very desirable, because when less magnification is required, the user has a bigger field of view. The subject of magnification can be confusing. In the months ahead we hope to present more information to make this subject more understandable and to make it easier for you to purchase the right equipment to meet your vision needs.