Fantastic Magnifying Glasses! MICRODISSECTION, MICROSURGERY urgical loupes help to alleviate eye strain by enlarging the image when you are working on tiny subjects or conducting precision operations. They are portable and easier to use than a surgical microscope. However, they are not created equal, and choosing the pair that’s right for you is important to your satisfaction. S Choosing loupes Choosing the correct surgical loupes for your application involves several factors, including resolution, working distance, field of view, depth of field, magnification, weight and interpupillary distance. These terms are defined below. Ideally, you want the lowest magnification that is suitable for your application. As a general rule, the lower the magnification, the greater the depth of field and field of vision. Likewise, the longer the working distance, the greater the field of view. The larger your field of view, the less you need to turn your head. This reduces eye strain and fatigue. It is also important to consider the weight and fit of your loupes. Lightweight loupes are more comfortable for longer periods of use, and they are less likely to slide down your nose as you work. WPI loupes have adjustable interpupillary distance for a correct fit every time. Three styles of loupes are available today. The first is a single lens loupe for simple, low-magnification applications. A photographer or jeweler might use this style. The second style is the Galilean loupe designed by the 17th-century astronomer Galileo Galilei. Galilean loupes use multiple lenses and offer magnification between 2.0x and 3.0x. These are easy to use, lightweight and affordable. For greater magnification up to about 8.0x, prismatic loupes (Keplerian) are available. Designed by Johannes Kepler, prismatic loupes use a series of lenses and prisms to magnify the subject. They offer greater magnification, sharp resolution and a greater depth of field. Your Height <5'7" (170cm) 5'7"-6'4" (170-193cm) >6'4"(193cm) WD WD (when sitting) (when standing) 34cm (14") 42cm (16") 50cm (20") 42cm (16") 50cm (20") 55cm (22") Things to Consider Resolution Resolution determines the amount of fine details that can be distinguished. The type of glass used in the lenses and coatings applied to it can affect the resolution of your loupe. To test a set of loupes, look through them at a piece of graph paper. Notice color distortions or curvature of the lines. A high resolution loupe will have crisp, straight lines. The lines, seen through lower quality lenses, will be slightly blurred and curved. 504038 — 2.5x Binocular Loupe 30 World Precision Instruments UK: Tel: +44 (0)1462 424700 • wpiuk@wpi-europe.com www.wpiinc.com Germany: Tel: +49 (0)30-6188845 • wpide@wpi-europe.com US: Tel: 941-371-1003 • sales@wpiinc.com