This goggle model loupes can only be used by person with normal vision. If you are a beginner to use loupes, we recommend you to choose magnification 2.5X, because lower magnification loupes have bigger field of view, so loupes focus easy. The pupillary distance can be adjusted by one center axis,it is very simple and convenient for user. This kind of loupes is widely used for many microsurgery,operations of dentistry,nerve and heart disease etc...and also the loupe is widely used for the eletronical industry,precise manufacture,textile facture and researcher or engineer who require the precise observation in Optical Magnification. loupes have 4 kinds of working distance : S(280 - 380 mm), R(360 - 460 mm), L(440 - 540 mm), XL(500 - 600 mm).How To Choose Your Loupes Determine your working distance, which will also automatically determine your field of view. While working on a friend or family member have someone measure the distance from your eyes to your patient's : this is you working distance.Choose the distance that is closest to the selection we offer.If you are dentist , your height is in the range from 160cm to 180CM,we recommend R(360-460mm) working distance.If you're surgeon, you are sitting while working, your height is from 160cm to180cm, we recommend working distance R (360-460mm ). IF you are standing while working, your height is from 170cm to 180cm, we recommend L (440-540mm) working distance, even XL(500-600mm) working distance will be suitable.

• Is Discontinued By Manufacturer ‏ : ‎ No
• Product Dimensions ‏ : ‎ 9.06 x 5.12 x 6.3 inches; 2.01 ounces
• Date First Available ‏ : ‎ October 9, 2012
• Manufacturer ‏ : ‎ Songzi Optical Co.,Ltd
• Country of Origin ‏ : ‎ USA